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Rong Q, Xi Z, Guo D, Xu W, Zhang L, Wu Q. Regulation of ubiquitination and antiviral activity of Cactin by deubiquitinase Usp14 in Drosophila. J Virol 2024; 98:e0017724. [PMID: 38563731 PMCID: PMC11092352 DOI: 10.1128/jvi.00177-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 03/10/2024] [Indexed: 04/04/2024] Open
Abstract
Cactin, a highly conserved protein, plays a crucial role in various physiological processes in eukaryotes, including innate immunity. Recently, the function of Cactin in the innate immunity of Drosophila has been explored, revealing that Cactin regulates a non-canonical signaling pathway associated with the Toll and Imd pathways via the Cactin-Deaf1 axis. In addition, Cactin exhibits specific antiviral activity against the Drosophila C virus (DCV) in Drosophila, with an unknown mechanism. During DCV infection, it has been confirmed that the protein level and antiviral activity of Cactin are regulated by ubiquitination. However, the precise ubiquitination and deubiquitination mechanisms of Cactin in Drosophila remain unexplored. In this study, we identified ubiquitin-specific protease 14 (Usp14) as a major deubiquitinase for Cactin through comprehensive deubiquitinase screening. Our results demonstrate that Usp14 interacts with the C_Cactus domain of Cactin via its USP domain. Usp14 efficiently removes K48- and K63-linked polyubiquitin chains from Cactin, thereby preventing its degradation through the ubiquitin-proteasome pathway. Usp14 significantly inhibits DCV replication in Drosophila cells by stabilizing Cactin. Moreover, Usp14-deficient fruit flies exhibit increased susceptibility to DCV infection compared to wild-type flies. Collectively, our findings reveal the regulation of ubiquitination and antiviral activity of Cactin by the deubiquitinase Usp14, providing valuable insights into the modulation of Cactin-mediated antiviral activity in Drosophila.IMPORTANCEViral infections pose a severe threat to human health, marked by high pathogenicity and mortality rates. Innate antiviral pathways, such as Toll, Imd, and JAK-STAT, are generally conserved across insects and mammals. Recently, the multi-functionality of Cactin in innate immunity has been identified in Drosophila. In addition to regulating a non-canonical signaling pathway through the Cactin-Deaf1 axis, Cactin exhibits specialized antiviral activity against the Drosophila C virus (DCV) with an unknown mechanism. A previous study emphasized the significance of the Cactin level, regulated by the ubiquitin-proteasome pathway, in modulating antiviral signaling. However, the regulatory mechanisms governing Cactin remain unexplored. In this study, we demonstrate that Usp14 stabilizes Cactin by preventing its ubiquitination and subsequent degradation. Furthermore, Usp14 plays a crucial role in regulating the antiviral function mediated by Cactin. Therefore, our findings elucidate the regulatory mechanism of Cactin in Drosophila, offering a potential target for the prevention and treatment of viral infections.
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Affiliation(s)
- Qiqi Rong
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
- Key Laboratory of Anhui Province for Emerging and Reemerging Infectious Diseases, University of Science and Technology of China, Hefei, China
| | - Zhichong Xi
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Dongyang Guo
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
- Key Laboratory of Anhui Province for Emerging and Reemerging Infectious Diseases, University of Science and Technology of China, Hefei, China
| | - Wen Xu
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
- Anhui Provincial Key Laboratory of Precision Pharmaceutical Preparations and Clinical Pharmacy, Hefei, Anhui, China
| | - Liqin Zhang
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
- Department of Immunology and Pathogen Biology, School of Basic Medical Sciences, Hangzhou Normal University, Hangzhou, China
| | - Qingfa Wu
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
- Division of Molecular Medicine, CAS Key Laboratory of Innate Immunity and Chronic Disease, University of Science and Technology of China, Hefei, Anhui, China
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2
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Zhang R, Li L, Li H, Bai H, Suo Y, Cui J, Wang Y. Ginsenoside 20(S)-Rg3 reduces KIF20A expression and promotes CDC25A proteasomal degradation in epithelial ovarian cancer. J Ginseng Res 2024; 48:40-51. [PMID: 38223825 PMCID: PMC10785255 DOI: 10.1016/j.jgr.2023.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 06/15/2023] [Accepted: 06/25/2023] [Indexed: 01/16/2024] Open
Abstract
Background Ginsenoside 20(S)-Rg3 shows promising tumor-suppressive effects in ovarian cancer via inhibiting NF-κB signaling. This study aimed to explore the downstream tumor suppressive mechanisms of ginsenoside Rg3 via this signaling pathway. Materials and methods A systematical screening was applied to examine the expression profile of 41 kinesin family member genes in ovarian cancer. The regulatory effect of ginsenoside Rg3 on KIF20A expression was studied. In addition, we explored interacting proteins of KIF20A and their molecular regulations in ovarian cancer. RNA-seq data from The Cancer Genome Atlas (TCGA) was used for bioinformatic analysis. Epithelial ovarian cancer cell lines SKOV3 and A2780 were used as in vitro and in vivo cell models. Commercial human ovarian cancer tissue arrays were used for immunohistochemistry staining. Results KIF20A is a biomarker of poor prognosis among the kinesin genes. It promotes ovarian cancer cell growth in vitro and in vivo. Ginsenoside Rg3 can suppress the transcription of KIF20A. GST pull-down and co-immunoprecipitation (IP) assays confirmed that KIF20A physically interacts with BTRC (β-TrCP1), a substrate recognition subunit for SCFβ-TrCP E3 ubiquitin ligase. In vitro ubiquitination and cycloheximide (CHX) chase assays showed that via interacting with BTRC, KIF20A reduces BTRC-mediated CDC25A poly-ubiquitination and enhances its stability. Ginsenoside Rg3 treatment partly abrogates KIF20A overexpression-induced CDC25A upregulation. Conclusion This study revealed a novel anti-tumor mechanism of ginsenoside Rg3. It can inhibit KIF20A transcription and promote CDC25A proteasomal degradation in epithelial ovarian cancer.
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Affiliation(s)
- Rong Zhang
- Department of Gynecology and Obstetrics, Tianjin Medical University General Hospital, Tianjin, China
- Tianjin Key Laboratory of Female Reproductive Health and Eugenics, Tianjin Medical University General Hospital, Tianjin, China
- Department of Gynecology and Obstetrics, People's Hospital of Shanxi Province, Taiyuan, China
| | - Lei Li
- Department of Radiotherapy, People's Hospital of Shanxi Province, Taiyuan, China
| | - Huihui Li
- Department of Gynecology and Obstetrics, Tianjin Medical University General Hospital, Tianjin, China
- Tianjin Key Laboratory of Female Reproductive Health and Eugenics, Tianjin Medical University General Hospital, Tianjin, China
| | - Hansong Bai
- Sichuan Cancer Hospital Institute, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Yuping Suo
- Department of Gynecology and Obstetrics, People's Hospital of Shanxi Province, Taiyuan, China
| | - Ju Cui
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Science, Beijing Hospital/National Center of Gerontology of National Health Commission, Beijing, China
| | - Yingmei Wang
- Department of Gynecology and Obstetrics, Tianjin Medical University General Hospital, Tianjin, China
- Tianjin Key Laboratory of Female Reproductive Health and Eugenics, Tianjin Medical University General Hospital, Tianjin, China
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3
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Zhang C, Pan G, Qin JJ. Role of F-box proteins in human upper gastrointestinal tumors. Biochim Biophys Acta Rev Cancer 2024; 1879:189035. [PMID: 38049014 DOI: 10.1016/j.bbcan.2023.189035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 11/22/2023] [Accepted: 11/25/2023] [Indexed: 12/06/2023]
Abstract
Protein ubiquitination and degradation is an essential physiological process in almost all organisms. As the key participants in this process, the E3 ubiquitin ligases have been widely studied and recognized. F-box proteins, a crucial component of E3 ubiquitin ligases that regulates diverse biological functions, including cell differentiation, proliferation, migration, and apoptosis by facilitating the degradation of substrate proteins. Currently, there is an increasing focus on studying the role of F-box proteins in cancer. In this review, we present a comprehensive overview of the significant contributions of F-box proteins to the development of upper gastrointestinal tumors, highlighting their dual roles as both carcinogens and tumor suppressors. We delve into the molecular mechanisms underlying the involvement of F-box proteins in upper gastrointestinal tumors, exploring their interactions with specific substrates and their cross-talks with other key signaling pathways. Furthermore, we discuss the implications of F-box proteins in radiotherapy resistance in the upper gastrointestinal tract, emphasizing their potential as clinical therapeutic and prognostic targets. Overall, this review provides an up-to-date understanding of the intricate involvement of F-box proteins in human upper gastrointestinal tumors, offering valuable insights for the identification of prognostic markers and the development of targeted therapeutic strategies.
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Affiliation(s)
- Che Zhang
- School of Molecular Medicine, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; Zhejiang Cancer Hospital, Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou 310022, China; Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Guangzhao Pan
- Zhejiang Cancer Hospital, Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou 310022, China
| | - Jiang-Jiang Qin
- School of Molecular Medicine, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; Zhejiang Cancer Hospital, Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou 310022, China; Key Laboratory of Prevention, Diagnosis and Therapy of Upper Gastrointestinal Cancer of Zhejiang Province, Hangzhou 310022, China.
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4
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Nair VM, Sabu AS, Hussain A, Kombarakkaran DP, Lakshmi RB, Manna TK. E3-ubiquitin ligase, FBXW7 regulates mitotic progression by targeting BubR1 for ubiquitin-mediated degradation. Cell Mol Life Sci 2023; 80:374. [PMID: 38008853 PMCID: PMC11072012 DOI: 10.1007/s00018-023-05019-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 10/17/2023] [Accepted: 10/26/2023] [Indexed: 11/28/2023]
Abstract
Faithful chromosome segregation requires correct attachment of kinetochores with the spindle microtubules. Erroneously-attached kinetochores recruit proteins to activate Spindle assembly checkpoint (SAC), which senses the errors and signals cells to delay anaphase progression for error correction. Temporal control of the levels of SAC activating-proteins is critical for checkpoint activation and silencing, but its mechanism is not fully understood. Here, we show that E3 ubiquitin ligase, SCF-FBXW7 targets BubR1 for ubiquitin-mediated degradation and thereby controls SAC in human cells. Depletion of FBXW7 results in prolonged metaphase arrest with increased stabilization of BubR1 at kinetochores. Similar kinetochore stabilization is also observed for BubR1-interacting protein, CENP-E. FBXW7 induced ubiquitination of both BubR1 and the BubR1-interacting kinetochore-targeting domain of CENP-E, but CENP-E domain degradation is dependent on BubR1. Interestingly, Cdk1 inhibition disrupts FBXW7-mediated BubR1 targeting and further, phospho-resistant mutation of Cdk1-targeted phosphorylation site, Thr 620 impairs BubR1-FBXW7 interaction and FBXW7-mediated BubR1 ubiquitination, supporting its role as a phosphodegron for FBXW7. The results demonstrate SCF-FBXW7 as a key regulator of spindle assembly checkpoint that controls stability of BubR1 and its associated CENP-E at kinetochores. They also support that upstream Cdk1 specific BubR1 phosphorylation signals the ligase to activate the process.
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Affiliation(s)
- Vishnu M Nair
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Amit Santhu Sabu
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Ahmed Hussain
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Delvin P Kombarakkaran
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - R Bhagya Lakshmi
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Thiruvananthapuram, Kerala, 695551, India
| | - Tapas K Manna
- School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Vithura, Thiruvananthapuram, Kerala, 695551, India.
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5
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Li CM, Zhang J, Wu W, Zhu Z, Li F, Wu D, Wang XJ, Xie CM, Gong JP. FBXO43 increases CCND1 stability to promote hepatocellular carcinoma cell proliferation and migration. Front Oncol 2023; 13:1138348. [PMID: 36937431 PMCID: PMC10020529 DOI: 10.3389/fonc.2023.1138348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 02/21/2023] [Indexed: 03/06/2023] Open
Abstract
Background and Aims Abnormal expression of E3 ubiquitin ligase plays an important role in the development and progression of hepatocellular carcinoma (HCC), although the mechanism has remained elusive. This study aimed to investigate the biological function and potential mechanism of FBXO43 in HCC. Methods FBXO43 expression in tissues and cells were detected by quantitative real-time PCR (qRT-PCR), Western blot, and immunohistochemistry (IHC). The Kaplan-Meier method and Cox regression analysis were used to explore the correlation between the expression level of FBXO43 and the clinical survival. MTT assay, EdU incorporation, colony formation, Transwell, and wound healing assays were performed to evaluate the function of FBXO43 in cell proliferation and migration in vitro. The interaction between FBXO43 and cyclin D1 (CCND1) was assessed by co-immunoprecipitation (Co-IP) assay and in vivo ubiquitination assay. Results We found that FBXO43 was upregulated in HCC patient tissues and positively associated with poor clinicopathological features. Meanwhile, HCC patients with high expression of FBXO43 had shorter overall survival (OS) and disease-free survival (DFS). Furthermore, knockdown of FBXO43 inhibited HCC cell proliferation, migration and epithelial-mesenchymal transition (EMT) in HCC cells. Mechanistically, FBXO43 interacted with CCND1 and promoted its stability by polyubiquitination, leading to HCC cell proliferation, migration and EMT. Functional rescue experiments demonstrated that knockdown of CCND1 blocks FBXO43-mediated cell proliferation and metastasis. Conclusions FBXO43, as an independent prognostic biomarker, promotes HCC cell proliferation, metastasis and EMT by stability of CCND1, which provides a new potential strategy for HCC treatment by targeting FBXO43-CCND1 axis.
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Affiliation(s)
- Chun-Ming Li
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jie Zhang
- Key Laboratory of Hepatobiliary and Pancreatic Surgery, Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Wu Wu
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhu Zhu
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Feng Li
- Department of Hepatobiliary Surgery, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Di Wu
- Key Laboratory of Hepatobiliary and Pancreatic Surgery, Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Xiao-Jun Wang
- Key Laboratory of Hepatobiliary and Pancreatic Surgery, Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
- *Correspondence: Jian-Ping Gong, ; Chuan-Ming Xie, ; ; Xiao-Jun Wang,
| | - Chuan-Ming Xie
- Key Laboratory of Hepatobiliary and Pancreatic Surgery, Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
- *Correspondence: Jian-Ping Gong, ; Chuan-Ming Xie, ; ; Xiao-Jun Wang,
| | - Jian-Ping Gong
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
- *Correspondence: Jian-Ping Gong, ; Chuan-Ming Xie, ; ; Xiao-Jun Wang,
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6
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Thirmanne HN, Wu F, Janssens DH, Swanger J, Diab A, Feldman H, Amezquita RA, Gottardo R, Paddison PJ, Henikoff S, Clurman BE. Global and context-specific transcriptional consequences of oncogenic Fbw7 mutations. eLife 2022; 11:74338. [PMID: 35225231 PMCID: PMC8926403 DOI: 10.7554/elife.74338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 02/16/2022] [Indexed: 11/30/2022] Open
Abstract
The Fbw7 ubiquitin ligase targets many proteins for proteasomal degradation, which include oncogenic transcription factors (TFs) (e.g., c-Myc, c-Jun, and Notch). Fbw7 is a tumor suppressor and tumors often contain mutations in FBXW7, the gene that encodes Fbw7. The complexity of its substrate network has obscured the mechanisms of Fbw7-associated tumorigenesis, yet this understanding is needed for developing therapies. We used an integrated approach employing RNA-Seq and high-resolution mapping (cleavage under target and release using nuclease) of histone modifications and TF occupancy (c-Jun and c-Myc) to examine the combinatorial effects of misregulated Fbw7 substrates in colorectal cancer (CRC) cells with engineered tumor-associated FBXW7 null or missense mutations. Both Fbw7 mutations caused widespread transcriptional changes associated with active chromatin and altered TF occupancy: some were common to both Fbw7 mutant cell lines, whereas others were mutation specific. We identified loci where both Jun and Myc were coregulated by Fbw7, suggesting that substrates may have synergistic effects. One coregulated gene was CIITA, the master regulator of MHC Class II gene expression. Fbw7 loss increased MHC Class II expression and Fbw7 mutations were correlated with increased CIITA expression in TCGA colorectal tumors and cell lines, which may have immunotherapeutic implications for Fbw7-associated cancers. Analogous studies in neural stem cells in which FBXW7 had been acutely deleted closely mirrored the results in CRC cells. Gene set enrichment analyses revealed Fbw7-associated pathways that were conserved across both cell types that may reflect fundamental Fbw7 functions. These analyses provide a framework for understanding normal and neoplastic context-specific Fbw7 functions.
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Affiliation(s)
| | - Feinan Wu
- Genomics and Bioinformatics Resource, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Derek H Janssens
- Basic Science Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Jherek Swanger
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Ahmed Diab
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Heather Feldman
- Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Robert A Amezquita
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Raphael Gottardo
- Vaccine and Infectious Disease Division, University of Washington, Seattle, United States
| | - Patrick J Paddison
- Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Steven Henikoff
- Basic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Bruce E Clurman
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, United States
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7
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Zhang Z, Cui Z, Xie Z, Li C, Xu C, Guo X, Yu J, Chen T, Facchinetti F, Bohnenberger H, Leong TL, Xie Y, Mao X, Zhao J. Deubiquitinase USP5 promotes non-small cell lung cancer cell proliferation by stabilizing cyclin D1. Transl Lung Cancer Res 2021; 10:3995-4011. [PMID: 34858787 PMCID: PMC8577967 DOI: 10.21037/tlcr-21-767] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 10/22/2021] [Indexed: 12/28/2022]
Abstract
Background Cyclin D1 (CCND1) is overexpressed in non-small cell lung cancer (NSCLC) and contributes to its tumorigenesis and progression. Accumulating evidence shows that ubiquitin-specific protease 5 (USP5), an important member of the USP family, acts as a tumor promoter by deubiquitinating and stabilizing oncoproteins. However, neither the mechanism for dysregulated turnover of CCND1 protein nor the association of CCND1 with USP5 in NSCLC is well understood. Methods The association of USP5 with CCND1 in human NSCLC cells and clinical tissues was determined by immunoprecipitation/immunoblotting, immunohistochemistry (IHC), and The Cancer Genome Atlas database analyses. The effect of USP5 knockdown or overexpression on NSCLC cell proliferation in vitro was assessed by Cell Counting Kit-8, flow cytometry-based cell cycle, and colony formation assays. The effect of the USP5 inhibitor EOAI3402143 (G9) on NSCLC proliferation in vitro was analyzed by CCK-8 assay. The effect of G9 on NSCLC xenograft tumor growth was also examined in vivo, using athymic BALB/c nude mice. Results USP5 physically bound to CCND1 and decreased its polyubiquitination level, thereby stabilizing CCND1 protein. This USP5-CCND1 axis promoted NSCLC cell proliferation and colony formation. Further, knockdown of USP5 led to CCND1 degradation and cell cycle arrest in NSCLC cells. Importantly, this tumor-suppressive effect elicited by USP5 knockdown in NSCLC cells was validated in vitro and in vivo through chemical inhibition of USP5 activity using G9. Consistently, G9 downregulated the protein levels of CCND1 in NSCLC cells and xenograft tumor tissues. Also, the expression level of USP5 was positively associated with the protein level of CCND1 in human clinical NSCLC tissues. Conclusions This study has provided the first evidence that CCND1 is a novel substrate of USP5. The USP5-CCND1 axis could be a potential target for the treatment of NSCLC.
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Affiliation(s)
- Zhiwei Zhang
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Zihan Cui
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Zhuolin Xie
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Chang Li
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Chun Xu
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xia Guo
- Department of Pathology, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Jie Yu
- Department of Pathology, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Tengfei Chen
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Francesco Facchinetti
- Université Paris-Saclay, Institut Gustave Roussy, Inserm, Biomarqueurs Prédictifs et Nouvelles, Stratégies Thérapeutiques en Oncologie, Villejuif, France
| | | | - Tracy L Leong
- Department of Respiratory Medicine, Austin Health, Heidelberg, Victoria, Australia
| | - Yufeng Xie
- Department of Oncology, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xinliang Mao
- Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, China.,Guangdong Key Laboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, China
| | - Jun Zhao
- Department of Thoracic Surgery, the First Affiliated Hospital of Soochow University, Suzhou, China
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Palmer MCL, Neudorf NM, Farrell AC, Razi T, Lichtensztejn Z, McManus KJ. The F-box protein, FBXO7 is required to maintain chromosome stability in humans. Hum Mol Genet 2021; 31:1471-1486. [PMID: 34791250 PMCID: PMC9071473 DOI: 10.1093/hmg/ddab330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/06/2021] [Accepted: 11/08/2021] [Indexed: 11/19/2022] Open
Abstract
Despite the high morbidity and mortality rates associated with colorectal cancer (CRC), the aberrant genes and mechanisms driving CRC pathogenesis remain poorly understood. Chromosome instability (CIN), or ongoing changes in chromosome numbers, is a predominant form of genome instability associated with ~85% of CRCs, suggesting it may be a key mechanism driving CRC oncogenesis. CIN enables the acquisition of copy number alterations conferring selective growth, proliferation and survival advantages that promote cellular transformation. Despite these associations, the aberrant genes underlying CIN remain largely unknown. Candidate CIN gene FBXO7 encodes an F-box protein, a subunit of the SKP1-CUL1-FBOX (SCF) complex that confers substrate specificity to the complex and targets proteins for subsequent degradation by the 26S proteasome. Recently, the genes encoding the three core SCF complex members were identified as CIN genes; however, it is unknown whether F-box proteins exhibit similar integral roles in maintaining chromosome stability. Using short- small interfering RNA (siRNA) and long- (CRISPR/Cas9) term approaches, we show that reduced FBXO7 expression induces CIN in various colonic epithelial cell contexts, whereas FBXO7 knockout clones also exhibit hallmarks associated with cellular transformation, namely increased clonogenic and anchorage-independent growth. Collectively, these data demonstrate that FBXO7 is required to maintain genome stability identifying FBXO7 a novel CIN gene whose reduced expression may contribute to CRC development and progression.
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Affiliation(s)
- Michaela C L Palmer
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada.,Department of Biochemistry & Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Nicole M Neudorf
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada.,Department of Biochemistry & Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Ally C Farrell
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada.,Department of Biochemistry & Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Tooba Razi
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada.,Department of Biochemistry & Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Zelda Lichtensztejn
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada.,Department of Biochemistry & Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Kirk J McManus
- CancerCare Manitoba Research Institute, CancerCare Manitoba, Winnipeg, MB, Canada.,Department of Biochemistry & Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
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9
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Meng Y, Qiu L, Zhang S, Han J. The emerging roles of E3 ubiquitin ligases in ovarian cancer chemoresistance. CANCER DRUG RESISTANCE (ALHAMBRA, CALIF.) 2021; 4:365-381. [PMID: 35582023 PMCID: PMC9019267 DOI: 10.20517/cdr.2020.115] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 01/13/2021] [Accepted: 01/18/2021] [Indexed: 12/24/2022]
Abstract
Epithelial cancer of the ovary exhibits the highest mortality rate of all gynecological malignancies in women today, since the disease is often diagnosed in advanced stages. While the treatment of cancer with specific chemical agents or drugs is the favored treatment regimen, chemotherapy resistance greatly impedes successful ovarian cancer chemotherapy. Thus, chemoresistance becomes one of the most critical clinical issues confronted when treating patients with ovarian cancer. Convincing evidence hints that dysregulation of E3 ubiquitin ligases is a key factor in the development and maintenance of ovarian cancer chemoresistance. This review outlines recent advancement in our understanding of the emerging roles of E3 ubiquitin ligases in ovarian cancer chemoresistance. We also highlight currently available inhibitors targeting E3 ligase activities and discuss their potential for clinical applications in treating chemoresistant ovarian cancer patients.
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Affiliation(s)
- Yang Meng
- Research Laboratory of Cancer Epigenetics and Genomics, Department of General Surgery, Frontiers Science Center for Disease-related Molecular Network, Cancer Center and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
- Yang Meng and Lei Qiu equally contributed to this manuscript
| | - Lei Qiu
- Research Laboratory of Cancer Epigenetics and Genomics, Department of General Surgery, Frontiers Science Center for Disease-related Molecular Network, Cancer Center and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
- Yang Meng and Lei Qiu equally contributed to this manuscript
| | - Su Zhang
- Research Laboratory of Cancer Epigenetics and Genomics, Department of General Surgery, Frontiers Science Center for Disease-related Molecular Network, Cancer Center and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Junhong Han
- Research Laboratory of Cancer Epigenetics and Genomics, Department of General Surgery, Frontiers Science Center for Disease-related Molecular Network, Cancer Center and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
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10
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Wirianto M, Yang J, Kim E, Gao S, Paudel KR, Choi JM, Choe J, Gloston GF, Ademoji P, Parakramaweera R, Jin J, Esser KA, Jung SY, Geng YJ, Lee HK, Chen Z, Yoo SH. The GSK-3β-FBXL21 Axis Contributes to Circadian TCAP Degradation and Skeletal Muscle Function. Cell Rep 2021; 32:108140. [PMID: 32937135 PMCID: PMC8299398 DOI: 10.1016/j.celrep.2020.108140] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 01/04/2020] [Accepted: 08/21/2020] [Indexed: 12/19/2022] Open
Abstract
FBXL21 is a clock-controlled E3 ligase modulating circadian periodicity via subcellular-specific CRYPTOCHROME degradation. How FBXL21 regulates tissue-specific circadian physiology and what mechanism operates upstream is poorly understood. Here we report the sarcomere component TCAP as a cytoplasmic substrate of FBXL21. FBXL21 interacts with TCAP in a circadian manner antiphasic to TCAP accumulation in skeletal muscle, and circadian TCAP oscillation is disrupted in Psttm mice with an Fbxl21 hypomorph mutation. GSK-3β phosphorylates FBXL21 and TCAP to activate FBXL21-mediated, phosphodegron-dependent TCAP degradation. GSK-3β inhibition or knockdown diminishes FBXL21-Cul1 complex formation and delays FBXL21-mediated TCAP degradation. Finally, Psttm mice show significant skeletal muscle defects, including impaired fiber size, exercise tolerance, grip strength, and response to glucocorticoid-induced atrophy, in conjunction with cardiac dysfunction. These data highlight a circadian regulatory pathway where a GSK-3β-FBXL21 functional axis controls TCAP degradation via SCF complex formation and regulates skeletal muscle function. Wirianto et al. find that the circadian E3 ligase FBXL21 drives rhythmic degradation of the sarcomeric protein TCAP in skeletal muscle. GSK-3β co-phosphorylates FBXL21 and TCAP and promotes SCF complex formation and phosphodegron-dependent TCAP turnover. Psttm mice, expressing a hypomorphic Fbxl21 mutant, show dysregulated TCAP degradation and impaired muscle function.
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Affiliation(s)
- Marvin Wirianto
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Jiah Yang
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Eunju Kim
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Song Gao
- Department of Internal Medicine, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Keshav Raj Paudel
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Jong Min Choi
- Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Jeehwan Choe
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Gabrielle F Gloston
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Precious Ademoji
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Randika Parakramaweera
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Jianping Jin
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Karyn A Esser
- Department of Physiology and Functional Genomics, The University of Florida College of Medicine, Gainesville, FL 32610-0274, USA
| | - Sung Yun Jung
- Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Yong-Jian Geng
- Department of Internal Medicine, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Hyun Kyoung Lee
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX 77030, USA
| | - Zheng Chen
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA
| | - Seung-Hee Yoo
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, 6431 Fannin St., Houston, TX 77030, USA.
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11
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Gray S, Santiago ER, Chappie JS, Cohen PE. Cyclin N-Terminal Domain-Containing-1 Coordinates Meiotic Crossover Formation with Cell-Cycle Progression in a Cyclin-Independent Manner. Cell Rep 2021; 32:107858. [PMID: 32640224 PMCID: PMC7341696 DOI: 10.1016/j.celrep.2020.107858] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 05/14/2020] [Accepted: 06/12/2020] [Indexed: 01/01/2023] Open
Abstract
During mammalian meiotic prophase I, programmed DNA double-strand breaks are repaired by non-crossover or crossover events, the latter predominantly occurring via the class I crossover pathway and requiring the cyclin N-terminal domain-containing 1(CNTD1) protein. Using an epitope-tagged Cntd1 allele, we detect a short isoform of CNTD1 in vivo that lacks a predicted N-terminal cyclin domain and does not bind cyclin-dependent kinases. Instead, we find that the short-form CNTD1 variant associates with components of the replication factor C (RFC) machinery to facilitate crossover formation, and with the E2 ubiquitin conjugating enzyme, CDC34, to regulate ubiquitylation and subsequent degradation of the WEE1 kinase, thereby modulating cell-cycle progression. We propose that these interactions facilitate a role for CNTD1 as a stop-go regulator during prophase I, ensuring accurate and complete crossover formation before allowing metaphase progression and the first meiotic division. CNTD1 associates with sites of crossing over in meiosis, co-localizing with MutLγ In the testis, CNTD1 does not interact with CDKs or with known crossover regulators CNTD1 regulates crossing over via interactions with the replication factor C complex CNTD1 regulates cell-cycle progression via interactions with the SCF complex
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Affiliation(s)
- Stephen Gray
- Department of Biomedical Sciences and Center for Reproductive Genomics, Cornell University, Ithaca, NY 14853, USA.
| | - Emerson R Santiago
- Department of Molecular Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Joshua S Chappie
- Department of Molecular Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Paula E Cohen
- Department of Biomedical Sciences and Center for Reproductive Genomics, Cornell University, Ithaca, NY 14853, USA.
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12
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Dong S, Wei J, Bowser RK, Chen BB, Mallampalli RK, Miao J, Ye Q, Tran KC, Zhao Y, Zhao J. SCF FBXW17 E3 ubiquitin ligase regulates FBXL19 stability and cell migration. J Cell Biochem 2021; 122:326-334. [PMID: 33053230 PMCID: PMC7887023 DOI: 10.1002/jcb.29860] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/28/2020] [Accepted: 09/29/2020] [Indexed: 01/16/2023]
Abstract
The Skp1-Cul1-F-box protein (SCF) E3 ligase complex is one of the largest ubiquitin E3 ligase families. FBXL19, a F-box protein in SCFFBXL19 E3 ligase complex, regulates a variety of cellular responses including cell migration. We have shown that FBXL19 is not stable and its degradation is mediated by the ubiquitin-proteasome system, while the ubiquitin E3 ligase for FBXL19 ubiquitination and degradation has not been identified. In the study, we discovered that a new ubiquitin E3 ligase, SCFFBXW17 , ubiquitinates and induces FBXL19 degradation. Exogenous FBXW17 targets FBXL19 for its ubiquitination and degradation. Lysine 114 in FBXL19 is a potential ubiquitin acceptor site. Acetylation of FBXL19 attenuated SCFFBXW17 -mediated FBXL19 degradation. SCFFBXL19 E3 ligase reduced Rac1 levels and cell migration, while the effects were attenuated by exogenous FBXW17. Downregulation of FBXW17 attenuated lysophosphatidic acid-induced lamellipodia formation and Rac1 accumulation at migration leading edge. Taken together with our previous studies, FBXL19 is degraded by the ubiquitin-proteasome system and its site-specific ubiquitination is mediated by SCFFBXW17 E3 ligase, which promotes cell migration.
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Affiliation(s)
- Su Dong
- Department of Physiology and Cell Biology, Dorothy M. Davis
Heart and Lung Research Institute, The Ohio State University, Columbus, OH
| | - Jianxin Wei
- Department of Medicine, The University of Pittsburgh,
Pittsburgh, PA
| | - Rachel K. Bowser
- Department of Medicine, The University of Pittsburgh,
Pittsburgh, PA
| | - Bill B. Chen
- Department of Medicine, The University of Pittsburgh,
Pittsburgh, PA
| | - Rama K. Mallampalli
- Pulmonary, Critical Care & Sleep Medicine Division, The
Ohio State University, Columbus, OH
| | - Jiaxing Miao
- Department of Physiology and Cell Biology, Dorothy M. Davis
Heart and Lung Research Institute, The Ohio State University, Columbus, OH
| | - Qinmao Ye
- Department of Physiology and Cell Biology, Dorothy M. Davis
Heart and Lung Research Institute, The Ohio State University, Columbus, OH
| | - Kevin C. Tran
- Department of Physiology and Cell Biology, Dorothy M. Davis
Heart and Lung Research Institute, The Ohio State University, Columbus, OH
| | - Yutong Zhao
- Department of Physiology and Cell Biology, Dorothy M. Davis
Heart and Lung Research Institute, The Ohio State University, Columbus, OH,Pulmonary, Critical Care & Sleep Medicine Division, The
Ohio State University, Columbus, OH
| | - Jing Zhao
- Department of Physiology and Cell Biology, Dorothy M. Davis
Heart and Lung Research Institute, The Ohio State University, Columbus, OH,Pulmonary, Critical Care & Sleep Medicine Division, The
Ohio State University, Columbus, OH,Address correspondence to: Jing Zhao, MD, PhD,
Department of Physiology and Cell Biology, The Ohio State University, 333 10th
Avenue, Graves Hall 2166D, Columbus, OH, United States, 43065. Tel:
614-685-0024;
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13
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Salamina M, Montefiore BC, Liu M, Wood DJ, Heath R, Ault JR, Wang LZ, Korolchuk S, Baslé A, Pastok MW, Reeks J, Tatum NJ, Sobott F, Arold ST, Pagano M, Noble ME, Endicott JA. Discriminative SKP2 Interactions with CDK-Cyclin Complexes Support a Cyclin A-Specific Role in p27KIP1 Degradation. J Mol Biol 2021; 433:166795. [PMID: 33422522 PMCID: PMC7895821 DOI: 10.1016/j.jmb.2020.166795] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 12/11/2020] [Accepted: 12/28/2020] [Indexed: 12/29/2022]
Abstract
The SCFSKP2 ubiquitin ligase relieves G1 checkpoint control of CDK-cyclin complexes by promoting p27KIP1 degradation. We describe reconstitution of stable complexes containing SKP1-SKP2 and CDK1-cyclin B or CDK2-cyclin A/E, mediated by the CDK regulatory subunit CKS1. We further show that a direct interaction between a SKP2 N-terminal motif and cyclin A can stabilize SKP1-SKP2-CDK2-cyclin A complexes in the absence of CKS1. We identify the SKP2 binding site on cyclin A and demonstrate the site is not present in cyclin B or cyclin E. This site is distinct from but overlapping with features that mediate binding of p27KIP1 and other G1 cyclin regulators to cyclin A. We propose that the capacity of SKP2 to engage with CDK2-cyclin A by more than one structural mechanism provides a way to fine tune the degradation of p27KIP1 and distinguishes cyclin A from other G1 cyclins to ensure orderly cell cycle progression.
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Affiliation(s)
- Marco Salamina
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Bailey C. Montefiore
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Mengxi Liu
- Department of Biochemistry and Molecular Pharmacology, Perlmutter NYU Cancer Center, New York University Grossman School of Medicine, and Howard Hughes Medical Institute, The Alexandria Center of Life Science, East Tower, 450 E, 29th Street, New York, NY 10016, USA
| | - Daniel J. Wood
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Richard Heath
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - James R. Ault
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Lan-Zhen Wang
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Svitlana Korolchuk
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Arnaud Baslé
- Biosciences Institute, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Martyna W. Pastok
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Judith Reeks
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Natalie J. Tatum
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Frank Sobott
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Stefan T. Arold
- Division of Biological and Environmental Sciences and Engineering (BESE), Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
- Centre de Biochimie Structurale, CNRS, INSERM, Université de Montpellier, 34090 Montpellier, France
| | - Michele Pagano
- Department of Biochemistry and Molecular Pharmacology, Perlmutter NYU Cancer Center, New York University Grossman School of Medicine, and Howard Hughes Medical Institute, The Alexandria Center of Life Science, East Tower, 450 E, 29th Street, New York, NY 10016, USA
| | - Martin E.M. Noble
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Jane A. Endicott
- Newcastle University Centre for Cancer, Translational and Clinical Research Institute, Newcastle University, Paul O’Gorman Building, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
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14
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Huang M, Lin Y, Wang L, You X, Wang S, Zhao J, Bai M, Li Z, Chen Y. Adipose tissue lipolysis is regulated by PAQR11 via altering protein stability of phosphodiesterase 4D. Mol Metab 2021; 47:101182. [PMID: 33549845 PMCID: PMC7906896 DOI: 10.1016/j.molmet.2021.101182] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 01/31/2021] [Accepted: 02/01/2021] [Indexed: 01/13/2023] Open
Abstract
Fat storage and mobilization in adipose tissue play a central role in energy metabolism and are directly linked to the development of obesity. Upon starvation, fat is mobilized from adipose tissue by lipolysis, a process by which triglycerides are hydrolyzed to free fatty acids to be used as an energy source in skeletal muscles and other tissues. However, how lipolysis is activated by starvation is not fully known. In this study, we demonstrate that PAQR11, a member of the progesterone and AdipoQ receptor family, regulates starvation-mediated lipolysis. Paqr11-deleted mice are resistant to high-fat diet-induced obesity. Paqr11 deletion promotes lipolysis in white adipose tissue, characterized by increased phosphorylations of hormone-sensitive lipase (HSL) and perilipin 1 (PLIN1) and elevated serum levels of glycerol and free fatty acids. PKA activity and cAMP levels in white adipose tissue are also increased by Paqr11 deletion, accompanied by accelerated protein degradation of phosphodiesterase 4D (PDE4D). Mechanistically, PAQR11 decreases the interaction of PDE4D with SKP1-CUL1-FBXO2 E3 ligase complex, thus modulating the polyubiquitination/degradation of PDE4D. Fasting decreases the expression of the Paqr11 gene, and starvation-induced lipolysis in white adipose tissue is enhanced by Paqr11 deletion, while insulin-mediated suppression of lipolysis is not affected. Collectively, these results reveal that PAQR11 regulates lipolysis of adipose tissue and affects high-fat diet-induced obesity. Paqr11 deletion promotes lipolysis in epididymal white adipose tissue. PAQR11 modulates cAMP level by altering protein degradation of PDE4D. PAQR11 affects the interaction of PDE4D with SKP1-CUL1-FBXO2 E3 ligase complex. PAQR11 regulates starvation-induced lipolysis in adipose tissue.
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Affiliation(s)
- Meiqin Huang
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Yijun Lin
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Lin Wang
- China Animal Health and Epidemiology Center, Qingdao, Shangdong, 266032, China
| | - Xue You
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Shuo Wang
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Jingyu Zhao
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Meijuan Bai
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Zixuan Li
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Yan Chen
- CAS Key Laboratory of Nutrition, Metabolism, and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
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15
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Liu Z, Nailwal H, Rector J, Rahman MM, Sam R, McFadden G, Chan FKM. A class of viral inducer of degradation of the necroptosis adaptor RIPK3 regulates virus-induced inflammation. Immunity 2021; 54:247-258.e7. [PMID: 33444549 DOI: 10.1016/j.immuni.2020.11.020] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 09/10/2020] [Accepted: 11/23/2020] [Indexed: 12/13/2022]
Abstract
The vaccine strain against smallpox, vaccinia virus (VACV), is highly immunogenic yet causes relatively benign disease. These attributes are believed to be caused by gene loss in VACV. Using a targeted small interfering RNA (siRNA) screen, we identified a viral inhibitor found in cowpox virus (CPXV) and other orthopoxviruses that bound to the host SKP1-Cullin1-F-box (SCF) machinery and the essential necroptosis kinase receptor interacting protein kinase 3 (RIPK3). This "viral inducer of RIPK3 degradation" (vIRD) triggered ubiquitination and proteasome-mediated degradation of RIPK3 and inhibited necroptosis. In contrast to orthopoxviruses, the distantly related leporipoxvirus myxoma virus (MYXV), which infects RIPK3-deficient hosts, lacks a functional vIRD. Introduction of vIRD into VACV, which encodes a truncated and defective vIRD, enhanced viral replication in mice. Deletion of vIRD reduced CPXV-induced inflammation, viral replication, and mortality, which were reversed in RIPK3- and MLKL-deficient mice. Hence, vIRD-RIPK3 drives pathogen-host evolution and regulates virus-induced inflammation and pathogenesis.
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Affiliation(s)
- Zhijun Liu
- Department of Immunology, Duke University School of Medicine, DUMC 3010, Durham, NC 27710, USA
| | - Himani Nailwal
- Department of Pathology, Immunology and Microbiology Program, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Jonah Rector
- Department of Immunology, Duke University School of Medicine, DUMC 3010, Durham, NC 27710, USA
| | - Masmudur M Rahman
- Center for Immunotherapy, Vaccines and Virotherapy, Biodesign Institute, Arizona State University, Tempe, AZ 85281, USA
| | - Richard Sam
- Department of Pathology, Immunology and Microbiology Program, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Grant McFadden
- Center for Immunotherapy, Vaccines and Virotherapy, Biodesign Institute, Arizona State University, Tempe, AZ 85281, USA
| | - Francis Ka-Ming Chan
- Department of Immunology, Duke University School of Medicine, DUMC 3010, Durham, NC 27710, USA; Department of Pathology, Immunology and Microbiology Program, University of Massachusetts Medical School, Worcester, MA 01655, USA.
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16
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Bungsy M, Palmer MCL, Jeusset LM, Neudorf NM, Lichtensztejn Z, Nachtigal MW, McManus KJ. Reduced RBX1 expression induces chromosome instability and promotes cellular transformation in high-grade serous ovarian cancer precursor cells. Cancer Lett 2020; 500:194-207. [PMID: 33290867 DOI: 10.1016/j.canlet.2020.11.051] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 11/26/2020] [Accepted: 11/30/2020] [Indexed: 12/14/2022]
Abstract
Despite high-grade serous ovarian cancer (HGSOC) being the most common and lethal gynecological cancer in women, the early etiological events driving disease development remain largely unknown. Emerging evidence now suggests that chromosome instability (CIN; ongoing changes in chromosome numbers) may play a central role in the development and progression of HGSOC. Importantly, genomic amplification of the Cyclin E1 gene (CCNE1) contributes to HGSOC pathogenesis in ~20% of patients, while Cyclin E1 overexpression induces CIN in model systems. Cyclin E1 levels are normally regulated by the SCF (SKP1-CUL1-FBOX) complex, an E3 ubiquitin ligase that includes RBX1 as a core component. Interestingly, RBX1 is heterozygously lost in ~80% of HGSOC cases and reduced expression corresponds with worse outcomes, suggesting it may be a pathogenic event. Using both short (siRNA) and long (CRISPR/Cas9) term approaches, we show that reduced RBX1 expression corresponds with significant increases in CIN phenotypes in fallopian tube secretory epithelial cells, a cellular precursor of HGSOC. Moreover, reduced RBX1 expression corresponds with increased Cyclin E1 levels and anchorage-independent growth. Collectively, these data identify RBX1 as a novel CIN gene with pathogenic implications for HGSOC.
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Affiliation(s)
- Manisha Bungsy
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Michaela C L Palmer
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Lucile M Jeusset
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Nicole M Neudorf
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Zelda Lichtensztejn
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Mark W Nachtigal
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Obstetrics, Gynecology & Reproductive Sciences, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Kirk J McManus
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada.
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17
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Ji H, Liu D, Zhang Z, Sun J, Han B, Li Z. A bacterial F-box effector suppresses SAR immunity through mediating the proteasomal degradation of OsTrxh2 in rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 104:1054-1072. [PMID: 32881160 DOI: 10.1111/tpj.14980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 08/06/2020] [Accepted: 08/10/2020] [Indexed: 06/11/2023]
Abstract
Plant bacterial pathogens usually cause diseases by secreting and translocating numerous virulence effectors into host cells and suppressing various host immunity pathways. It has been demonstrated that the extensive ubiquitin systems of host cells are frequently interfered with or hijacked by numerous pathogenic bacteria, through various strategies. Some type-III secretion system (T3SS) effectors of plant pathogens have been demonstrated to impersonate the F-box protein (FBP) component of the SKP1/CUL1/F-box (SCF) E3 ubiquitin system for their own benefit. Although numerous putative eukaryotic-like F-box effectors have been screened for different bacterial pathogens by bioinformatics analyses, the targets of most F-box effectors in host immune systems remain unknown. Here, we show that XopI, a putative F-box effector of African Xoo (Xanthomonas oryzae pv. oryzae) strain BAI3, strongly inhibits the host's OsNPR1-dependent resistance to Xoo. The xopI knockout mutant displays lower virulence in Oryza sativa (rice) than BAI3. Mechanistically, we identify a thioredoxin protein, OsTrxh2, as an XopI-interacting protein in rice. Although OsTrxh2 positively regulates rice immunity by catalyzing the dissociation of OsNPR1 into monomers in rice, the XopI effector serves as an F-box adapter to form an OSK1-XopI-OsTrxh2 interaction complex, and further disrupts OsNPR1-mediated resistance through proteasomal degradation of OsTrxh2. Our results indicate that XopI targets OsTrxh2 and further represses OsNPR1-dependent signaling, thereby subverting systemic acquired resistance (SAR) immunity in rice.
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Affiliation(s)
- Hongtao Ji
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Delong Liu
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Zhaoxin Zhang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of life Sciences, Nanjing University, Nanjing, 210023, China
| | - Jiawen Sun
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Bing Han
- Institute of Plant Protection, Dezhou Academy of Agricultural Sciences, Dezhou, 253015, China
| | - Zongyun Li
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
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18
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Gori Savellini G, Bini L, Gagliardi A, Anichini G, Gandolfo C, Prathyumnan S, Cusi MG. Ubiquitin and Not Only Unfolded Domains Drives Toscana Virus Non-Structural NSs Protein Degradation. Viruses 2020; 12:E1153. [PMID: 33053780 PMCID: PMC7601456 DOI: 10.3390/v12101153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/05/2020] [Accepted: 10/09/2020] [Indexed: 01/09/2023] Open
Abstract
The non-structural protein NSs of the Phenuiviridae family members appears to have a role in the host immunity escape. The stability of Toscana virus (TOSV) NSs protein was tested by a cycloheximide (CHX) chase approach on cells transfected with NSs deleted versions fused to a reporter gene. The presence of intrinsically disordered regions (IDRs) both at the C- and N-terminus appeared to affect the protein stability. Indeed, the NSsΔC and NSsΔN proteins were more stable than the wild-type NSs counterpart. Since TOSV NSs exerts its inhibitory function by triggering RIG-I for proteasomal degradation, the interaction of the ubiquitin system and TOSV NSs was further examined. Chase experiments with CHX and the proteasome inhibitor MG-132 demonstrated the involvement of the ubiquitin-proteasome system in controlling NSs protein amount expressed in the cells. The analysis of TOSV NSs by mass spectrometry allowed the direct identification of K104, K109, K154, K180, K244, K294, and K298 residues targeted for ubiquitination. Analysis of NSs K-mutants confirmed the presence and the important role of lysine residues located in the central and the C-terminal parts of the protein in controlling the NSs cellular level. Therefore, we directly demonstrated a new cellular pathway involved in controlling TOSV NSs fate and activity, and this opens the way to new investigations among more pathogenic viruses of the Phenuiviridae family.
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Affiliation(s)
- Gianni Gori Savellini
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy; (G.A.); (C.G.); (S.P.); (M.G.C.)
| | - Luca Bini
- Department of Life Sciences, University of Siena, 53100 Siena, Italy;
| | - Assunta Gagliardi
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Laboratory of Synthetic and Structural Vaccinology, 38122 Trento, Italy;
| | - Gabriele Anichini
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy; (G.A.); (C.G.); (S.P.); (M.G.C.)
| | - Claudia Gandolfo
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy; (G.A.); (C.G.); (S.P.); (M.G.C.)
- S. Maria delle Scotte Hospital, V.le Bracci, 1, 53100 Siena, Italy
| | - Shibily Prathyumnan
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy; (G.A.); (C.G.); (S.P.); (M.G.C.)
| | - Maria Grazia Cusi
- Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy; (G.A.); (C.G.); (S.P.); (M.G.C.)
- S. Maria delle Scotte Hospital, V.le Bracci, 1, 53100 Siena, Italy
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19
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Dabool L, Hakim-Mishnaevski K, Juravlev L, Flint-Brodsly N, Mandel S, Kurant E. Drosophila Skp1 Homologue SkpA Plays a Neuroprotective Role in Adult Brain. iScience 2020; 23:101375. [PMID: 32739834 PMCID: PMC7399183 DOI: 10.1016/j.isci.2020.101375] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/14/2020] [Accepted: 07/14/2020] [Indexed: 11/17/2022] Open
Abstract
Skp1, a component of the ubiquitin E3 ligases, was found to be decreased in the brains of sporadic Parkinson's disease (PD) patients, and its overexpression prevented death of murine neurons in culture. Here we expose the neuroprotective role of the Drosophila skp1 homolog, skpA, in the adult brain. Neuronal knockdown of skpA leads to accumulation of ubiquitinated protein aggregates and loss of dopaminergic neurons accompanied by motor dysfunction and reduced lifespan. Conversely, neuronal overexpression of skpA reduces aggregate load, improves age-related motor decline, and prolongs lifespan. Moreover, SkpA rescues neurodegeneration in a Drosophila model of PD. We also show that a Drosophila homolog of FBXO7, the F Box protein, Nutcracker (Ntc), works in the same pathway with SkpA. However, skpA overexpression rescues ntc knockdown phenotype, suggesting that SkpA interacts with additional F box proteins in the adult brain neurons. Collectively, our study discloses Skp1/SkpA as a potential therapeutic target in neurodegenerative diseases. SkpA-mediated protein degradation is required for normal function of the adult brain SkpA overexpression rescues neurodegeneration in α-synuclein-induced fly PD model SkpA and Ntc work in the same pathway of protein degradation in adult brain neurons
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Affiliation(s)
- Lital Dabool
- Department of Human Biology, Faculty of Natural Sciences, University of Haifa, 199 Aba Khoushy Avenue, Mount Carmel, Haifa 34988-38, Israel; The Rappaport Family Institute for Research in the Medical Sciences, Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Ketty Hakim-Mishnaevski
- Department of Human Biology, Faculty of Natural Sciences, University of Haifa, 199 Aba Khoushy Avenue, Mount Carmel, Haifa 34988-38, Israel
| | - Liza Juravlev
- Department of Human Biology, Faculty of Natural Sciences, University of Haifa, 199 Aba Khoushy Avenue, Mount Carmel, Haifa 34988-38, Israel
| | - Naama Flint-Brodsly
- Department of Human Biology, Faculty of Natural Sciences, University of Haifa, 199 Aba Khoushy Avenue, Mount Carmel, Haifa 34988-38, Israel
| | - Silvia Mandel
- The Rappaport Family Institute for Research in the Medical Sciences, Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Estee Kurant
- Department of Human Biology, Faculty of Natural Sciences, University of Haifa, 199 Aba Khoushy Avenue, Mount Carmel, Haifa 34988-38, Israel; The Rappaport Family Institute for Research in the Medical Sciences, Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel.
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20
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Schaefer KN, Pronobis MI, Williams CE, Zhang S, Bauer L, Goldfarb D, Yan F, Major MB, Peifer M. Wnt regulation: exploring Axin-Disheveled interactions and defining mechanisms by which the SCF E3 ubiquitin ligase is recruited to the destruction complex. Mol Biol Cell 2020; 31:992-1014. [PMID: 32129710 PMCID: PMC7346726 DOI: 10.1091/mbc.e19-11-0647] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Wnt signaling plays key roles in embryonic development and adult stem cell homeostasis and is altered in human cancer. Signaling is turned on and off by regulating stability of the effector β-catenin (β-cat). The multiprotein destruction complex binds and phosphorylates β-cat and transfers it to the SCF-TrCP E3-ubiquitin ligase for ubiquitination and destruction. Wnt signals act though Dishevelled to turn down the destruction complex, stabilizing β-cat. Recent work clarified underlying mechanisms, but important questions remain. We explore β-cat transfer from the destruction complex to the E3 ligase, and test models suggesting Dishevelled and APC2 compete for association with Axin. We find that Slimb/TrCP is a dynamic component of the destruction complex biomolecular condensate, while other E3 proteins are not. Recruitment requires Axin and not APC, and Axin’s RGS domain plays an important role. We find that elevating Dishevelled levels in Drosophila embryos has paradoxical effects, promoting the ability of limiting levels of Axin to turn off Wnt signaling. When we elevate Dishevelled levels, it forms its own cytoplasmic puncta, but these do not recruit Axin. Superresolution imaging in mammalian cells raises the possibility that this may result by promoting Dishevelled:Dishevelled interactions at the expense of Dishevelled: Axin interactions when Dishevelled levels are high.
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Affiliation(s)
- Kristina N Schaefer
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Mira I Pronobis
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Clara E Williams
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Shiping Zhang
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Lauren Bauer
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Dennis Goldfarb
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.,Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110.,Institute for Informatics, Washington University School of Medicine, St. Louis, MO 63110
| | - Feng Yan
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - M Ben Major
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.,Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.,Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110.,Department of Otolaryngology, Washington University School of Medicine, St. Louis, MO 63110
| | - Mark Peifer
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.,Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
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21
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Shi W, Ding R, Zhou PP, Fang Y, Wan R, Chen Y, Jin J. Coordinated Actions Between p97 and Cullin-RING Ubiquitin Ligases for Protein Degradation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1217:61-78. [PMID: 31898222 DOI: 10.1007/978-981-15-1025-0_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The cullin-RING ubiquitin ligases comprise the largest subfamily of ubiquitin ligases. They control ubiquitylation and degradation of a large number of protein substrates in eukaryotes. p97 is an ATPase domain-containing protein segregase. It plays essential roles in post-ubiquitylational events in the ubiquitin-proteasome pathway. Together with its cofactors, p97 collaborates with ubiquitin ligases to extract ubiquitylated substrates and deliver them to the proteasome for proteolysis. Here we review the structure, functions, and mechanisms of p97 in cellular protein degradation in coordination with its cofactors and the cullin-RING ubiquitin ligases.
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Affiliation(s)
- Wenbo Shi
- Life Science Institute, Zhejiang University, HangZhou, China
| | - Ran Ding
- Life Science Institute, Zhejiang University, HangZhou, China
| | - Pei Pei Zhou
- Life Science Institute, Zhejiang University, HangZhou, China
| | - Yuan Fang
- Life Science Institute, Zhejiang University, HangZhou, China
| | - Ruixi Wan
- Life Science Institute, Zhejiang University, HangZhou, China
| | - Yilin Chen
- Life Science Institute, Zhejiang University, HangZhou, China
| | - Jianping Jin
- Life Science Institute, Zhejiang University, HangZhou, China.
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22
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Zhang Q, Wang W, Gao Q. β-TRCP-mediated AEBP2 ubiquitination and destruction controls cisplatin resistance in ovarian cancer. Biochem Biophys Res Commun 2019; 523:274-279. [PMID: 31864706 DOI: 10.1016/j.bbrc.2019.12.050] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 12/10/2019] [Indexed: 02/07/2023]
Abstract
AEBP2 is a zinc finger protein and a potential targeting protein for the mammalian Polycomb Repression Complex 2 (PRC2). The role of AEBP2 in the regulation of the migration and development of the neural crest cells through the PRC2-mediated epigenetic mechanism has been well-documented. However, whether AEBP2 plays a role in cancer and how to regulate AEBP2 itself remains largely unknown. Here, we show that genetic knockout of AEBP2 inhibited ovarian cancer cells proliferation and increased cisplatin sensitivity. Moreover, AEBP2 contains a non-canonical phosphodegron and is constantly targeted for ubiquitylation and proteasomal degradation by a SKP1-CUL1-F-box protein (SCF) β-TrCP ubiquitin ligase complex. Failure to degrade AEBP2 conferred cisplatin resistance in ovarian cancer. Overall, this study reveals an oncogenic role of AEBP2 in ovarian cancer and provides a rationale to target β-TRCP-AEBP2 axis in ovarian cancer that may be therapeutically beneficial.
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Affiliation(s)
- Qin Zhang
- Obstetrics and Gynecology Department of the First People's Hospital of Jing Zhou, The First Clinical Medical College of Yangtze University, China
| | - Wei Wang
- Reproductive Center of Jingzhou Central Hospital, The Second Clinical Medical College of Yangtze University, China
| | - Qun Gao
- Jingzhou Maternal and Child Health Care Hospital, No.233 Jingzhong Road, Jingzhou, Hubei, China.
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23
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Seifert ME, Gaut JP, Guo B, Jain S, Malone AF, Geraghty F, Manna DD, Yang ES, Yi N, Brennan DC, Mannon RB. WNT pathway signaling is associated with microvascular injury and predicts kidney transplant failure. Am J Transplant 2019; 19:2833-2845. [PMID: 30916889 PMCID: PMC6763350 DOI: 10.1111/ajt.15372] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 03/15/2019] [Accepted: 03/20/2019] [Indexed: 01/25/2023]
Abstract
Microvascular injury is associated with accelerated kidney transplant dysfunction and allograft failure. Molecular pathology can identify new mechanisms of microvascular injury while improving on the diagnostic and prognostic capabilities of traditional histology. We conducted a case-control study of archived kidney biopsy specimens stored up to 10 years with microvascular injury (n = 50) compared with biopsy specimens without histologic injury (n = 45) from patients of similar age, race, and sex. We measured WNT gene expression with a multiplex quantification platform by using digital barcoding, given the importance of WNT reactivation to the response to wounding in the kidney microvasculature and other compartments. Of 210 genes from a commercial WNT panel, 71 were associated with microvascular injury and 79 were associated with allograft failure, with considerable overlap of genes between each set. Molecular pathology identified 46 biopsy specimens with molecular evidence of microvascular injury; 18 (39%) were either C4d negative, donor-specific antibody negative, or had no microvascular injury by histology. The majority of cases with molecular evidence of microvascular injury had poor long-term outcomes. We identified novel WNT pathway genes associated with microvascular injury and allograft failure in residual clinical biopsy specimens obtained up to 10 years earlier. Further mechanistic studies may identify the WNT pathway as a new diagnostic and therapeutic target.
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Affiliation(s)
- Michael E. Seifert
- Department of Pediatrics, University of Alabama School of Medicine, Birmingham, AL
| | - Joseph P. Gaut
- Department of Pathology, Washington University, St. Louis, Missouri
| | - Boyi Guo
- Department of Biostatistics, School of Public Health, University of Alabama, Birmingham, Alabama
| | - Sanjay Jain
- Division of Nephrology, Department of Medicine, Washington University, St. Louis, Missouri
| | - Andrew F. Malone
- Division of Nephrology, Department of Medicine, Washington University, St. Louis, Missouri
| | - Feargal Geraghty
- Division of Nephrology, Department of Medicine, Washington University, St. Louis, Missouri
| | - Deborah Della Manna
- UAB NanoString Laboratory, Department of Radiation Oncology, University of Alabama School of Medicine, Birmingham, Alabama
| | - Eddy S. Yang
- UAB NanoString Laboratory, Department of Radiation Oncology, University of Alabama School of Medicine, Birmingham, Alabama
| | - Nengjun Yi
- Department of Biostatistics, School of Public Health, University of Alabama, Birmingham, Alabama
| | - Daniel C. Brennan
- Division of Nephrology, Department of Medicine, Washington University, St. Louis, Missouri,Comprehensive Transplant Center, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Roslyn B. Mannon
- Department of Medicine, University of Alabama School of Medicine, Birmingham, Alabama,Comprehensive Transplant Institute, University of Alabama School of Medicine, Birmingham, Alabama
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24
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CAND1 regulates lunapark for the proper tubular network of the endoplasmic reticulum. Sci Rep 2019; 9:13152. [PMID: 31511573 PMCID: PMC6739345 DOI: 10.1038/s41598-019-49542-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/27/2019] [Indexed: 12/31/2022] Open
Abstract
Endoplasmic reticulum (ER) tubules connect each other by three-way junctions, resulting in a tubular ER network. Oligomerization of three-way junction protein lunapark (Lnp) is important for its localization and the three-way junction stability. On the other hand, Lnp has an N-terminal ubiquitin ligase activity domain, which is also important for the three-way junction localization. To understand the mode of action of Lnp, we isolated Cullin-associated and neddylation-dissociated 1 (CAND1), a regulator of Skp1-Cul1-F-box (SCF) ubiquitin ligase, as a Lnp-binding protein by affinity chromatography. CAND1 and Lnp form a higher-molecular-weight complex in vitro, while they do not co-localize at the three-way junctions. CAND1 reduces the auto-ubiquitination activity of Lnp. CAND1 knockdown enhances proteasomal degradation of Lnp and reduces the tubular ER network in mammalian cells. These results suggest that CAND1 has the potency to promote the formation of the higher-molecular-weight complex with Lnp and reduce the auto-ubiquitination activity of Lnp, thereby regulating the three-way junction stability of the tubular ER network.
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25
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Li X, Zhang N, Zhang Y, Jia P, Guo Y, Tian Y, You S, Wu S, Sun Y. E3 ligase Fbw7 participates in oxidative stress‑induced myocardial cell injury via interacting with Mcl‑1. Mol Med Rep 2019; 20:1561-1568. [PMID: 31257502 PMCID: PMC6625382 DOI: 10.3892/mmr.2019.10394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 05/15/2019] [Indexed: 12/14/2022] Open
Abstract
Oxidative stress participates in several heart diseases and is an important mechanism contributing to the pathological alterations of myocardial cell injury. In recent years, ubiquitylation has been demonstrated to be an important biochemical reaction associated with apoptosis. To investigate the effects and interactions of the E3 ligase F-box and WD repeat domain containing 7 (Fbw7) and MCL1 apoptosis regulator, BCL2 family member (Mcl-1) in myocardial cells during oxidative stress, Cell Counting Kit-8, flow cytometry, western blot, reactive oxygen species and co-immunoprecipitation assays were conducted. The current study revealed that Fbw7 may facilitate apoptosis via the Mcl-1-Bax pathway in oxidative stress-induced myocardial H9c2 cell injury. Mcl-1 inhibits the functions of Bcl-2 family members, including the mitochondrial apoptosis factor Bax, to maintain cell viability; however, the present study suggested that Fbw7 may degrade Mcl-1 and impaired this process. Therefore, it may be hypothesized that Fbw-7 promotes myocardial cell injury via interacting with Mcl-1.
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Affiliation(s)
- Xia Li
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Naijin Zhang
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Ying Zhang
- Department of Translational Medicine, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Pengyu Jia
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yuxuan Guo
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yichen Tian
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Shilong You
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Shaojun Wu
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yingxian Sun
- Department of Cardiovascular Medicine, First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
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26
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Ko S, Russell JO, Tian J, Gao C, Kobayashi M, Feng R, Yuan X, Shao C, Ding H, Poddar M, Singh S, Locker J, Weng HL, Monga SP, Shin D. Hdac1 Regulates Differentiation of Bipotent Liver Progenitor Cells During Regeneration via Sox9b and Cdk8. Gastroenterology 2019; 156:187-202.e14. [PMID: 30267710 PMCID: PMC6309465 DOI: 10.1053/j.gastro.2018.09.039] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 09/17/2018] [Accepted: 09/18/2018] [Indexed: 01/06/2023]
Abstract
BACKGROUND & AIMS Upon liver injury in which hepatocyte proliferation is compromised, liver progenitor cells (LPCs), derived from biliary epithelial cells (BECs), differentiate into hepatocytes. Little is known about the mechanisms of LPC differentiation. We used zebrafish and mouse models of liver injury to study the mechanisms. METHODS We used transgenic zebrafish, Tg(fabp10a:CFP-NTR), to study the effects of compounds that alter epigenetic factors on BEC-mediated liver regeneration. We analyzed zebrafish with disruptions of the histone deacetylase 1 gene (hdac1) or exposed to MS-275 (an inhibitor of Hdac1, Hdac2, and Hdac3). We also analyzed zebrafish with mutations in sox9b, fbxw7, kdm1a, and notch3. Zebrafish larvae were collected and analyzed by whole-mount immunostaining and in situ hybridization; their liver tissues were collected for quantitative reverse transcription polymerase chain reaction. We studied mice in which hepatocyte-specific deletion of β-catenin (Ctnnb1flox/flox mice injected with Adeno-associated virus serotype 8 [AAV8]-TBG-Cre) induces differentiation of LPCs into hepatocytes after a choline-deficient, ethionine-supplemented (CDE) diet. Liver tissues were collected and analyzed by immunohistochemistry and immunoblots. We performed immunohistochemical analyses of liver tissues from patients with compensated or decompensated cirrhosis or acute on chronic liver failure (n = 15). RESULTS Loss of Hdac1 activity in zebrafish blocked differentiation of LPCs into hepatocytes by increasing levels of sox9b mRNA and reduced differentiation of LPCs into BECs by increasing levels of cdk8 mRNA, which encodes a negative regulator gene of Notch signaling. We identified Notch3 as the receptor that regulates differentiation of LPCs into BECs. Loss of activity of Kdm1a, a lysine demethylase that forms repressive complexes with Hdac1, produced the same defects in differentiation of LPCs into hepatocytes and BECs as observed in zebrafish with loss of Hdac1 activity. Administration of MS-275 to mice with hepatocyte-specific loss of β-catenin impaired differentiation of LPCs into hepatocytes after the CDE diet. HDAC1 was expressed in reactive ducts and hepatocyte buds of liver tissues from patients with cirrhosis. CONCLUSIONS Hdac1 regulates differentiation of LPCs into hepatocytes via Sox9b and differentiation of LPCs into BECs via Cdk8, Fbxw7, and Notch3 in zebrafish with severe hepatocyte loss. HDAC1 activity was also required for differentiation of LPCs into hepatocytes in mice with liver injury after the CDE diet. These pathways might be manipulated to induce LPC differentiation for treatment of patients with advanced liver diseases.
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Affiliation(s)
- Sungjin Ko
- Department of Developmental Biology, McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania; Department of Pathology, Pittsburgh, Pennsylvania.
| | | | - Jianmin Tian
- Department of Pathology, University of Pittsburgh, Pittsburgh, USA,Pittsburgh Liver Research Center, University of Pittsburgh, Pittsburgh, USA
| | - Ce Gao
- MOE Key Laboratory for Molecular Animal Nutrition, College of Animal Sciences, Zhejiang University, Hangzhou, China
| | - Makoto Kobayashi
- Department of Molecular and Developmental Biology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Rilu Feng
- Department of Medicine II, Section Molecular Hepatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Xiaodong Yuan
- Department of Medicine II, Section Molecular Hepatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Chen Shao
- Department of Pathology, Beijing You’an Hospital, Capital Medical University, Beijing, China
| | - Huiguo Ding
- Department of Gastroenterology and Hepatology, Beijing You’an Hospital, Capital Medical University, Beijing, China
| | - Minakshi Poddar
- Department of Pathology, University of Pittsburgh, Pittsburgh, USA
| | - Sucha Singh
- Department of Pathology, University of Pittsburgh, Pittsburgh, USA
| | - Joseph Locker
- Department of Pathology, University of Pittsburgh, Pittsburgh, USA,Pittsburgh Liver Research Center, University of Pittsburgh, Pittsburgh, USA
| | - Hong-Lei Weng
- Department of Medicine II, Section Molecular Hepatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Satdarshan P. Monga
- Department of Pathology, University of Pittsburgh, Pittsburgh, USA,Pittsburgh Liver Research Center, University of Pittsburgh, Pittsburgh, USA,Department of Medicine, University of Pittsburgh, Pittsburgh, USA
| | - Donghun Shin
- Department of Developmental Biology, McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania; Pittsburgh Liver Research Center, Pittsburgh, Pennsylvania.
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27
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White KA, Grillo-Hill BK, Esquivel M, Peralta J, Bui VN, Chire I, Barber DL. β-Catenin is a pH sensor with decreased stability at higher intracellular pH. J Cell Biol 2018; 217:3965-3976. [PMID: 30315137 PMCID: PMC6219716 DOI: 10.1083/jcb.201712041] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 07/16/2018] [Accepted: 08/31/2018] [Indexed: 02/08/2023] Open
Abstract
White et al. find that intracellular pH regulates the stability of β-catenin, the Wnt signaling molecule that controls cell polarity, adhesion, and differentiation. A conserved histidine residue in β-catenin mediates pH-dependent binding to the E3 ligase β-TrCP for degradation, and a cancer-associated mutation that bypasses this pH-sensitive regulation induces ectopic tumors in the Drosophila eye. β-Catenin functions as an adherens junction protein for cell–cell adhesion and as a signaling protein. β-catenin function is dependent on its stability, which is regulated by protein–protein interactions that stabilize β-catenin or target it for proteasome-mediated degradation. In this study, we show that β-catenin stability is regulated by intracellular pH (pHi) dynamics, with decreased stability at higher pHi in both mammalian cells and Drosophila melanogaster. β-Catenin degradation requires phosphorylation of N-terminal residues for recognition by the E3 ligase β-TrCP. While β-catenin phosphorylation was pH independent, higher pHi induced increased β-TrCP binding and decreased β-catenin stability. An evolutionarily conserved histidine in β-catenin (found in the β-TrCP DSGIHS destruction motif) is required for pH-dependent binding to β-TrCP. Expressing a cancer-associated H36R–β-catenin mutant in the Drosophila eye was sufficient to induce Wnt signaling and produced pronounced tumors not seen with other oncogenic β-catenin alleles. We identify pHi dynamics as a previously unrecognized regulator of β-catenin stability, functioning in coincidence with phosphorylation.
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Affiliation(s)
- Katharine A White
- Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, CA
| | - Bree K Grillo-Hill
- Department of Biological Sciences, San Jose State University, San Jose, CA
| | - Mario Esquivel
- Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, CA
| | - Jobelle Peralta
- Department of Biological Sciences, San Jose State University, San Jose, CA
| | - Vivian N Bui
- Department of Biological Sciences, San Jose State University, San Jose, CA
| | - Ismahan Chire
- Department of Biological Sciences, San Jose State University, San Jose, CA
| | - Diane L Barber
- Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, CA
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28
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Madigan JP, Hou F, Ye L, Hu J, Dong A, Tempel W, Yohe ME, Randazzo PA, Jenkins LMM, Gottesman MM, Tong Y. The tuberous sclerosis complex subunit TBC1D7 is stabilized by Akt phosphorylation-mediated 14-3-3 binding. J Biol Chem 2018; 293:16142-16159. [PMID: 30143532 DOI: 10.1074/jbc.ra118.003525] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 08/13/2018] [Indexed: 01/19/2023] Open
Abstract
The tuberous sclerosis complex (TSC) is a negative regulator of mTOR complex 1, a signaling node promoting cellular growth in response to various nutrients and growth factors. However, several regulators in TSC signaling still await discovery and characterization. Using pulldown and MS approaches, here we identified the TSC complex member, TBC1 domain family member 7 (TBC1D7), as a binding partner for PH domain and leucine-rich repeat protein phosphatase 1 (PHLPP1), a negative regulator of Akt kinase signaling. Most TBC domain-containing proteins function as Rab GTPase-activating proteins (RabGAPs), but the crystal structure of TBC1D7 revealed that it lacks residues critical for RabGAP activity. Sequence analysis identified a putative site for both Akt-mediated phosphorylation and 14-3-3 binding at Ser-124, and we found that Akt phosphorylates TBC1D7 at Ser-124. However, this phosphorylation had no effect on the binding of TBC1D7 to TSC1, but stabilized TBC1D7. Moreover, 14-3-3 protein both bound and stabilized TBC1D7 in a growth factor-dependent manner, and a phospho-deficient substitution, S124A, prevented this interaction. The crystal structure of 14-3-3ζ in complex with a phospho-Ser-124 TBC1D7 peptide confirmed the direct interaction between 14-3-3 and TBC1D7. The sequence immediately upstream of Ser-124 aligned with a canonical β-TrCP degron, and we found that the E3 ubiquitin ligase β-TrCP2 ubiquitinates TBC1D7 and decreases its stability. Our findings reveal that Akt activity determines the phosphorylation status of TBC1D7 at the phospho-switch Ser-124, which governs binding to either 14-3-3 or β-TrCP2, resulting in increased or decreased stability of TBC1D7, respectively.
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Affiliation(s)
| | - Feng Hou
- the Structural Genomics Consortium and
| | - Linlei Ye
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5G 1L7, Canada, and
| | | | | | | | | | - Paul A Randazzo
- Laboratory of Cell and Molecular Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | | | | | - Yufeng Tong
- the Structural Genomics Consortium and .,the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada
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29
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MicroRNA-324-5p suppresses the migration and invasion of MM cells by inhibiting the SCF β-TrCP E3 ligase. Oncol Lett 2018; 16:5331-5338. [PMID: 30250603 DOI: 10.3892/ol.2018.9245] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 02/20/2018] [Indexed: 12/12/2022] Open
Abstract
Multiple myeloma (MM) is a cytogenetically heterogeneous malignancy of plasma cells in bone marrow. Among the cytogenetic abnormalities of MM, del(17p) is a well-recognized high-risk genetic lesion associated with the late stage and progression of the disease. MicroRNA (miR)-324-5p, located at 17p13.1, was identified to be involved in the dysregulation of a number of types of malignant disease. However, whether miR-324-5p is associated with the development and progression of MM remains unknown. In the present study, the expression status of miR-324-5p in MM, and its effect on the migratory and invasive ability of MM cells were investigated. Using ubiquitination pathway polymerase chain reaction array, the inhibitory effect of miR-324-5p on the ubiquitinated proteins was investigated. It was identified that miR-324-5p levels were decreased in samples from patients with MM and MM cell lines. Increased expression of miR-324-5p by transfection of miR-324-5p mimic suppressed the proliferative, migratory and invasive abilities of MM.1R cells. Furthermore, increased expression of miR-324-5p in MM.1R cells inhibited the ubiquitination pathway and decreased the levels of ubiquitination-associated proteins, particularly the Skp1-Cullin1-F-box β-transducin repeat-containing protein (SCFβ-TrCP) E3 ligase. In addition, the results of the present study demonstrated that the SCFβ-TrCP E3 ligase may contribute to the suppression of MM cell motility by inhibiting the expression of metastasis-associated genes, including metastasis suppressor 1. In conclusion, the results of the present study suggested that miR-324-5p may act as a tumor suppressor by impairing the motility of MM cells by suppressing the ubiquitination pathway.
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30
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Liu J, Song T, Zhou W, Xing L, Wang S, Ho M, Peng Z, Tai YT, Hideshima T, Anderson KC, Cang Y. A genome-scale CRISPR-Cas9 screening in myeloma cells identifies regulators of immunomodulatory drug sensitivity. Leukemia 2018; 33:171-180. [PMID: 30026574 DOI: 10.1038/s41375-018-0205-y] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 05/03/2018] [Accepted: 06/08/2018] [Indexed: 12/31/2022]
Abstract
Immunomodulatory drugs (IMiDs) including lenalidomide and pomalidomide bind cereblon (CRBN) and activate the CRL4CRBN ubiquitin ligase to trigger proteasomal degradation of the essential transcription factors IKZF1 and IKZF3 and multiple myeloma (MM) cytotoxicity. We have shown that CRBN is also targeted for degradation by SCFFbxo7 ubiquitin ligase. In the current study, we explored the mechanisms underlying sensitivity of MM cells to IMiDs using genome-wide CRISPR-Cas9 screening. We validate that CSN9 signalosome complex, a deactivator of Cullin-RING ubiquitin ligase, inhibits SCFFbxo7 E3 ligase-mediated CRBN degradation, thereby conferring sensitivity to IMiDs; conversely, loss of function of CSN9 signalosome activates SCFFbxo7 complex, thereby enhancing degradation of CRBN and conferring IMiD resistance. Finally, we show that pretreatment with either proteasome inhibitors or NEDD8 activating enzyme (NAE) inhibitors can abrogate degradation and maintain levels of CRBN, thereby enhancing sensitivity to IMiDs. These studies therefore demonstrate that CSN9 signalosome complex regulates sensitivity to IMiDs by modulating CRBN expression.
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Affiliation(s)
- Jiye Liu
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Tianyu Song
- School of Life Science and Technology, ShanghaiTech University, Shanghai, China
| | - Wenrong Zhou
- Oncology Business Unit and Innovation Center for Cell Signalling Network, WuXi AppTec Group, Shanghai, China
| | - Lijie Xing
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA.,Department of Hematology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
| | - Su Wang
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Matthew Ho
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Zhengang Peng
- Oncology Business Unit and Innovation Center for Cell Signalling Network, WuXi AppTec Group, Shanghai, China
| | - Yu-Tzu Tai
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Teru Hideshima
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Kenneth C Anderson
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA.
| | - Yong Cang
- School of Life Science and Technology, ShanghaiTech University, Shanghai, China.
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31
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Regulation of Mammalian DNA Replication via the Ubiquitin-Proteasome System. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1042:421-454. [PMID: 29357069 DOI: 10.1007/978-981-10-6955-0_19] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Proper regulation of DNA replication ensures the faithful transmission of genetic material essential for optimal cellular and organismal physiology. Central to this regulation is the activity of a set of enzymes that induce or reverse posttranslational modifications of various proteins critical for the initiation, progression, and termination of DNA replication. This is particularly important when DNA replication proceeds in cancer cells with elevated rates of genomic instability and increased proliferative capacities. Here, we describe how DNA replication in mammalian cells is regulated via the activity of the ubiquitin-proteasome system as well as the consequence of derailed ubiquitylation signaling involved in this important cellular activity.
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32
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Li S, Mao J, Wang M, Zhang M, Ni L, Tao Y, Huang B, Chen J. Comparative proteomic analysis of chief and oxyphil cell nodules in refractory uremic hyperparathyroidism by iTRAQ coupled LC-MS/MS. J Proteomics 2018. [PMID: 29526777 DOI: 10.1016/j.jprot.2018.02.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
SHPT is one of the most common complications of CKD-MBD. Recent studies indicate that oxyphil cell proliferation is related to SHPT progression, while not inhibited by current treatments. The aim of this study was to analyze the correlation between oxyphil cell and clinical indicators in SHPT, further explore the protein expression differences of oxyphil cell. Among 33 MHD patients, 84.8% patients have one or more oxyphil dominant glands and the overall oxyphil cells proportion was 39.5 ± 16.3%. Univariate correlation and multivariable linear regression model showed that oral calcitriol dosage and treatment duration were independently correlated to oxyphil cell ratio. Proteomic study showed that mitochondrial protein, protein synthesis, and cell cycle regulation were significantly altered in oxyphil cell nodules. DBP was downregulated in oxyphil nodules on protein level, which may contribute to calcitriol resistance by reducing vitamin D transport. Through KEGG and PPI network analysis, Wnt signaling, TGF-β, ubiquitin mediated proteolysis and cell cycle pathways were significantly enriched in oxyphil cell nodules. Among which, MIF-CUL1 axis was significantly increased. These results suggest that the limitations of vitamin D in SHPT treatment is closely related to oxyphil cell and may be attributed to the dysregulation of vitamin D transport and ubiquitin regulation of oxyphil cell. SIGNIFICANCE Secondary hyperparathyroidism in end stage renal patients is one of the major challenges nephrology field faces. Emerging data indicate that oxyphil cell may participate in the pathophysiology of secondary hyperparathyroidism, while both calcimimetics and vitamin D receptor activators treatments are underperformed in controlling oxyphil cell proliferation. In the present study, we validated that the proliferation of oxyphil cells is associated with calcitriol treatment, and discovered that oxyphil cell nodules were significantly different from chief cells nodules in protein expression of mitochondria, protein synthesis and cell cycle regulation. It is noteworthy that DBP was downregulated in oxyphil nodules on protein level and may therefore participate in the resistance of calcitriol therapy by reducing the vitamin D transport capacity. Wnt signaling, TGF-β, ubiquitin mediated proteolysis and cell cycle pathways were significantly enriched in oxyphil cell nodules, among which, MIF-CUL1 axis may play an important role in the regulation of oxyphil proliferation and calcitriol resistance through ubiquitin mediated proteolysis. These results suggest that calcitriol treatment has limitations in oxyphil cell predominant SHPT, which may be attributed to the dysregulation of vitamin D transport and ubiquitin regulation of oxyphil cell, and the influence of microenvironment in uremia status may be the underlying reason.
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Affiliation(s)
- Shensen Li
- Division of Nephrology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Jianping Mao
- Division of Nephrology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Mengjing Wang
- Division of Nephrology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Minmin Zhang
- Division of Nephrology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Li Ni
- Division of Nephrology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Ye Tao
- Division of Nursing, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Bihong Huang
- Division of Nursing, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Jing Chen
- Division of Nephrology, Huashan Hospital, Fudan University, Shanghai 200040, China.
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33
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Zhang S, Huang J, Shi T, Hu F, Zhang L, Zhou PK, Ma D, Ma T, Qiu X. DCUN1D3 activates SCFSKP2 ubiquitin E3 ligase activity and cell cycle progression under UV damage. Oncotarget 2018; 7:58483-58491. [PMID: 27542266 PMCID: PMC5295445 DOI: 10.18632/oncotarget.11302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 07/26/2016] [Indexed: 12/20/2022] Open
Abstract
Our previous study showed that knockdown the endogenous expression of DCUN1D3 (also called SCCRO3 or DCNL3) blocked the S phase progression after UV irradiation. Here, we show that the silence of DCUN1D3 can increase the cyclin-dependent kinase inhibitor p27 protein levels after UV irradiation. Through Co-immunoprecipitation experiments, we found that DCUN1D3 bound to CAND1. And DCUN1D3 knockdown synergized with CAND1 over-expression in arresting the S phase. Given the CAND1's established role in Cullin-1 neddylation, we found Cullin-1 was less neddylated in DCUN1D3 deficient cells. So the silence of DCUN1D3 can inhibit the formation of SCFSKP2 complex by reducing Cullin-1 neddylation. Given that p27 is the primary target of SCFSKP2 complex, the cells lost DCUN1D3 showed a remarkable accumulation of p27 to cause S phase block.
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Affiliation(s)
- Shuai Zhang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Jing Huang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Taiping Shi
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China.,Chinese National Human Genome Center, Beijing, China
| | - Fanlei Hu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Li Zhang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Ping-Kun Zhou
- Department of Radiation Toxicology and Oncology, Beijing Key Laboratory for Radiobiology (BKLRB), Beijing Institute of Radiation Medicine, Beijing, P. R. China
| | - Dalong Ma
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Teng Ma
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China.,Department of Radiation Toxicology and Oncology, Beijing Key Laboratory for Radiobiology (BKLRB), Beijing Institute of Radiation Medicine, Beijing, P. R. China
| | - Xiaoyan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
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34
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Orientia tsutsugamushi Modulates Endoplasmic Reticulum-Associated Degradation To Benefit Its Growth. Infect Immun 2017; 86:IAI.00596-17. [PMID: 29109174 DOI: 10.1128/iai.00596-17] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 10/26/2017] [Indexed: 01/11/2023] Open
Abstract
Orientia tsutsugamushi, an obligate intracellular bacterium that is auxotrophic for the aromatic amino acids and histidine, causes scrub typhus, a potentially deadly infection that threatens 1 billion people. O. tsutsugamushi growth is minimal during the first 24 to 48 h of infection but its growth becomes logarithmic thereafter. How the pathogen modulates cellular functions to support its growth is poorly understood. The unfolded protein response (UPR) is a cytoprotective pathway that relieves endoplasmic reticulum (ER) stress by promoting ER-associated degradation (ERAD) of misfolded proteins. Here, we show that O. tsutsugamushi invokes the UPR in the first 48 h and benefits from ER stress in an amino acid-dependent manner. O. tsutsugamushi also impedes ERAD during this time period. By 72 h, ER stress is alleviated and ERAD proceeds unhindered. Sustained inhibition of ERAD using RNA interference results in an O. tsutsugamushi growth defect at 72 h that can be rescued by amino acid supplementation. Thus, O. tsutsugamushi temporally stalls ERAD until ERAD-derived amino acids are needed to support its growth. The O. tsutsugamushi effector Ank4 is linked to this phenomenon. Ank4 interacts with Bat3, a eukaryotic chaperone that is essential for ERAD, and is transiently expressed by O. tsutsugamushi during the infection period when it inhibits ERAD. Ectopically expressed Ank4 blocks ERAD to phenocopy O. tsutsugamushi infection. Our data reveal a novel mechanism by which an obligate intracellular bacterial pathogen modulates ERAD to satisfy its nutritional virulence requirements.
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35
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Qie S, Majumder M, Mackiewicz K, Howley BV, Peterson YK, Howe PH, Palanisamy V, Diehl JA. Fbxo4-mediated degradation of Fxr1 suppresses tumorigenesis in head and neck squamous cell carcinoma. Nat Commun 2017; 8:1534. [PMID: 29142209 PMCID: PMC5688124 DOI: 10.1038/s41467-017-01199-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 08/29/2017] [Indexed: 02/07/2023] Open
Abstract
The Fbxo4 tumour suppressor is a component of an Skp1-Cul1-F-box E3 ligase for which two substrates are known. Here we show purification of SCFFbxo4 complexes results in the identification of fragile X protein family (FMRP, Fxr1 and Fxr2) as binding partners. Biochemical and functional analyses reveal that Fxr1 is a direct substrate of SCFFbxo4. Consistent with a substrate relationship, Fxr1 is overexpressed in Fbxo4 knockout cells, tissues and in human cancer cells, harbouring inactivating Fbxo4 mutations. Critically, in head and neck squamous cell carcinoma, Fxr1 overexpression correlates with reduced Fbxo4 levels in the absence of mutations or loss of mRNA, suggesting the potential for feedback regulation. Direct analysis reveals that Fbxo4 translation is attenuated by Fxr1, indicating the existence of a feedback loop that contributes to Fxr1 overexpression and the loss of Fbxo4. Ultimately, the consequence of Fxr1 overexpression is the bypass of senescence and neoplastic progression.
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MESH Headings
- Amino Acid Sequence
- Animals
- Carcinoma, Squamous Cell/genetics
- Carcinoma, Squamous Cell/metabolism
- Carcinoma, Squamous Cell/pathology
- Cell Line, Tumor
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cells, Cultured
- F-Box Proteins/chemistry
- F-Box Proteins/genetics
- F-Box Proteins/metabolism
- Gene Expression Regulation, Neoplastic
- HEK293 Cells
- Head and Neck Neoplasms/genetics
- Head and Neck Neoplasms/metabolism
- Head and Neck Neoplasms/pathology
- Humans
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- NIH 3T3 Cells
- Protein Binding
- Protein Domains
- RNA Interference
- RNA-Binding Proteins/chemistry
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism
- Sequence Homology, Amino Acid
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Affiliation(s)
- Shuo Qie
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Mrinmoyee Majumder
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
- Department of Oral Health Sciences and Centre for Oral Health Research, College of Dental Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Katarzyna Mackiewicz
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Breege V Howley
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Yuri K Peterson
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Philip H Howe
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Viswanathan Palanisamy
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA
- Department of Oral Health Sciences and Centre for Oral Health Research, College of Dental Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - J Alan Diehl
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, 29425, USA.
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36
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Singh RK, Kazansky Y, Wathieu D, Fushman D. Hydrophobic Patch of Ubiquitin is Important for its Optimal Activation by Ubiquitin Activating Enzyme E1. Anal Chem 2017; 89:7852-7860. [PMID: 28686836 PMCID: PMC5573600 DOI: 10.1021/acs.analchem.6b04194] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Protein ubiquitination plays a role in essentially every process in eukaryotic cells. The attachment of ubiquitin (Ub) or Ub-like (UBL) proteins to target proteins is achieved by parallel but distinct cascades of enzymatic reactions involving three enzymes: E1, E2, and E3. The E1 enzyme functions at the apex of this pathway and plays a critical role in activating the C-terminus of ubiquitin or UBL, which is an essential step that triggers subsequent downstream transfer to their cognate E2s resulting in the fidelity of the Ub/UBL conjugation machinery. Despite the central role of the E1 enzyme in protein modification, a quantitative method to measure Ub/UBL activation by E1 is lacking. Here, we present a mass spectrometry-based assay to accurately measure the activation of Ub/UBL by E1 independent of the E2/E3 enzymes. Our method does not require radiolabeling of any components and therefore can be used in any biochemical laboratory having access to a mass spectrometer. This method allowed us to dissect the concerted process of E1-E2-catalyzed Ub conjugation in order to separately characterize the process of Ub activation and how it is affected by select mutations and other factors. We found that the hydrophobic patch of Ub is important for the optimal activation of Ub by E1. We further show that the blockers of the Ub-proteasome system such as ubistatin and fullerenol inhibit Ub activation by E1. Interestingly, our data indicate that the phosphorylation of Ub at the S65 position augments its activation by the E1 enzyme.
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Affiliation(s)
- Rajesh K Singh
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland , College Park, Maryland 20742, United States
| | - Yaniv Kazansky
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland , College Park, Maryland 20742, United States
| | - Donald Wathieu
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland , College Park, Maryland 20742, United States
| | - David Fushman
- Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland , College Park, Maryland 20742, United States
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37
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STYX: a versatile pseudophosphatase. Biochem Soc Trans 2017; 45:449-456. [PMID: 28408485 DOI: 10.1042/bst20160279] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 02/16/2017] [Accepted: 02/20/2017] [Indexed: 01/12/2023]
Abstract
The pseudophosphatase STYX (serine/threonine/tyrosine interacting protein) is a catalytically inactive member of the protein tyrosine phosphatase family. We perform a phylogenetic analysis of STYX and ask how far does the pseudoenzyme status of STYX reaches in evolution. Based on our previous work, we use STYX as a showcase to discuss four basic modes of action that any given pseudoenzyme may exert. Our previous work on the effect of STYX on mitogen-activated protein kinase (MAPK) signaling led us to identify two complementary modes of action. On the one hand, STYX competes with active phosphatases for binding to MAPKs. On the other hand, STYX acts as a nuclear anchor for MAPKs, affecting their nucleo-cytoplasmic shuttling. Finally, we discuss our recent work on the regulation of FBXW7 by this pseudophosphatase and how it affects the ubiquitylation and degradation of its substrates. We discuss the biological significance of this regulatory mechanism and use it as an example for the versatility of pseudoenzymes that may divert away from merely regulating their active homologs.
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38
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Beyer AR, Rodino KG, VieBrock L, Green RS, Tegels BK, Oliver LD, Marconi RT, Carlyon JA. Orientia tsutsugamushi Ank9 is a multifunctional effector that utilizes a novel GRIP-like Golgi localization domain for Golgi-to-endoplasmic reticulum trafficking and interacts with host COPB2. Cell Microbiol 2017; 19. [PMID: 28103630 DOI: 10.1111/cmi.12727] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 01/17/2017] [Accepted: 01/17/2017] [Indexed: 01/11/2023]
Abstract
Orientia tsutsugamushi causes scrub typhus, a potentially fatal infection that afflicts 1 million people annually. This obligate intracellular bacterium boasts one of the largest microbial arsenals of ankyrin repeat-containing protein (Ank) effectors, most of which target the endoplasmic reticulum (ER) by undefined mechanisms. Ank9 is the only one proven to function during infection. Here, we demonstrate that Ank9 bears a motif that mimics the GRIP domain of eukaryotic golgins and is necessary and sufficient for its Golgi localization. Ank9 reaches the ER exclusively by retrograde trafficking from the Golgi. Consistent with this observation, it binds COPB2, a host protein that mediates Golgi-to-ER transport. Ank9 destabilizes the Golgi and ER in a Golgi localization domain-dependent manner and induces the activating transcription factor 4-dependent unfolded protein response. The Golgi is also destabilized in cells infected with O. tsutsugamushi or treated with COPB2 small interfering RNA. COPB2 reduction and/or the cellular events that it invokes, such as Golgi destabilization, benefit Orientia replication. Thus, Ank9 or bacterial negative modulation of COPB2 might contribute to the bacterium's intracellular replication. This report identifies a novel microbial Golgi localization domain, links Ank9 to the ability of O. tsutsugamushi to perturb Golgi structure, and describes the first mechanism by which any Orientia effector targets the secretory pathway.
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Affiliation(s)
- Andrea R Beyer
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA.,Department of Biology, Virginia State University, Petersburg, VA, USA
| | - Kyle G Rodino
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Lauren VieBrock
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Ryan S Green
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Brittney K Tegels
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA.,Kaztronix, McLean, VA, USA
| | - Lee D Oliver
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Richard T Marconi
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Jason A Carlyon
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
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Patel SP, Randle SJ, Gibbs S, Cooke A, Laman H. Opposing effects on the cell cycle of T lymphocytes by Fbxo7 via Cdk6 and p27. Cell Mol Life Sci 2016; 74:1553-1566. [PMID: 27915416 PMCID: PMC5357273 DOI: 10.1007/s00018-016-2427-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 10/28/2016] [Accepted: 11/21/2016] [Indexed: 11/30/2022]
Abstract
G1 phase cell cycle proteins, such as cyclin-dependent kinase 6 (Cdk6) and its activating partners, the D-type cyclins, are important regulators of T-cell development and function. An F-box protein, called F-box only protein 7 (Fbxo7), acts as a cell cycle regulator by enhancing cyclin D-Cdk6 complex formation and stabilising levels of p27, a cyclin-dependent kinase inhibitor. We generated a murine model of reduced Fbxo7 expression to test its physiological role in multiple tissues and found that these mice displayed a pronounced thymic hypoplasia. Further analysis revealed that Fbxo7 differentially affected proliferation and apoptosis of thymocytes at various stages of differentiation in the thymus and also mature T-cell function and proliferation in the periphery. Paradoxically, Fbxo7-deficient immature thymocytes failed to undergo expansion in the thymus due to a lack of Cdk6 activity, while mature T cells showed enhanced proliferative capacity upon T-cell receptor engagement due to reduced p27 levels. Our studies reveal differential cell cycle regulation by Fbxo7 at different stages in T-cell development.
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Affiliation(s)
- Shachi P Patel
- Department of Pathology, University of Cambridge, Cambridge, UK
| | | | - Sarah Gibbs
- Department of Pathology, University of Cambridge, Cambridge, UK
| | - Anne Cooke
- Department of Pathology, University of Cambridge, Cambridge, UK
| | - Heike Laman
- Department of Pathology, University of Cambridge, Cambridge, UK.
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Qie S, Diehl JA. Cyclin D1, cancer progression, and opportunities in cancer treatment. J Mol Med (Berl) 2016; 94:1313-1326. [PMID: 27695879 PMCID: PMC5145738 DOI: 10.1007/s00109-016-1475-3] [Citation(s) in RCA: 462] [Impact Index Per Article: 57.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 09/06/2016] [Accepted: 09/13/2016] [Indexed: 12/15/2022]
Abstract
Mammalian cells encode three D cyclins (D1, D2, and D3) that coordinately function as allosteric regulators of cyclin-dependent kinase 4 (CDK4) and CDK6 to regulate cell cycle transition from G1 to S phase. Cyclin expression, accumulation, and degradation, as well as assembly and activation of CDK4/CDK6 are governed by growth factor stimulation. Cyclin D1 is more frequently dysregulated than cyclin D2 or D3 in human cancers, and as such, it has been more extensively characterized. Overexpression of cyclin D1 results in dysregulated CDK activity, rapid cell growth under conditions of restricted mitogenic signaling, bypass of key cellular checkpoints, and ultimately, neoplastic growth. This review discusses cyclin D1 transcriptional, translational, and post-translational regulations and its biological function with a particular focus on the mechanisms that result in its dysregulation in human cancers.
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Affiliation(s)
- Shuo Qie
- Department of Biochemistry and Molecular Biology, Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas St, Charleston, SC, 29425, USA
| | - J Alan Diehl
- Department of Biochemistry and Molecular Biology, Hollings Cancer Center, Medical University of South Carolina, 86 Jonathan Lucas St, Charleston, SC, 29425, USA.
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Ortiz A, Husi H, Gonzalez-Lafuente L, Valiño-Rivas L, Fresno M, Sanz AB, Mullen W, Albalat A, Mezzano S, Vlahou T, Mischak H, Sanchez-Niño MD. Mitogen-Activated Protein Kinase 14 Promotes AKI. J Am Soc Nephrol 2016; 28:823-836. [PMID: 27620989 DOI: 10.1681/asn.2015080898] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Accepted: 07/28/2016] [Indexed: 01/20/2023] Open
Abstract
An improved understanding of pathogenic pathways in AKI may identify novel therapeutic approaches. Previously, we conducted unbiased liquid chromatography-tandem mass spectrometry-based protein expression profiling of the renal proteome in mice with acute folate nephropathy. Here, analysis of the dataset identified enrichment of pathways involving NFκB in the kidney cortex, and a targeted data mining approach identified components of the noncanonical NFκB pathway, including the upstream kinase mitogen-activated protein kinase kinase kinase 14 (MAP3K14), the NFκB DNA binding heterodimer RelB/NFκB2, and proteins involved in NFκB2 p100 ubiquitination and proteasomal processing to p52, as upregulated. Immunohistochemistry localized MAP3K14 expression to tubular cells in acute folate nephropathy and human AKI. In vivo, kidney expression levels of NFκB2 p100 and p52 increased rapidly after folic acid injection, as did DNA binding of RelB and NFκB2, detected in nuclei isolated from the kidneys. Compared with wild-type mice, MAP3K14 activity-deficient aly/aly (MAP3K14aly/aly) mice had less kidney dysfunction, inflammation, and apoptosis in acute folate nephropathy and less kidney dysfunction and a lower mortality rate in cisplatin-induced AKI. The exchange of bone marrow between wild-type and MAP3K14aly/aly mice did not affect the survival rate of either group after folic acid injection. In cultured tubular cells, MAP3K14 small interfering RNA targeting decreased inflammation and cell death. Additionally, cell culture and in vivo studies identified the chemokines MCP-1, RANTES, and CXCL10 as MAP3K14 targets in tubular cells. In conclusion, MAP3K14 promotes kidney injury through promotion of inflammation and cell death and is a promising novel therapeutic target.
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Affiliation(s)
- Alberto Ortiz
- Instituto Investigacion Sanitaria-Fundacion Jimenez Diaz-Universidad Autonoma de Madrid and Fundacion Renal Iñigo Alvarez de Toledo-Instituto Reina Sofia de Investigacion Nefrologica, Madrid, Spain; .,Red de Investigacion Rena, Madrid, Spain
| | - Holger Husi
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Laura Gonzalez-Lafuente
- Instituto Investigacion Sanitaria-Fundacion Jimenez Diaz-Universidad Autonoma de Madrid and Fundacion Renal Iñigo Alvarez de Toledo-Instituto Reina Sofia de Investigacion Nefrologica, Madrid, Spain.,Red de Investigacion Rena, Madrid, Spain
| | - Lara Valiño-Rivas
- Instituto Investigacion Sanitaria-Fundacion Jimenez Diaz-Universidad Autonoma de Madrid and Fundacion Renal Iñigo Alvarez de Toledo-Instituto Reina Sofia de Investigacion Nefrologica, Madrid, Spain.,Red de Investigacion Rena, Madrid, Spain
| | - Manuel Fresno
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas de la Universidad Autonoma de Madrid, Madrid, Spain
| | - Ana Belen Sanz
- Instituto Investigacion Sanitaria-Fundacion Jimenez Diaz-Universidad Autonoma de Madrid and Fundacion Renal Iñigo Alvarez de Toledo-Instituto Reina Sofia de Investigacion Nefrologica, Madrid, Spain.,Mosaiques diagnostics GmbH, Hannover, Germany
| | - William Mullen
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Amaya Albalat
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Sergio Mezzano
- Unidad de Nefrología, Instituto de Medicina, Universidad Austral de Chile, Valdivia, Chile; and
| | - Tonia Vlahou
- Biomedical Research Foundation Academy of Athens, Athens, Greece
| | - Harald Mischak
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom.,Mosaiques diagnostics GmbH, Hannover, Germany
| | - Maria Dolores Sanchez-Niño
- Instituto Investigacion Sanitaria-Fundacion Jimenez Diaz-Universidad Autonoma de Madrid and Fundacion Renal Iñigo Alvarez de Toledo-Instituto Reina Sofia de Investigacion Nefrologica, Madrid, Spain; .,Red de Investigacion Rena, Madrid, Spain
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FBXO31 protects against genomic instability by capping FOXM1 levels at the G2/M transition. Oncogene 2016; 36:1012-1022. [PMID: 27568981 DOI: 10.1038/onc.2016.268] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 06/05/2016] [Accepted: 06/13/2016] [Indexed: 12/16/2022]
Abstract
F-box proteins in conjunction with Skp1, Cul1 and Rbx1 generate SCF complexes that are responsible for the ubiquitination of proteins, leading to their activation or degradation. Here we show that the F-box protein FBXO31 is required for normal mitotic progression and genome stability due to its role in regulating FOXM1 levels during the G2/M transition. FBXO31-depleted cells undergo a transient delay in mitosis due to an activated spindle checkpoint concomitant with an increase in lagging chromosomes and anaphase bridges. FBXO31 regulates mitosis in part by controlling the levels of FOXM1, a transcription factor and master regulator of mitosis. FBXO31 specifically interacts with FOXM1 during the G2/M transition, resulting in FOXM1 ubiquitination and degradation. FBXO31 depletion results in increased expression of FOXM1 transcriptional targets and mimics the FOXM1 overexpression. In contrast, co-depletion of FBXO31 and FOXM1 restores the genomic instability phenotype but not the delay in mitosis, indicating that FBXO31 probably has additional mitotic substrates. Thus, FBXO31 is the first described negative regulator of FOXM1 during the G2/M transition.
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Gsk3β and Tomm20 are substrates of the SCFFbxo7/PARK15 ubiquitin ligase associated with Parkinson's disease. Biochem J 2016; 473:3563-3580. [PMID: 27503909 PMCID: PMC5260939 DOI: 10.1042/bcj20160387] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/08/2016] [Indexed: 12/15/2022]
Abstract
Fbxo7 is a clinically relevant F-box protein, associated with both cancer and Parkinson's disease (PD). Additionally, SNPs within FBXO7 are correlated with alterations in red blood cell parameters. Point mutations within FBXO7 map within specific functional domains, including near its F-box domain and its substrate recruiting domains, suggesting that deficiencies in SCFFbxo7/PARK15 ubiquitin ligase activity are mechanistically linked to early-onset PD. To date, relatively few substrates of the ligase have been identified. These include HURP (hepatoma up-regulated protein), whose ubiquitination results in proteasome-mediated degradation, and c-IAP1 (inhibitor of apoptosis protein 1), TNF receptor-associated factor 2 (TRAF2), and NRAGE, which are not destabilized as a result of ubiquitination. None of these substrates have been linked directly to PD, nor has it been determined whether they would directly engage neuronal cell death pathways. To discover ubiquitinated substrates of SCFFbxo7 implicated more directly in PD aetiology, we conducted a high-throughput screen using protein arrays to identify new candidates. A total of 338 new targets were identified and from these we validated glycogen synthase kinase 3β (Gsk3β), which can phosphorylate α-synuclein, and translocase of outer mitochondrial membrane 20 (Tomm20), a mitochondrial translocase that, when ubiquitinated, promotes mitophagy, as SCFFbxo7 substrates both in vitro and in vivo. Ubiquitin chain restriction analyses revealed that Fbxo7 modified Gsk3β using K63 linkages. Our results indicate that Fbxo7 negatively regulates Gsk3β activity, rather than its levels or localization. In addition, Fbxo7 ubiquitinated Tomm20, and its levels correlated with Fbxo7 expression, indicating a stabilizing effect. None of the PD-associated mutations in Fbxo7 impaired Tomm20 ubiquitination. Our findings demonstrate that SCFFbxo7 has an impact directly on two proteins implicated in pathological processes leading to PD.
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Hernández-Ramírez LC, Martucci F, Morgan RML, Trivellin G, Tilley D, Ramos-Guajardo N, Iacovazzo D, D'Acquisto F, Prodromou C, Korbonits M. Rapid Proteasomal Degradation of Mutant Proteins Is the Primary Mechanism Leading to Tumorigenesis in Patients With Missense AIP Mutations. J Clin Endocrinol Metab 2016; 101:3144-54. [PMID: 27253664 PMCID: PMC4971335 DOI: 10.1210/jc.2016-1307] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
CONTEXT The pathogenic effect of mutations in the aryl hydrocarbon receptor interacting protein (AIP) gene (AIPmuts) in pituitary adenomas is incompletely understood. We have identified the primary mechanism of loss of function for missense AIPmuts. OBJECTIVE This study sought to analyze the mechanism/speed of protein turnover of wild-type and missense AIP variants, correlating protein half-life with clinical parameters. DESIGN AND SETTING Half-life and protein-protein interaction experiments and cross-sectional analysis of AIPmut positive patients' data were performed in a clinical academic research institution. PATIENTS Data were obtained from our cohort of pituitary adenoma patients and literature-reported cases. INTERVENTIONS Protein turnover of endogenous AIP in two cell lines and fifteen AIP variants overexpressed in HEK293 cells was analyzed via cycloheximide chase and proteasome inhibition. Glutathione-S-transferase pull-down and quantitative mass spectrometry identified proteins involved in AIP degradation; results were confirmed by coimmunoprecipitation and gene knockdown. Relevant clinical data was collected. MAIN OUTCOME MEASURES Half-life of wild-type and mutant AIP proteins and its correlation with clinical parameters. RESULTS Endogenous AIP half-life was similar in HEK293 and lymphoblastoid cells (43.5 and 32.7 h). AIP variants were divided into stable proteins (median, 77.7 h; interquartile range [IQR], 60.7-92.9 h), and those with short (median, 27 h; IQR, 21.6-28.7 h) or very short (median, 7.7 h; IQR, 5.6-10.5 h) half-life; proteasomal inhibition rescued the rapid degradation of mutant proteins. The experimental half-life significantly correlated with age at diagnosis of acromegaly/gigantism (r = 0.411; P = .002). The FBXO3-containing SKP1-CUL1-F-box protein complex was identified as the E3 ubiquitin-ligase recognizing AIP. CONCLUSIONS AIP is a stable protein, driven to ubiquitination by the SKP1-CUL1-F-box protein complex. Enhanced proteasomal degradation is a novel pathogenic mechanism for AIPmuts, with direct implications for the phenotype.
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Affiliation(s)
- Laura C Hernández-Ramírez
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Federico Martucci
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Rhodri M L Morgan
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Giampaolo Trivellin
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Daniel Tilley
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Nancy Ramos-Guajardo
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Donato Iacovazzo
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Fulvio D'Acquisto
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Chrisostomos Prodromou
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
| | - Márta Korbonits
- Centre for Endocrinology (L.C.H.-R., F.M., G.T., D.T., N.R.-G., D.I., M.K.), and Centre for Biochemical Pharmacology (F.D.), William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, London, EC1M 6BQ, United Kingdom; Genome Damage and Stability Centre (R.M.L.M., C.P.), University of Sussex, Brighton, Falmer, BN1 9RQ, United Kingdom
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Varnaitė R, MacNeill SA. Meet the neighbors: Mapping local protein interactomes by proximity-dependent labeling with BioID. Proteomics 2016; 16:2503-2518. [PMID: 27329485 PMCID: PMC5053326 DOI: 10.1002/pmic.201600123] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/23/2016] [Accepted: 06/16/2016] [Indexed: 12/13/2022]
Abstract
Proximity-dependent biotin identification (BioID) is a recently developed method that allows the identification of proteins in the close vicinity of a protein of interest in living cells. BioID relies on fusion of the protein of interest with a mutant form of the biotin ligase enzyme BirA (BirA*) that is capable of promiscuously biotinylating proximal proteins irrespective of whether these interact directly or indirectly with the fusion protein or are merely located in the same subcellular neighborhood. The covalent addition of biotin allows the labeled proteins to be purified from cell extracts on the basis of their affinity for streptavidin and identified by mass spectrometry. To date, BioID has been successfully applied to study a variety of proteins and processes in mammalian cells and unicellular eukaryotes and has been shown to be particularly suited to the study of insoluble or inaccessible cellular structures and for detecting weak or transient protein associations. Here, we provide an introduction to BioID, together with a detailed summary of where and how the method has been applied to date, and briefly discuss technical aspects involved in the planning and execution of a BioID study.
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Affiliation(s)
- Renata Varnaitė
- School of Biology, University of St Andrews, North Haugh, St Andrews, Scotland, UK
| | - Stuart A MacNeill
- School of Biology, University of St Andrews, North Haugh, St Andrews, Scotland, UK.
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Uddin S, Bhat AA, Krishnankutty R, Mir F, Kulinski M, Mohammad RM. Involvement of F-BOX proteins in progression and development of human malignancies. Semin Cancer Biol 2016; 36:18-32. [PMID: 26410033 DOI: 10.1016/j.semcancer.2015.09.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 09/15/2015] [Accepted: 09/15/2015] [Indexed: 12/13/2022]
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Vriend J, Reiter RJ. Breast cancer cells: Modulation by melatonin and the ubiquitin-proteasome system--a review. Mol Cell Endocrinol 2015; 417:1-9. [PMID: 26363225 DOI: 10.1016/j.mce.2015.09.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 09/01/2015] [Indexed: 02/07/2023]
Abstract
Melatonin inhibits human breast cancer cells stimulated with estrogen. This antiproliferative action depends on the presence of the estrogen receptor alpha (ERα) in the human MCF-7 cell line and is strictly dose-dependent. Since researchers concerned with melatonin and breast cancer have not considered the relevance of the ubiquitin-proteasome system to this research in this review we do so. The fact that the first breast cancer susceptibility gene to be identified, Brca1, functions as a ubiquitin ligase indicates that the ubiquitin-proteasome system has a role in regulating susceptibility to breast cancer. While mutations of this gene increase the incidence of breast cancer, the wild type gene suppresses estrogen-dependent transcriptional events relying on the estrogen receptor ERα. Three other ubiquitin ligases, SCF(Skp2), E6AP and APC, interact directly with ERα at the ERE and AP-1 promoters of ERα target genes. Melatonin, like proteasome inhibitors, decreases estrogen-induced gene transcription. Indeed, it has been reported that melatonin specifically inhibits estrogen-induced transcription mediated by ERα at the ERE and AP1 gene promoters. Herein, we present a model in which the inhibitory action of melatonin on MCF-7 cells is mediated, directly or indirectly, by the ubiquitin-proteasome system. In this model ERα, apoptotic proteins, and cell cycle proteins, all influenced by melatonin, are substrates of key ubiquitin ligases including SCF(Skp2), E6AP, and SCF(B-TrCP). Since dysfunction of the ubiquitin-proteasome system is a risk factor for breast cancer, this model provides a context in which to test the clinical potential, and limitations, of melatonin and proteasome inhibitors.
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Affiliation(s)
- Jerry Vriend
- Department of Human Anatomy and Cell Science, University of Manitoba, Winnipeg, MB, Canada.
| | - Russel J Reiter
- Department of Cellular and Structural Biology, UT Health Science Center San Antonio, TX, USA
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Chen P, Yao GD. The role of cullin proteins in gastric cancer. Tumour Biol 2015; 37:29-37. [PMID: 26472722 DOI: 10.1007/s13277-015-4154-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 09/23/2015] [Indexed: 01/09/2023] Open
Abstract
The cullin proteins are a family of scaffolding proteins that associate with RING proteins and ubiquitin E3 ligases and mediate substrate-receptor bindings. Thus, cullin proteins regulate the specificity of ubiquitin targeting in the regulation of proteins involved in various cellular processes, including proliferation, differentiation, and apoptosis. There are seven cullin proteins that have been identified in eukaryotes: CUL1, CUL2, CUL3, CUL4A, CUL4B, CUL5, and CUL7/p53-associated parkin-like cytoplasmic protein. All of these proteins contain a conserved cullin homology domain that binds to RING box proteins. Cullin-RING ubiquitin ligase complexes are activated upon post-translational modification by neural precursor cell-expressed, developmentally downregulated protein 8. The aberrant expression of several cullin proteins has been implicated in many cancers though the significance in gastric cancer has been less well investigated. This review provides the first systematic discussion of the associations between all members of the cullin protein family and gastric cancer. Functional and regulatory mechanisms of cullin proteins in gastric carcinoma progression are also summarized along with a discussion concerning future research areas. Accumulating evidence suggests a critical role of cullin proteins in tumorigenesis, and a better understanding of the function of these individual cullin proteins and their targets will help identify potential biomarkers and therapeutic targets.
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Affiliation(s)
- Peng Chen
- Department of General Surgery, The Affiliated Hospital of Inner Mongolia Medical University, Tong-Dao-Bei Street, Hohhot, Inner Mongolia, 010050, People's Republic of China
| | - Guo-Dong Yao
- Department of General Surgery, The Affiliated Hospital of Inner Mongolia Medical University, Tong-Dao-Bei Street, Hohhot, Inner Mongolia, 010050, People's Republic of China.
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Randle SJ, Laman H. F-box protein interactions with the hallmark pathways in cancer. Semin Cancer Biol 2015; 36:3-17. [PMID: 26416465 DOI: 10.1016/j.semcancer.2015.09.013] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 09/18/2015] [Accepted: 09/23/2015] [Indexed: 12/24/2022]
Abstract
F-box proteins (FBP) are the substrate specifying subunit of Skp1-Cul1-FBP (SCF)-type E3 ubiquitin ligases and are responsible for directing the ubiquitination of numerous proteins essential for cellular function. Due to their ability to regulate the expression and activity of oncogenes and tumour suppressor genes, FBPs themselves play important roles in cancer development and progression. In this review, we provide a comprehensive overview of FBPs and their targets in relation to their interaction with the hallmarks of cancer cell biology, including the regulation of proliferation, epigenetics, migration and invasion, metabolism, angiogenesis, cell death and DNA damage responses. Each cancer hallmark is revealed to have multiple FBPs which converge on common signalling hubs or response pathways. We also highlight the complex regulatory interplay between SCF-type ligases and other ubiquitin ligases. We suggest six highly interconnected FBPs affecting multiple cancer hallmarks, which may prove sensible candidates for therapeutic intervention.
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Affiliation(s)
- Suzanne J Randle
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, United Kingdom
| | - Heike Laman
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, United Kingdom.
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Wang H, Maitra A, Wang H. The emerging roles of F-box proteins in pancreatic tumorigenesis. Semin Cancer Biol 2015; 36:88-94. [PMID: 26384530 DOI: 10.1016/j.semcancer.2015.09.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 09/13/2015] [Indexed: 11/24/2022]
Abstract
The role of F-box proteins in pancreatic tumorigenesis is emerging owing to their pivotal and indispensable roles in cell differentiation, cell cycle regulation and proliferation. In this review, we will focus on β-TrCP (β-transducin repeat-containing protein) and two other prototypical mammalian F-box proteins, Fbxw7 and Fbxw8, in pancreatic tumorigenesis and progression. We will highlight the functions and regulation of these F-box proteins, their respective substrates and cross-talks with other key signaling pathways, such as the Ras-Raf-Mek-Erk, Hedgehog, NFκB, TGF-β, Myc and HPK1 signaling pathways in pancreatic cancer.
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Affiliation(s)
- Hua Wang
- Department of Gastrointestinal Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, United States
| | - Anirban Maitra
- Department of Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, United States; Department of Translational Molecular Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, United States
| | - Huamin Wang
- Department of Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, United States; Department of Translational Molecular Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, United States.
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