101
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Liu J, Wang Y, Gong Y, Fu T, Hu S, Zhou Z, Pan L. Structural Insights into SHARPIN-Mediated Activation of HOIP for the Linear Ubiquitin Chain Assembly. Cell Rep 2018; 21:27-36. [PMID: 28978479 DOI: 10.1016/j.celrep.2017.09.031] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/15/2017] [Accepted: 09/07/2017] [Indexed: 11/25/2022] Open
Abstract
The linear ubiquitin chain assembly complex (LUBAC) is the sole identified E3 ligase complex that catalyzes the formation of linear ubiquitin chain, and it is composed of HOIP, HOIL-1L, and SHARPIN. The E3 activity of HOIP can be effectively activated by HOIL-1L or SHARPIN, deficiency of which leads to severe immune system disorders. However, the underlying mechanism governing the HOIP-SHARPIN interaction and the SHARPIN-mediated activation of HOIP remains elusive. Here, we biochemically and structurally demonstrate that the UBL domain of SHARPIN specifically binds to the UBA domain of HOIP and thereby associates with and activates HOIP. We further uncover that SHARPIN and HOIL-1L can separately or synergistically bind to distinct sites of HOIP UBA with induced allosteric effects and thereby facilitate the E2 loading of HOIP for its activation. Thus, our findings provide mechanistic insights into the assembly and activation of LUBAC.
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Affiliation(s)
- Jianping Liu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China
| | - Yingli Wang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China
| | - Yukang Gong
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China
| | - Tao Fu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China
| | - Shichen Hu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China
| | - Zixuan Zhou
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China
| | - Lifeng Pan
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China.
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102
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Jiang TX, Zhao M, Qiu XB. Substrate receptors of proteasomes. Biol Rev Camb Philos Soc 2018; 93:1765-1777. [DOI: 10.1111/brv.12419] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 03/26/2018] [Accepted: 03/28/2018] [Indexed: 01/01/2023]
Affiliation(s)
- Tian-Xia Jiang
- State Key Laboratory of Cognitive Neuroscience & Learning and Ministry of Education Key Laboratory of Cell Proliferation & Regulation Biology, College of Life Sciences; Beijing Normal University, 19 Xinjiekouwai Avenue; Beijing 100875 China
| | - Mei Zhao
- State Key Laboratory of Cognitive Neuroscience & Learning and Ministry of Education Key Laboratory of Cell Proliferation & Regulation Biology, College of Life Sciences; Beijing Normal University, 19 Xinjiekouwai Avenue; Beijing 100875 China
| | - Xiao-Bo Qiu
- State Key Laboratory of Cognitive Neuroscience & Learning and Ministry of Education Key Laboratory of Cell Proliferation & Regulation Biology, College of Life Sciences; Beijing Normal University, 19 Xinjiekouwai Avenue; Beijing 100875 China
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103
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Miyamoto K, Saito K. Concise machinery for monitoring ubiquitination activities using novel artificial RING fingers. Protein Sci 2018; 27:1354-1363. [PMID: 29663561 DOI: 10.1002/pro.3427] [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] [Received: 03/07/2018] [Revised: 04/11/2018] [Accepted: 04/11/2018] [Indexed: 01/20/2023]
Abstract
Protein ubiquitination is involved in many cellular processes, such as protein degradation, DNA repair, and signal transduction pathways. Ubiquitin-conjugating (E2) enzymes of the ubiquitination pathway are associated with various cancers, such as leukemia, lung cancer, and gastric cancer. However, to date, detection of E2 activities is not practicable for capturing the pathological conditions of cancers due to complications related to the enzymatic cascade reaction. To overcome this hurdle, we have recently investigated a novel strategy for measuring E2 activities. Artificial RING fingers (ARFs) were developed to conveniently detect E2 activities during the ubiquitination reaction. ARFs were created by grafting the active sites of ubiquitin-ligating (E3) enzymes onto amino acid sequences with 38 residues. The grafting design downsized E3s to small molecules (ARFs). Such an ARF is a multifunctional molecule that possesses specific E2-binding capabilities and ubiquitinates itself without a substrate. In this review, we discuss the major findings from recent investigations on a new molecular design for ARFs and their simplified detection system for E2 activities. The use of the ARF allowed us to monitor E2 activities using acute promyelocytic leukemia (APL)-derived cells following treatment with the anticancer drug bortezomib. The molecular design of ARFs is extremely simple and convenient, and thus, may be a powerful tool for protein engineering. The ARF methodology may reveal a new screening method of E2s that will contribute to diagnostic techniques for cancers.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
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104
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Zhao H, Wang S, Liu C, Han J, Tang J, Zhou L, Ge X, Guo X, Yang H. The pUL56 of pseudorabies virus variant induces downregulation of swine leukocyte antigen class I molecules through the lysosome pathway. Virus Res 2018; 251:56-67. [PMID: 29634995 DOI: 10.1016/j.virusres.2018.04.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/05/2018] [Accepted: 04/05/2018] [Indexed: 11/17/2022]
Abstract
Pseudorabies virus (PRV) is the causative agent of pseudorabies (PR) which causes large economic losses for Chinese swine industry since breaking out in late 2011. As a member of herpesviruses, PRV is able to escape the host immune elimination and establish latency, resulting in persistent infection. Here, we report that a currently prevalent Chinese PRV variant down-regulated swine leukocyte antigen class I (SLA-I) molecules on the surface of PK-15 cells and targeted them for degradation through lysosome pathway. Viral pUL56 protein, independent of other viral proteins, was associated with this function by inducing degradation of cellular SLA-I heavy chain (HC) in a manner that was dependent on the lysosome machinery. In addition, pUL56 interacted with SLA-I HC and increased its ubiquitination. Further studies demonstrated that the late domains (PPXY motifs) of pUL56 were required for the ubiquitination and degradation of SLA-I HC by pUL56. Together, our findings reveal the mechanisms by which PRV interferes with cytotoxic T lymphocyte (CTL) responses and provide novel insights into the roles of PRV pUL56.
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Affiliation(s)
- Hongyuan Zhao
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Shujie Wang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Chu Liu
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Jun Han
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Jun Tang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Lei Zhou
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Xinna Ge
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Xin Guo
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China.
| | - Hanchun Yang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, People's Republic of China
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105
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Gu Y, Wang JM, Zhang ZF, Wang J, Cao YL, Pan CJ, Yin LR, Du J. The association between polymorphisms of genes related to inflammation and recurrent pregnancy loss. Gynecol Endocrinol 2018; 34:349-352. [PMID: 29084471 DOI: 10.1080/09513590.2017.1395837] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
AIM Recurrent pregnancy loss (RPL) occurs in 1-2% of pregnant women and about 50% of RPL cases are unexplained. Previous studies have shown that genetic variation in immune response genes can contribute to the risk in pregnancy maintenance during pregnancy. The aim of the present study was to evaluate the relationship between RPL and genes those have previously been associated with an inflammatory process on 107 RPL cases and 187 healthy controls. METHODS In this work, the single-nucleotide polymorphisms was examined by utilizing the direct sequencing and the Sequenom MassARRAY system. RESULTS The FAU rs769440 G allele had higher frequencies in patients with RPL (p = .019). No association was observed between other polymorphisms and RPL. CONCLUSION The results showed an association between FAU rs769440 polymorphism and RPL in Chinese Han population.
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Affiliation(s)
- Yan Gu
- a The Second Hospital of Tianjin Medical University , Tianjin , China
| | - Jian Mei Wang
- a The Second Hospital of Tianjin Medical University , Tianjin , China
| | - Zhao Feng Zhang
- b Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD , Fudan University , Shanghai , China
| | - Jian Wang
- b Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD , Fudan University , Shanghai , China
| | - Yun Lei Cao
- b Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD , Fudan University , Shanghai , China
| | - Cai Jun Pan
- a The Second Hospital of Tianjin Medical University , Tianjin , China
| | - Li Rong Yin
- a The Second Hospital of Tianjin Medical University , Tianjin , China
| | - Jing Du
- b Key Laboratory of Reproduction Regulation of NPFPC, SIPPR, IRD , Fudan University , Shanghai , China
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106
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Carrier M, Lutzing R, Gaouar S, Rochette-Egly C. TRIM24 mediates the interaction of the retinoic acid receptor alpha with the proteasome. FEBS Lett 2018; 592:1426-1433. [PMID: 29543331 DOI: 10.1002/1873-3468.13033] [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: 01/12/2018] [Revised: 02/16/2018] [Accepted: 02/16/2018] [Indexed: 12/17/2022]
Abstract
The nuclear retinoic acid (RA) receptors (RARα, β and γ) are ligand-dependent regulators of transcription. Upon activation by RA, they are recruited at the promoters of target genes together with several coregulators. Then, they are degraded by the ubiquitin proteasome system. Here, we report that the degradation of the RARα subtype involves ubiquitination and the tripartite motif protein TRIM24, which was originally identified as a ligand-dependent corepressor of RARα. We show that in response to RA, TRIM24 serves as an adapter linking RARα to the proteasome for its degradation. In addition, TRIM24 and the proteasome are recruited with RARα to the promoters of target genes and thus are inherently linked to RARα transcriptional activity.
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Affiliation(s)
- Marilyn Carrier
- Department of Functional Genomics and Cancer, IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), INSERM, U964, CNRS, UMR7104, Université de Strasbourg, Illkirch Cedex, France
| | - Regis Lutzing
- Department of Functional Genomics and Cancer, IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), INSERM, U964, CNRS, UMR7104, Université de Strasbourg, Illkirch Cedex, France
| | - Samia Gaouar
- Department of Functional Genomics and Cancer, IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), INSERM, U964, CNRS, UMR7104, Université de Strasbourg, Illkirch Cedex, France
| | - Cécile Rochette-Egly
- Department of Functional Genomics and Cancer, IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), INSERM, U964, CNRS, UMR7104, Université de Strasbourg, Illkirch Cedex, France
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107
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Rider V, Abdou NI, Kimler BF, Lu N, Brown S, Fridley BL. Gender Bias in Human Systemic Lupus Erythematosus: A Problem of Steroid Receptor Action? Front Immunol 2018; 9:611. [PMID: 29643853 PMCID: PMC5882779 DOI: 10.3389/fimmu.2018.00611] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 03/12/2018] [Indexed: 12/31/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is a chronic systemic autoimmune disease resulting from abnormal interactions between T and B cells. The acquisition of SLE is linked to genetic susceptibility, and diverse environmental agents can trigger disease onset in genetically susceptible individuals. However, the strongest risk factor for developing SLE is being female (9:1 female to male ratio). The female sex steroid, estradiol, working through its receptors, contributes to the gender bias in SLE although the mechanisms remain enigmatic. In a small clinical trial, monthly administration of the estrogen receptor (ERα) antagonist, ICI182,780 (fulvestrant), significantly reduced disease indicators in SLE patients. In order to identify changes that could account for improved disease status, the present study utilized fulvestrant (Faslodex) to block ERα action in cultured SLE T cells that were purified from blood samples collected from SLE patients (n = 18, median age 42 years) and healthy control females (n = 25, median age 46 years). The effects of ERα antagonism on estradiol-dependent gene expression and canonical signaling pathways were analyzed. Pathways that were significantly altered by addition of Faslodex included T helper (Th) cell differentiation, steroid receptor signaling [glucocorticoid receptor (GR), ESR1 (ERα)], ubiquitination, and sumoylation pathways. ERα protein expression was significantly lower (p < 0.018) in freshly isolated, resting SLE T cells suggesting ERα turnover is inherently faster in SLE T cells. In contrast, ERα/ERβ mRNA and ERβ protein levels were not significantly different between SLE and normal control T cell samples. Plasma estradiol levels did not differ (p > 0.05) between SLE patients and controls. A previously undetected interaction between GR and ERα signaling pathways suggests posttranslational modification of steroid receptors in SLE T cells may alter ERα/GR actions and contribute to the strong gender bias of this autoimmune disorder.
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Affiliation(s)
- Virginia Rider
- Department of Biology, Pittsburg State University, Pittsburg, KS, United States
| | - Nabih I Abdou
- Center for Rheumatic Diseases, St. Luke's Hospital, Kansas City, MO, United States
| | - Bruce F Kimler
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, MO, United States
| | - Nanyan Lu
- Division of Biology, Kansas State University, Manhattan, KS, United States
| | - Susan Brown
- Division of Biology, Kansas State University, Manhattan, KS, United States
| | - Brooke L Fridley
- Department of Biostatistics, University of Kansas Medical Center, Kansas City, MO, United States
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108
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Abstract
Nedd4 is a family of ubiquitin E3 ligases that regulate numerous cellular processes. In this report, we showed that alpha- and beta-herpesviruses have membrane proteins that regulate the function of the Nedd4 family members. Although the homology search score was quite low, UL56 of herpes simplex virus type 1 and 2, ORF0 of varicella-zoster virus, UL42 of human cytomegalovirus, and U24 of human herpesvirus 6A, 6B, and 7 all possess at least one PPxY (PY) motif in their cytoplasmic domain, and are able to bind with Itch, a member of the Nedd4 family. These viral proteins altered the localization of Itch and decreased Itch expression in co-expressing cells. In addition, these viral proteins reduced the production of retrovirus vectors through the regulation of the Nedd4 family of proteins. U24, but not the other proteins, effectively reduced CD3ε expression on the T cell surface. These viral molecules are thought to contribute to the specific function of each virus through the regulation of Nedd4 family activity.
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109
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Shen JD, Fu SZ, Ju LL, Wang YF, Dai F, Liu ZX, Ji HZ, Shao JG, Bian ZL. High expression of ubiquitin-conjugating enzyme E2A predicts poor prognosis in hepatocellular carcinoma. Oncol Lett 2018; 15:7362-7368. [PMID: 29725449 DOI: 10.3892/ol.2018.8189] [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: 08/16/2017] [Accepted: 02/01/2018] [Indexed: 12/11/2022] Open
Abstract
The present study aimed to illustrate the association of the expression of ubiquitin-conjugating enzyme E2A (UBE2A) with the clinicopathological parameters and prognosis in hepatocellular carcinoma (HCC). The expression levels of UBE2A mRNA and protein in a total of 276 HCC tissues and six liver cell lines was detected by fluorescent quantitative polymerase chain reaction, western blotting and immunohistochemistry. Statistical analysis was also performed to assess the association of the expression of UBE2A with the clinicopathological parameters and prognosis by the GraphPad Prism and SPSS version 21.0 software. UBE2A mRNA and protein were highly expressed in HCC tissues compared with those in the adjacent normal tissue. Immunohistochemical analysis revealed that UBE2A protein was more strongly stained in the 276 paraffin-embedded HCC tissues as compared with the 63 adjacent normal tissue. Statistical analysis also demonstrated that UBE2A expression was significantly associated with histological differentiation, TNM stage and vascular invasion of HCC (P<0.05). Notably, HCC patients with a high expression of UBE2A had a shorter survival time as compared with those with a low expression of UBE2A. There results suggested that UBE2A may be involved in the pathogenesis of HCC and may serve as an important prognostic marker. Further exploration of the involvement of UBE2A in HCC development may provide novel therapeutic targets.
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Affiliation(s)
- Jian-Dong Shen
- Department of Invasive Technology, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Shou-Zhong Fu
- Department of Invasive Technology, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Lin-Ling Ju
- Nantong Institute of Liver Diseases, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Yi-Fang Wang
- Nantong Institute of Liver Diseases, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Feng Dai
- Department of Invasive Technology, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Zhao-Xiu Liu
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226021, P.R. China
| | - Han-Zheng Ji
- Library of Nantong Third People's Hospital, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Jian-Guo Shao
- Department of Gastroenterology and Hepatology, Nantong Institute of Liver Diseases, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
| | - Zhao-Lian Bian
- Department of Gastroenterology and Hepatology, Nantong Institute of Liver Diseases, Nantong Third People's Hospital, Nantong University, Nantong, Jiangsu 226006, P.R. China
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110
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Miyamoto K, Yamashita A, Saito K. Solution structure of the PHD finger from the human KIAA1045 protein. Protein Sci 2018; 27:987-992. [PMID: 29430827 DOI: 10.1002/pro.3389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 01/23/2018] [Accepted: 02/06/2018] [Indexed: 11/08/2022]
Abstract
Cross-brace structural motifs are required as a scaffold to design artificial RING fingers (ARFs) that function as ubiquitin ligase (E3) in ubiquitination and have specific ubiquitin-conjugating enzyme (E2)-binding capabilities. The Simple Modular Architecture Research Tool database predicted the amino acid sequence 131-190 (KIAA1045ZF) of the human KIAA1045 protein as an unidentified structural region. Herein, the stoichiometry of zinc ions estimated spectrophotometrically by the metallochromic indicator revealed that the KIAA1045ZF motif binds to two zinc atoms. The structure of the KIAA1045ZF motif bound to the zinc atoms was elucidated at the atomic level by nuclear magnetic resonance. The actual structure of the KIAA1045ZF motif adopts a C4 HC3 -type PHD fold belonging to the cross-brace structural family. Therefore, the utilization of the KIAA1045ZF motif as a scaffold may lead to the creation of a novel ARF.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Ayumi Yamashita
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
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111
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Uddin MS, Stachowiak A, Mamun AA, Tzvetkov NT, Takeda S, Atanasov AG, Bergantin LB, Abdel-Daim MM, Stankiewicz AM. Autophagy and Alzheimer's Disease: From Molecular Mechanisms to Therapeutic Implications. Front Aging Neurosci 2018; 10:04. [PMID: 29441009 PMCID: PMC5797541 DOI: 10.3389/fnagi.2018.00004] [Citation(s) in RCA: 264] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 01/08/2018] [Indexed: 01/07/2023] Open
Abstract
Alzheimer’s disease (AD) is the most common cause of progressive dementia in the elderly. It is characterized by a progressive and irreversible loss of cognitive abilities and formation of senile plaques, composed mainly of amyloid β (Aβ), and neurofibrillary tangles (NFTs), composed of tau protein, in the hippocampus and cortex of afflicted humans. In brains of AD patients the metabolism of Aβ is dysregulated, which leads to the accumulation and aggregation of Aβ. Metabolism of Aβ and tau proteins is crucially influenced by autophagy. Autophagy is a lysosome-dependent, homeostatic process, in which organelles and proteins are degraded and recycled into energy. Thus, dysfunction of autophagy is suggested to lead to the accretion of noxious proteins in the AD brain. In the present review, we describe the process of autophagy and its importance in AD. Additionally, we discuss mechanisms and genes linking autophagy and AD, i.e., the mTOR pathway, neuroinflammation, endocannabinoid system, ATG7, BCL2, BECN1, CDK5, CLU, CTSD, FOXO1, GFAP, ITPR1, MAPT, PSEN1, SNCA, UBQLN1, and UCHL1. We also present pharmacological agents acting via modulation of autophagy that may show promise in AD therapy. This review updates our knowledge on autophagy mechanisms proposing novel therapeutic targets for the treatment of AD.
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Affiliation(s)
- Md Sahab Uddin
- Department of Pharmacy, Southeast University, Dhaka, Bangladesh
| | - Anna Stachowiak
- Department of Experimental Embryology, Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Magdalenka, Poland
| | | | - Nikolay T Tzvetkov
- Department of Molecular Biology and Biochemical Pharmacology, Institute of Molecular Biology "Roumen Tsanev", Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Shinya Takeda
- Department of Clinical Psychology, Tottori University Graduate School of Medical Sciences, Tottori, Japan
| | - Atanas G Atanasov
- Department of Molecular Biology, Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Magdalenka, Poland.,Department of Pharmacognosy, University of Vienna, Vienna, Austria
| | - Leandro B Bergantin
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil
| | - Mohamed M Abdel-Daim
- Department of Pharmacology, Suez Canal University, Ismailia, Egypt.,Department of Ophthalmology and Micro-technology, Yokohama City University, Yokohama, Japan
| | - Adrian M Stankiewicz
- Department of Molecular Biology, Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Magdalenka, Poland
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112
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Lim KH, Suresh B, Park JH, Kim YS, Ramakrishna S, Baek KH. Ubiquitin-specific protease 11 functions as a tumor suppressor by modulating Mgl-1 protein to regulate cancer cell growth. Oncotarget 2018; 7:14441-57. [PMID: 26919101 PMCID: PMC4924727 DOI: 10.18632/oncotarget.7581] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Accepted: 01/31/2016] [Indexed: 12/17/2022] Open
Abstract
The Lethal giant larvae (Lgl) gene encodes a cortical cytoskeleton protein, Lgl, and is involved in maintaining cell polarity and epithelial integrity. Previously, we observed that Mgl-1, a mammalian homologue of the Drosophila tumor suppressor protein Lgl, is subjected to degradation via ubiquitin-proteasome pathway, and scaffolding protein RanBPM prevents the turnover of the Mgl-1 protein. Consequently, overexpression of RanBPM enhances Mgl-1-mediated cell proliferation and migration. Here, we analyzed the ability of ubiquitin-specific protease 11 (USP11) as a novel regulator of Mgl-1 and it requires RanBPM to regulate proteasomal degradation of Mgl-1. USP11 showed deubiquitinating activity and stabilized Mgl-1 protein. However, USP11-mediated Mgl-1 stabilization was inhibited in RanBPM-knockdown cells. Furthermore, in the cancer cell migration, the regulation of Mgl-1 by USP11 required RanBPM expression. In addition, an in vivo study revealed that depletion of USP11 leads to tumor formation. Taken together, the results indicated that USP11 functions as a tumor suppressor through the regulation of Mgl-1 protein degradation via RanBPM.
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Affiliation(s)
- Key-Hwan Lim
- Department of Biomedical Science, CHA University, Gyeonggi-Do 463-400, Republic of Korea
| | - Bharathi Suresh
- Department of Biomedical Science, CHA University, Gyeonggi-Do 463-400, Republic of Korea
| | - Jung-Hyun Park
- Department of Biomedical Science, CHA University, Gyeonggi-Do 463-400, Republic of Korea
| | - Young-Soo Kim
- Department of Biomedical Science, CHA University, Gyeonggi-Do 463-400, Republic of Korea
| | - Suresh Ramakrishna
- Department of Biomedical Science, CHA University, Gyeonggi-Do 463-400, Republic of Korea
| | - Kwang-Hyun Baek
- Department of Biomedical Science, CHA University, Gyeonggi-Do 463-400, Republic of Korea
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113
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Wang DH, Song W, Wei SW, Zheng YF, Chen ZS, Han JD, Zhang HT, Luo JC, Qin YM, Xu ZH, Bai SN. Characterization of the Ubiquitin C-Terminal Hydrolase and Ubiquitin-Specific Protease Families in Rice ( Oryza sativa). FRONTIERS IN PLANT SCIENCE 2018; 9:1636. [PMID: 30498503 PMCID: PMC6249995 DOI: 10.3389/fpls.2018.01636] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 10/22/2018] [Indexed: 05/11/2023]
Abstract
The ubiquitin C-terminal hydrolase (UCH) and ubiquitin-specific processing protease (UBP) protein families both function in protein deubiquitination, playing important roles in a wide range of biological processes in animals, fungi, and plants. Little is known about the functions of these proteins in rice (Oryza sativa), and the numbers of genes reported for these families have not been consistent between different rice database resources. To further explore their functions, it is necessary to first clarify the basic molecular and biochemical nature of these two gene families. Using a database similarity search, we clarified the numbers of genes in these two families in the rice genome, examined the enzyme activities of their corresponding proteins, and characterized the expression patterns of all OsUCH and representative OsUBP genes. Five OsUCH and 44 OsUBP genes were identified in the rice genome, with four OsUCH proteins and 10 of 16 tested representative OsUBP proteins showing enzymatic activities. Two OsUCHs and five OsUBPs were found to be preferentially expressed in the early development of rice stamens. This work thus lays down a reliable bioinformatic foundation for future investigations of genes in these two families, particularly for exploring their potential roles in rice stamen development.
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Affiliation(s)
- Dong-Hui Wang
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Wei Song
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Shao-Wei Wei
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Ya-Feng Zheng
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Zhi-Shan Chen
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Jing-Dan Han
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Hong-Tao Zhang
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Jing-Chu Luo
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Yong-Mei Qin
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Zhi-Hong Xu
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
| | - Shu-Nong Bai
- State Key Laboratory of Protein and Plant Gene Research, College of Life Science, Peking University, Beijing, China
- National Center of Plant Gene Research, Beijing, China
- *Correspondence: Shu-Nong Bai,
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114
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Barrado-Gil L, Galindo I, Martínez-Alonso D, Viedma S, Alonso C. The ubiquitin-proteasome system is required for African swine fever replication. PLoS One 2017; 12:e0189741. [PMID: 29244872 PMCID: PMC5731689 DOI: 10.1371/journal.pone.0189741] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 11/30/2017] [Indexed: 01/28/2023] Open
Abstract
Several viruses manipulate the ubiquitin-proteasome system (UPS) to initiate a productive infection. Determined viral proteins are able to change the host’s ubiquitin machinery and some viruses even encode their own ubiquitinating or deubiquitinating enzymes. African swine fever virus (ASFV) encodes a gene homologous to the E2 ubiquitin conjugating (UBC) enzyme. The viral ubiquitin-conjugating enzyme (UBCv1) is expressed throughout ASFV infection and accumulates at late times post infection. UBCv is also present in the viral particle suggesting that the ubiquitin-proteasome pathway could play an important role at early ASFV infection. We determined that inhibition of the final stage of the ubiquitin-proteasome pathway blocked a post-internalization step in ASFV replication in Vero cells. Under proteasome inhibition, ASF viral genome replication, late gene expression and viral production were severely reduced. Also, ASFV enhanced proteasome activity at late times and the accumulation of polyubiquitinated proteins surrounding viral factories. Core-associated and/or viral proteins involved in DNA replication may be targets for the ubiquitin-proteasome pathway that could possibly assist virus uncoating at final core breakdown and viral DNA release. At later steps, polyubiquitinated proteins at viral factories could exert regulatory roles in cell signaling.
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Affiliation(s)
- Lucía Barrado-Gil
- Department of Biotechnology, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA, Madrid, Spain
| | - Inmaculada Galindo
- Department of Biotechnology, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA, Madrid, Spain
| | - Diego Martínez-Alonso
- Department of Biotechnology, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA, Madrid, Spain
| | - Sergio Viedma
- Department of Biotechnology, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA, Madrid, Spain
| | - Covadonga Alonso
- Department of Biotechnology, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA, Madrid, Spain
- * E-mail:
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115
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Sevoflurane Acts on Ubiquitination-Proteasome Pathway to Reduce Postsynaptic Density 95 Protein Levels in Young Mice. Anesthesiology 2017; 127:961-975. [PMID: 28968276 DOI: 10.1097/aln.0000000000001889] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Children with multiple exposures to anesthesia and surgery may have an increased risk of developing cognitive impairment. Sevoflurane, a commonly used anesthetic in children, has been reported to decrease levels of postsynaptic density 95 protein. However, the upstream mechanisms and downstream consequences of the sevoflurane-induced reduction in postsynaptic density 95 protein levels remains largely unknown. We therefore set out to assess whether sevoflurane acts on ubiquitination-proteasome pathway to facilitate postsynaptic density 95 protein degradation. METHODS Six-day-old wild-type mice received anesthesia with 3% sevoflurane 2 h daily for 3 days starting on postnatal day 6. We determined the effects of the sevoflurane anesthesia on mRNA, protein and ubiquitinated levels of postsynaptic density 95 protein in neurons, and synaptosomes and hippocampus of young mice. Cognitive function in the mice was determined at postnatal day 31 by using a Morris water maze. Proteasome inhibitor MG132 and E3 ligase mouse double mutant 2 homolog inhibitor Nutlin-3 were used for the interaction studies. RESULTS The sevoflurane anesthesia decreased protein, but not mRNA, levels of postsynaptic density 95, and reduced ubiquitinated postsynaptic density 95 protein levels in neurons, synaptosomes, and hippocampus of young mice. Both MG132 and Nutlin-3 blocked these sevoflurane-induced effects. Sevoflurane promoted the interaction of mouse double mutant 2 homolog and postsynaptic density 95 protein in neurons. Finally, MG132 and Nutlin-3 ameliorated the sevoflurane-induced cognitive impairment in the mice. CONCLUSIONS These data suggest that sevoflurane acts on the ubiquitination-proteasome pathway to facilitate postsynaptic density 95 protein degradation, which then decreases postsynaptic density 95 protein levels, leading to cognitive impairment in young mice. These studies would further promote the mechanistic investigation of anesthesia neurotoxicity in the developing brain.
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116
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VCP/p97-Mediated Unfolding as a Principle in Protein Homeostasis and Signaling. Mol Cell 2017; 69:182-194. [PMID: 29153394 DOI: 10.1016/j.molcel.2017.10.028] [Citation(s) in RCA: 267] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 10/06/2017] [Accepted: 10/20/2017] [Indexed: 01/14/2023]
Abstract
The AAA+-type ATPase p97 governs an ever-expanding number of cellular processes reaching from degradation of damaged proteins and organelles to key signaling events and chromatin regulation with thousands of client proteins. With its relevance for cellular homeostasis and genome stability, it is linked to muscular and neuronal degeneration and, conversely, constitutes an attractive anti-cancer drug target. Its molecular function is ATP-driven protein unfolding, which is directed by ubiquitin and assisted by a host of cofactor proteins. This activity underlies p97's diverse ability to pull proteins out of membranes, unfold proteins for proteasomal degradation, or segregate proteins from partners for downstream activity. Recent advances in structural analysis and biochemical reconstitution have underscored this notion, resolved detailed molecular motions within the p97 hexamer, and suggested substrate threading through the central channel of the p97 hexamer as the driving mechanism. We will discuss the mechanisms and open questions in the context of the diverse cellular activities.
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117
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Increasing the Unneddylated Cullin1 Portion Rescues the csn Phenotypes by Stabilizing Adaptor Modules To Drive SCF Assembly. Mol Cell Biol 2017; 37:MCB.00109-17. [PMID: 28923850 DOI: 10.1128/mcb.00109-17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 09/06/2017] [Indexed: 11/20/2022] Open
Abstract
The dynamic SCF (Skp1-cullin1-F-box protein) assembly is controlled by cycles of cullin neddylation/deneddylation based on the deneddylation activity of the COP9 signalosome (CSN) and global sequestration of cullins by CAND1. However, acceptance of this prediction was hampered by the results of recent studies, and the regulatory mechanism and key players remain to be identified. We found that maintaining a proper Cul1Nedd8/Cul1 ratio is crucial to ensure SCF functions. Reducing the high Cul1Nedd8/Cul1 ratios in csn mutants through ectopic expression of the nonneddylatable Cul1K722R proteins or introducing the endogenous cul1K722R point mutation significantly rescues their defective phenotypes. In vivo protein degradation assays revealed that the large portion of the unneddylated Cul1 contributes to F-box protein stabilization. Moreover, the unneddylated Cul1 tends to associate with adaptor modules, and disruption of Cul1-Skp-1 binding fails to restore the csn phenotypes. Taking the data together, we propose that unneddylated Cul1 is another central player involved in maintenance of the adaptor module pool through the formation of Cul1-Skp-1-F-box complexes and promotion of rapid SCF assembly.
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118
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Lee J, Salazar Hernández MA, Auen T, Mucka P, Lee J, Ozcan U. PGC-1α functions as a co-suppressor of XBP1s to regulate glucose metabolism. Mol Metab 2017; 7:119-131. [PMID: 29129613 PMCID: PMC5784318 DOI: 10.1016/j.molmet.2017.10.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 10/15/2017] [Accepted: 10/24/2017] [Indexed: 12/12/2022] Open
Abstract
Objective Peroxisome proliferator-activated receptor γ (PPARγ) coactivator-1α (PGC-1α) promotes hepatic gluconeogenesis by activating HNF4α and FoxO1. PGC-1α expression in the liver is highly elevated in obese and diabetic conditions, leading to increased hepatic glucose production. We previously showed that the spliced form of X-box binding protein 1 (XBP1s) suppresses FoxO1 activity and hepatic gluconeogenesis. The shared role of PGC-1α and XBP1s in regulating FoxO1 activity and gluconeogenesis led us to investigate the probable interaction between PGC-1α and XBP1s and its role in glucose metabolism. Methods We investigated the biochemical interaction between PGC-1α and XBP1s and examined the role of their interaction in glucose homeostasis using animal models. Results We show that PGC-1α interacts with XBP1s, which plays an anti-gluconeogenic role in the liver by suppressing FoxO1 activity. The physical interaction between PGC-1α and XBP1s leads to suppression of XBP1s activity rather than its activation. Upregulating PGC-1α expression in the liver of lean mice lessens XBP1s protein levels, and reducing PGC-1α levels in obese and diabetic mouse liver restores XBP1s protein induction. Conclusions Our findings reveal a novel function of PGC-1α as a suppressor of XBP1s function, suggesting that hepatic PGC-1α promotes gluconeogenesis through multiple pathways as a co-activator for HNF4α and FoxO1 and also as a suppressor for anti-gluconeogenic transcription factor XBP1s. XBP1s suppresses FoxO1 activity and hepatic gluconeogenesis. PGC-1α physically interacts with XBP1s and functions as a co-suppressor of XBP1s in the liver. The suppression of XBP1s activity by PGC-1α leads to impaired glucose homeostasis in obese mice. Hepatic PGC-1α promotes gluconeogenesis as a co-activator and also as a co-suppressor.
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Affiliation(s)
- Jaemin Lee
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Current address: Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea.
| | | | - Thomas Auen
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Patrick Mucka
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Justin Lee
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Umut Ozcan
- Division of Endocrinology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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Miyamoto K, Nakatani A, Saito K. The unique N-terminal zinc finger of synaptotagmin-like protein 4 reveals FYVE structure. Protein Sci 2017; 26:2451-2457. [PMID: 28906046 DOI: 10.1002/pro.3301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 09/10/2017] [Accepted: 09/11/2017] [Indexed: 12/11/2022]
Abstract
Synaptotagmin-like protein 4 (Slp4), expressed in human platelets, is associated with dense granule release. Slp4 is comprised of the N-terminal zinc finger, Slp homology domain, and C2 domains. We synthesized a compact construct (the Slp4N peptide) corresponding to the Slp4 N-terminal zinc finger. Herein, we have determined the solution structure of the Slp4N peptide by nuclear magnetic resonance (NMR). Furthermore, experimental, chemical modification of Cys residues revealed that the Slp4N peptide binds two zinc atoms to mediate proper folding. NMR data showed that eight Cys residues coordinate zinc atoms in a cross-brace fashion. The Simple Modular Architecture Research Tool database predicted the structure of Slp4N as a RING finger. However, the actual structure of the Slp4N peptide adopts a unique C4 C4 -type FYVE fold and is distinct from a RING fold. To create an artificial RING finger (ARF) with specific ubiquitin-conjugating enzyme (E2)-binding capability, cross-brace structures with eight zinc-ligating residues are needed as the scaffold. The cross-brace structure of the Slp4N peptide could be utilized as the scaffold for the design of ARFs.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Arisa Nakatani
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
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120
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Pergolizzi B, Bozzaro S, Bracco E. G-Protein Dependent Signal Transduction and Ubiquitination in Dictyostelium. Int J Mol Sci 2017; 18:ijms18102180. [PMID: 29048338 PMCID: PMC5666861 DOI: 10.3390/ijms18102180] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 10/12/2017] [Accepted: 10/16/2017] [Indexed: 12/20/2022] Open
Abstract
Signal transduction through G-protein-coupled receptors (GPCRs) is central for the regulation of virtually all cellular functions, and it has been widely implicated in human diseases. These receptors activate a common molecular switch that is represented by the heterotrimeric G-protein generating a number of second messengers (cAMP, cGMP, DAG, IP3, Ca2+ etc.), leading to a plethora of diverse cellular responses. Spatiotemporal regulation of signals generated by a given GPCR is crucial for proper signalling and is accomplished by a series of biochemical modifications. Over the past few years, it has become evident that many signalling proteins also undergo ubiquitination, a posttranslational modification that typically leads to protein degradation, but also mediates processes such as protein-protein interaction and protein subcellular localization. The social amoeba Dictyostelium discoideum has proven to be an excellent model to investigate signal transduction triggered by GPCR activation, as cAMP signalling via GPCR is a major regulator of chemotaxis, cell differentiation, and multicellular morphogenesis. Ubiquitin ligases have been recently involved in these processes. In the present review, we will summarize the most significant pathways activated upon GPCRs stimulation and discuss the role played by ubiquitination in Dictyostelium cells.
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Affiliation(s)
- Barbara Pergolizzi
- Department of Clinical and Biological Sciences, University of Turin, AOUS. Luigi, 10043 Orbassano TO, Italy.
| | - Salvatore Bozzaro
- Department of Clinical and Biological Sciences, University of Turin, AOUS. Luigi, 10043 Orbassano TO, Italy.
| | - Enrico Bracco
- Department of Oncology, University of Turin, AOU S. Luigi, 10043 Orbassano TO, Italy.
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121
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Wang D, Ma L, Wang B, Liu J, Wei W. E3 ubiquitin ligases in cancer and implications for therapies. Cancer Metastasis Rev 2017; 36:683-702. [DOI: 10.1007/s10555-017-9703-z] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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122
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Grasso G, Santoro AM, Lanza V, Sbardella D, Tundo GR, Ciaccio C, Marini S, Coletta M, Milardi D. The double faced role of copper in Aβ homeostasis: A survey on the interrelationship between metal dyshomeostasis, UPS functioning and autophagy in neurodegeneration. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.06.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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123
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Han Y, Sun J, Yang J, Tan Z, Luo J, Lu D. Reconstitution of the plant ubiquitination cascade in bacteria using a synthetic biology approach. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:766-776. [PMID: 28509348 DOI: 10.1111/tpj.13603] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 05/12/2017] [Indexed: 05/23/2023]
Abstract
Ubiquitination modulates nearly all aspects of plant life. Here, we reconstituted the Arabidopsis thaliana ubiquitination cascade in Escherichia coli using a synthetic biology approach. In this system, plant proteins are expressed and then immediately participate in ubiquitination reactions within E. coli cells. Additionally, the purification of individual ubiquitination components prior to setting up the ubiquitination reactions is omitted. To establish the reconstituted system, we co-expressed Arabidopsis ubiquitin (Ub) and ubiquitination substrates with E1, E2 and E3 enzymes in E. coli using the Duet expression vectors. The functionality of the system was evaluated by examining the auto-ubiquitination of a RING (really interesting new gene)-type E3 ligase AIP2 and the ubiquitination of its substrate ABI3. Our results demonstrated the fidelity and specificity of this system. In addition, we applied this system to assess a subset of Arabidopsis E2s in Ub chain formation using E2 conjugation assays. Affinity-tagged Ub allowed efficient purification of Ub conjugates in milligram quantities. Consistent with previous reports, distinct roles of various E2s in Ub chain assembly were also observed in this bacterial system. Therefore, this reconstituted system has multiple advantages, and it can be used to screen for targets of E3 ligases or to study plant ubiquitination in detail.
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Affiliation(s)
- Yufang Han
- State Key Laboratory of Plant Genomics, Center for Agricultural Research Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jianhang Sun
- State Key Laboratory of Plant Genomics, Center for Agricultural Research Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jun Yang
- State Key Laboratory of Plant Genomics, Center for Agricultural Research Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhaoyun Tan
- State Key Laboratory of Plant Genomics, Center for Agricultural Research Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China
| | - Jijing Luo
- College of Life Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, Guangxi, 530004, China
| | - Dongping Lu
- State Key Laboratory of Plant Genomics, Center for Agricultural Research Resources, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, Hebei, 050021, China
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Klahan S, Wong HSC, Tu SH, Chou WH, Zhang YF, Ho TF, Liu CY, Yih SY, Lu HF, Chen SCC, Huang CC, Chang WC. Identification of genes and pathways related to lymphovascular invasion in breast cancer patients: A bioinformatics analysis of gene expression profiles. Tumour Biol 2017. [PMID: 28651487 DOI: 10.1177/1010428317705573] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Surgery is the most effective treatment for breast cancer patients. However, some patients developed recurrence and distant metastasis after surgery. Adjuvant therapy is considered for high-risk patients depending on several prognostic markers, and lymphovascular invasion has become one of such prognostic markers that help physicians to identify the risk for distant metastasis and recurrence. However, the mechanism of lymphovascular invasion in breast cancer remains unknown. This study aims to unveil the genes and pathways that may involve in lymphovascular invasion in breast cancer. In total, 108 breast cancer samples were collected during surgery and microarray analysis was performed. Significance analysis of the microarrays and limma package for R were used to examine differentially expressed genes between lymphovascular invasion-positive and lymphovascular invasion-negative cases. Network and pathway analyses were mapped using the Ingenuity Pathway Analysis and the Database for Annotation, Visualization and Integrated Discovery. In total, 86 differentially expressed genes, including 37 downregulated genes and 49 upregulated genes were identified in lymphovascular invasion-positive patients. Among these genes, TNFSF11, IL6ST, and EPAS1 play important roles in cytokine-receptor interaction, which is the most enriched pathway related to lymphovascular invasion. Moreover, the results also suggested that an imbalance between extracellular matrix components and tumor micro-environment could induce lymphovascular invasion. Our study evaluated the underlying mechanisms of lymphovascular invasion, which may further help to assess the risk of breast cancer progression and identify potential targets of adjuvant treatment.
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Affiliation(s)
- Sukhontip Klahan
- 1 Department of Clinical Pharmacy, School of Pharmacy, Taipei Medical University
| | - Henry Sung-Ching Wong
- 1 Department of Clinical Pharmacy, School of Pharmacy, Taipei Medical University.,2 Master Program for Clinical Pharmacogenomics and Pharmacoproteomics, School of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Shih-Hsin Tu
- 3 Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,4 Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan
| | - Wan-Hsuan Chou
- 2 Master Program for Clinical Pharmacogenomics and Pharmacoproteomics, School of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Yan-Feng Zhang
- 5 HudsonAlpha Institute for Biotechnology, Huntsville, AL, USA
| | - Thien-Fiew Ho
- 6 Department of Surgery, Cathay General Hospital Sijhih, New Taipei City, Taiwan
| | - Chih-Yi Liu
- 7 Department of Pathology, Cathay General Hospital Sijhih, New Taipei City, Taiwan
| | - Shih-Ying Yih
- 8 Department of Hematology and Oncology, Cathay General Hospital Sijhih, New Taipei City, Taiwan
| | - Hsing Fang Lu
- 1 Department of Clinical Pharmacy, School of Pharmacy, Taipei Medical University
| | - Sean Chun-Chang Chen
- 9 Graduate Institute of Biomedical Informatics, College of Medical Science and Technology, Taipei Medical University
| | - Chi-Cheng Huang
- 3 Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,10 Breast Center, Cathay General Hospital, Taipei, Taiwan.,11 School of Medicine, College of Medicine, Fu-Jen Catholic University, New Taipei, Taiwan
| | - Wei-Chiao Chang
- 1 Department of Clinical Pharmacy, School of Pharmacy, Taipei Medical University.,2 Master Program for Clinical Pharmacogenomics and Pharmacoproteomics, School of Pharmacy, Taipei Medical University, Taipei, Taiwan.,12 Cancer Center, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,13 Department of Pharmacy, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,14 Center for Biomarkers and Biotech Drugs, Kaohsiung Medical University, Kaohsiung, Taiwan
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125
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Dogan T, Gnad F, Chan J, Phu L, Young A, Chen MJ, Doll S, Stokes MP, Belvin M, Friedman LS, Kirkpatrick DS, Hoeflich KP, Hatzivassiliou G. Role of the E3 ubiquitin ligase RNF157 as a novel downstream effector linking PI3K and MAPK signaling pathways to the cell cycle. J Biol Chem 2017; 292:14311-14324. [PMID: 28655764 PMCID: PMC5582827 DOI: 10.1074/jbc.m117.792754] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Indexed: 11/23/2022] Open
Abstract
The interconnected PI3K and MAPK signaling pathways are commonly perturbed in cancer. Dual inhibition of these pathways by the small-molecule PI3K inhibitor pictilisib (GDC-0941) and the MEK inhibitor cobimetinib (GDC-0973) suppresses cell proliferation and induces cell death better than either single agent in several preclinical models. Using mass spectrometry-based phosphoproteomics, we have identified the RING finger E3 ubiquitin ligase RNF157 as a target at the intersection of PI3K and MAPK signaling. We demonstrate that RNF157 phosphorylation downstream of the PI3K and MAPK pathways influences the ubiquitination and stability of RNF157 during the cell cycle in an anaphase-promoting complex/cyclosome–CDH1-dependent manner. Deletion of these phosphorylation-targeted residues on RNF157 disrupts binding to CDH1 and protects RNF157 from ubiquitination and degradation. Expression of the cyclin-dependent kinase 2 (CDK2), itself a downstream target of PI3K/MAPK signaling, leads to increased phosphorylation of RNF157 on the same residues modulated by PI3K and MAPK signaling. Inhibition of PI3K and MEK in combination or of CDK2 by their respective small-molecule inhibitors reduces RNF157 phosphorylation at these residues and attenuates RNF157 interaction with CDH1 and its subsequent degradation. Knockdown of endogenous RNF157 in melanoma cells leads to late S phase and G2/M arrest and induces apoptosis, the latter further potentiated by concurrent PI3K/MEK inhibition, consistent with a role for RNF157 in the cell cycle. We propose that RNF157 serves as a novel node integrating oncogenic signaling pathways with the cell cycle machinery and promoting optimal cell cycle progression in transformed cells.
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Affiliation(s)
- Taner Dogan
- From the Departments of Translational Oncology
| | | | | | - Lilian Phu
- Microchemistry Proteomics and Lipidomics, and
| | - Amy Young
- From the Departments of Translational Oncology
| | | | - Sophia Doll
- Microchemistry Proteomics and Lipidomics, and
| | | | - Marcia Belvin
- From the Departments of Translational Oncology.,Cancer Immunology, Genentech, Inc., South San Francisco, California 94080 and
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Epidermal growth factor promotes cyclin G2 degradation via calpain-mediated proteolysis in gynaecological cancer cells. PLoS One 2017. [PMID: 28640887 PMCID: PMC5481008 DOI: 10.1371/journal.pone.0179906] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Cyclin G2 (CCNG2) is an atypical cyclin that functions to inhibit cell cycle progression and is often dysregulated in human cancers. We have previously shown that cyclin G2 is highly unstable and can be degraded through the ubiquitin/proteasome pathway. Furthermore, cyclin G2 contains a PEST domain, which has been suggested to act as a signal for degradation by multiple proteases. In this study, we determined if calpains, a family of calcium-dependent proteases, are also involved in cyclin G2 degradation. The addition of calpain inhibitors or silencing of calpain expression by siRNAs strongly enhanced cyclin G2 levels. On the other hand, incubation of cell lysates with purified calpains or increasing the intracellular calcium concentration resulted in a decrease in cyclin G2 levels. Interestingly, the effect of calpain was found to be dependent on the phosphorylation of cyclin G2. Using a kinase inhibitor library, we found that Epidermal Growth Factor (EGF) Receptor is involved in cyclin G2 degradation and treatment with its ligand, EGF, induced cyclin G2 degradation. In addition, the presence of the PEST domain is necessary for calpain and EGF action. When the PEST domain was completely removed, calpain or EGF treatment failed to trigger degradation of cyclin G2. Taken together, these novel findings demonstrate that EGF-induced, calpain-mediated proteolysis contributes to the rapid destruction of cyclin G2 and that the PEST domain is critical for EGF/calpain actions.
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Wang H, Tang C, Jiang Z, Zhou X, Chen J, Na M, Shen H, Lin Z. Glutamine promotes Hsp70 and inhibits α-Synuclein accumulation in pheochromocytoma PC12 cells. Exp Ther Med 2017; 14:1253-1259. [PMID: 28810585 DOI: 10.3892/etm.2017.4580] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 03/10/2017] [Indexed: 12/13/2022] Open
Abstract
Hsp70 regulates α-Synuclein (α-Syn) degeneration in Parkinson's disease (PD), indicating that Hsp70 promotion may be able to prevent or reverse α-Syn-induced toxicity in PD. Additionally, it has been demonstrated that glutamine (Gln) enhances Hsp70 expression. In the present study, Gln-induced Hsp70 promotion in pheochromocytoma was investigated with reverse transcription- quantitative polymerase chain reaction and western blotting methods. Then it was observed whether heat shock factor (HSF)-1 was required for this phenomenon with an RNA interference strategy. The regulatory role of Gln on α-Syn degeneration was also determined in the α-Syn-overexpressed PC12 [PC12 (α-Syn+)] cells, which were treated with or without the proteasomal inhibitor lactacystin (Lac). The results demonstrated that treatment with ≥10 mM Gln significantly increased Hsp70 mRNA and protein levels (P<0.05) and that this promotion was HSF-1-dependent, as HSF-1 knockout with HSF-1-specific small interfering RNA abrogated Hsp70 promotion in PC12 (α-Syn+) cells. Furthermore, Gln treatment markedly upregulated α-Syn degeneration in PC12 (α-Syn+) cells, which was significantly reduced (P<0.05) in the presence of Lac. Therefore, the present study suggests that Gln is able to induce the promotion of Hsp70 expression in PC12 cells in an HSF-1-dependent manner and that Gln-mediated Hsp70 promotion may increase α-Syn degradation even in the presence of proteasomal inhibitor. Thus, glutamine may be a potential therapeutic agent to prevent α-Syn aggregation in PD.
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Affiliation(s)
- Haiyang Wang
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Chongyang Tang
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Zhenfeng Jiang
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Xiao Zhou
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Jianhang Chen
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Meng Na
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Hong Shen
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
| | - Zhiguo Lin
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
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Miyamoto K, Uechi A, Saito K. The zinc finger domain of RING finger protein 141 reveals a unique RING fold. Protein Sci 2017; 26:1681-1686. [PMID: 28547869 DOI: 10.1002/pro.3201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 05/15/2017] [Accepted: 05/15/2017] [Indexed: 11/07/2022]
Abstract
Human RING finger protein 141 (RFP141) is a germ cell-specific transcription factor during spermatogenesis. We synthesized a compact construct encoding the C-terminal zinc finger of RFP141 (RFP141C peptide). Herein we determined the solution structure of the RFP141C peptide by nuclear magnetic resonance (NMR). Moreover, NMR data and the chemical modification of cysteine residues demonstrated that the RFP141C peptide binds to two zinc atoms in a cross-brace arrangement. The Simple Modular Architecture Research Tool database predicted the structure of RFP141C as a RING finger. However, the actual structure of the RFP141C peptide adopts an atypical compact C3 HC4 -type RING fold. The position and range of the helical active site of the RFP141C structure were elucidated at the atomic level. Therefore, structural analysis may allow RFP141C to be used for designing an artificial RING finger possessing specific ubiquitin-conjugating enzyme (E2)-binding capabilities.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Airi Uechi
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
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Li YY, Zhang GY, He JP, Zhang DD, Kong XX, Yuan HM, Chen FL. Ufm1 inhibits LPS-induced endothelial cell inflammatory responses through the NF-κB signaling pathway. Int J Mol Med 2017; 39:1119-1126. [PMID: 28393202 PMCID: PMC5403479 DOI: 10.3892/ijmm.2017.2947] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 03/15/2017] [Indexed: 12/31/2022] Open
Abstract
Endothelial cell dysfunction and inflammatory responses are important early contributors to the occurrence and development of atherosclerosis (AS), which still remains to be decoded. Ubiquitin-fold modifier 1 (Ufm1) is a new member of the ubiquitin-like protein family, and its biological function remains largely unknown, particularly in endothelial cell injury and inflammatory responses. In the present study, we showed that Ufm1 was highly expressed in both the nucleus and cytoplasm of human umbilical vein endothelial cells (HUVECs). We also demonstrated that the Ufm1 expression level was increased following lipopolysaccharide (LPS)-induced inflammation in HUVECs. Moreover, overexpression of Ufm1 in HUVECs alleviated the inflammatory responses induced by LPS treatment. Additionally, we found that Ufm1 overexpression inhibited the nuclear translocation of nuclear factor-κB (NF-κB) after LPS treatment, suggesting its implication in the LPS/Toll-like receptor 4 (TLR4)/NF-κB pathway. Taken together, in addition to decoding its expression pattern in endothelial cells, we showed for the first time that Ufm1 is upregulated in LPS-induced inflammation and Ufm1 plays an inhibitory role in inflammatory responses by targeting NF-κB nuclear translocation. Thus, Ufm1 may be a novel gene that protects against inflammatory responses.
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Affiliation(s)
- Yuan-Yuan Li
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
| | - Guang-Ya Zhang
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
| | - Jiang-Ping He
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
| | - Dan-Dan Zhang
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
| | - Xiang-Xin Kong
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
| | - Hui-Min Yuan
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
| | - Feng-Ling Chen
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, P.R. China
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130
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Usp5 functions as an oncogene for stimulating tumorigenesis in hepatocellular carcinoma. Oncotarget 2017; 8:50655-50664. [PMID: 28881591 PMCID: PMC5584183 DOI: 10.18632/oncotarget.16901] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 03/28/2017] [Indexed: 12/30/2022] Open
Abstract
As deubiquitinases, several ubiquitin specific protease members have been reported to mediate tumorigenesis. Although ubiquitin specific protease 5 (Usp5) was previously demonstrated to suppress p53 transcriptional activity and DNA repair, its role in carcinogenesis remains elusive. In this study, we sought to define a novel role of Usp5 in tumorigenesis. It was found that Usp5 was significantly upregulated in hepatocellular carcinoma (HCC) cells and most clinical specimens. Further functional investigation also showed that Usp5 knockdown suppressed cell proliferation, migration, drug resistance and induced apoptosis; on the other hand, Usp5 overexpression promoted colony formation, migration, drug resistance and tumorigenesis. Additionally, the inactivated p14ARF-p53 signaling was observed in Usp5 overexpressed HCC cells, while this signaling was activated by Usp5 knockdown. Therefore, our data demonstrated that Usp5 contributed to hepatocarcinogenesis by acting as an oncogene, which provides new insights into the pathogenesis of HCC and explores a promising molecular target for HCC diagnosis and therapy.
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131
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An H, Yang L, Wang C, Gan Z, Gu H, Zhang T, Huang X, Liu Y, Li Y, Chang SJ, Lai J, Li YB, Chen S, Sun FL. Interactome Analysis Reveals a Novel Role for RAD6 in the Regulation of Proteasome Activity and Localization in Response to DNA Damage. Mol Cell Biol 2017; 37:e00419-16. [PMID: 28031328 PMCID: PMC5335506 DOI: 10.1128/mcb.00419-16] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 09/01/2016] [Accepted: 12/04/2016] [Indexed: 01/25/2023] Open
Abstract
RAD6, an E2 ubiquitin-conjugating enzyme, is a key node for determining different DNA damage repair pathways, controlling both the error-prone and the error-free DNA damage repair pathways through differential regulation of the ubiquitination of the proliferating cell nuclear antigen (PCNA) protein. However, whether other pathways are involved in the RAD6-mediated regulation of DNA damage repair is still unclear. To deeply understand the molecular mechanisms of RAD6 in DNA damage repair, we performed a proteomic analysis and identified the changes of the protein-protein interaction (PPI) networks of RAD6 before and after X-ray irradiation. Furthermore, our study indicated that a proteasome-related event is likely involved in the DNA damage repair process. Moreover, we found that RAD6 promotes proteasome activity and nuclear translocation by enhancing the degradation of PSMF1 and the lamin B receptor (LBR). Therefore, we provide a novel pathway that is employed by RAD6 in response to DNA damage.
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Affiliation(s)
- Hongli An
- Center for Translational Medicine at The First Affiliated Hospital, School of Forensic Sciences, School of Pharmacy, Xi'an Jiao Tong University Health Science Center, Xi'an, Shaanxi, People's Republic of China
| | - Lu Yang
- Center for Translational Medicine at The First Affiliated Hospital, School of Forensic Sciences, School of Pharmacy, Xi'an Jiao Tong University Health Science Center, Xi'an, Shaanxi, People's Republic of China
| | - Chen Wang
- Research Center for Translational Medicine at East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, Shanghai, People's Republic of China
| | - Zhixue Gan
- Research Center for Translational Medicine at East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, Shanghai, People's Republic of China
| | - Haihui Gu
- Department of Transfusion Medicine, Changhai Hospital, Second Military Medical University, Shanghai, Shanghai, People's Republic of China
| | - Tao Zhang
- Center for Translational Medicine at The First Affiliated Hospital, School of Forensic Sciences, School of Pharmacy, Xi'an Jiao Tong University Health Science Center, Xi'an, Shaanxi, People's Republic of China
| | - Xin Huang
- Center for Translational Medicine at The First Affiliated Hospital, School of Forensic Sciences, School of Pharmacy, Xi'an Jiao Tong University Health Science Center, Xi'an, Shaanxi, People's Republic of China
| | - Yan Liu
- People's Hospital of Zunhua, School of Life Sciences, North China University of Science and Technology, Tangshan, Hebei, People's Republic of China
| | - Yufeng Li
- People's Hospital of Zunhua, School of Life Sciences, North China University of Science and Technology, Tangshan, Hebei, People's Republic of China
| | - Shing-Jyh Chang
- Department of Obstetrics and Gynecology, Hsinchu Mackay Memorial Hospital, Hsinchu, Taiwan, Republic of China
| | - Jianghua Lai
- Center for Translational Medicine at The First Affiliated Hospital, School of Forensic Sciences, School of Pharmacy, Xi'an Jiao Tong University Health Science Center, Xi'an, Shaanxi, People's Republic of China
| | - Ya-Bin Li
- Research Center for Translational Medicine at East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, Shanghai, People's Republic of China
| | - Su Chen
- Center for Translational Medicine at The First Affiliated Hospital, School of Forensic Sciences, School of Pharmacy, Xi'an Jiao Tong University Health Science Center, Xi'an, Shaanxi, People's Republic of China
- Research Center for Translational Medicine at East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, Shanghai, People's Republic of China
- People's Hospital of Zunhua, School of Life Sciences, North China University of Science and Technology, Tangshan, Hebei, People's Republic of China
| | - Fang-Lin Sun
- Research Center for Translational Medicine at East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, Shanghai, People's Republic of China
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133
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RNF8 identified as a co-activator of estrogen receptor α promotes cell growth in breast cancer. Biochim Biophys Acta Mol Basis Dis 2017; 1863:1615-1628. [PMID: 28216286 DOI: 10.1016/j.bbadis.2017.02.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 01/20/2017] [Accepted: 02/09/2017] [Indexed: 02/07/2023]
Abstract
The ring finger protein 8 (RNF8), a key component of protein complex crucial for DNA-damage response, consists of a forkhead-associated (FHA) domain and a really interesting new gene (RING) domain that enables it to function as an E3 ubiquitin ligase. However, the biological functions of RNF8 in estrogen receptor α (ERα)-positive breast cancer and underlying mechanisms have not been fully defined. Here, we have explored RNF8 as an associated partner of ERα in breast cancer cells, and co-activates ERα-mediated transactivation. Accordingly, RNF8 depletion inhibits the expression of endogenous ERα target genes. Interestingly, our results have demonstrated that RNF8 increases ERα stability at least partially if not all via triggering ERα monoubiquitination. RNF8 functionally promotes breast cancer cell proliferation. RNF8 is highly expressed in clinical breast cancer samples and the expression of RNF8 positively correlates with that of ERα. Up-regulation of ERα-induced transactivation by RNF8 might contribute to the promotion of breast cancer progression by allowing enhancement of ERα target gene expression. Our study describes RNF8 as a co-activator of ERα increases ERα stability via post-transcriptional pathway, and provides a new insight into mechanisms for RNF8 to promote cell growth of ERα-positive breast cancer.
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134
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Liu X, Zhao B, Sun L, Bhuripanyo K, Wang Y, Bi Y, Davuluri RV, Duong DM, Nanavati D, Yin J, Kiyokawa H. Orthogonal ubiquitin transfer identifies ubiquitination substrates under differential control by the two ubiquitin activating enzymes. Nat Commun 2017; 8:14286. [PMID: 28134249 PMCID: PMC5290280 DOI: 10.1038/ncomms14286] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 12/15/2016] [Indexed: 12/27/2022] Open
Abstract
Protein ubiquitination is mediated sequentially by ubiquitin activating enzyme E1, ubiquitin conjugating enzyme E2 and ubiquitin ligase E3. Uba1 was thought to be the only E1 until the recent identification of Uba6. To differentiate the biological functions of Uba1 and Uba6, we applied an orthogonal ubiquitin transfer (OUT) technology to profile their ubiquitination targets in mammalian cells. By expressing pairs of an engineered ubiquitin and engineered Uba1 or Uba6 that were generated for exclusive interactions, we identified 697 potential Uba6 targets and 527 potential Uba1 targets with 258 overlaps. Bioinformatics analysis reveals substantial differences in pathways involving Uba1- and Uba6-specific targets. We demonstrate that polyubiquitination and proteasomal degradation of ezrin and CUGBP1 require Uba6, but not Uba1, and that Uba6 is involved in the control of ezrin localization and epithelial morphogenesis. These data suggest that distinctive substrate pools exist for Uba1 and Uba6 that reflect non-redundant biological roles for Uba6. The transfer of ubiquitin (UB) to cellular targets is mediated sequentially by three groups of enzymes, UB activating enzyme (E1), UB conjugating enzyme (E2) and UB ligase (E3). Here the authors provide evidence that the two mammalian E1 enzymes, Uba1 and Uba6, exert biologically distinct functions.
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Affiliation(s)
- Xianpeng Liu
- Department of Pharmacology, Northwestern University, Chicago, Illinois 60611, USA
| | - Bo Zhao
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA.,School of Pharmacy, Shanghai Jiao Tong University, Shanghai 20040, China
| | - Limin Sun
- Department of Pharmacology, Northwestern University, Chicago, Illinois 60611, USA
| | - Karan Bhuripanyo
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA.,Department of Chemistry, Center for Diagnostics &Therapeutics, Georgia State University, Atlanta, Georgia 30303, USA
| | - Yiyang Wang
- Department of Chemistry, Center for Diagnostics &Therapeutics, Georgia State University, Atlanta, Georgia 30303, USA
| | - Yingtao Bi
- Department of Preventive Medicine, Northwestern University, Chicago, Illinois 60611, USA
| | - Ramana V Davuluri
- Department of Preventive Medicine, Northwestern University, Chicago, Illinois 60611, USA.,Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
| | - Duc M Duong
- Integrated Proteomics Core, Emory University, Atlanta, Georgia 30322, USA
| | - Dhaval Nanavati
- Chemistry of Life Processes Institute, Northwestern University, Chicago, Illinois 60611, USA
| | - Jun Yin
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA.,Department of Chemistry, Center for Diagnostics &Therapeutics, Georgia State University, Atlanta, Georgia 30303, USA
| | - Hiroaki Kiyokawa
- Department of Pharmacology, Northwestern University, Chicago, Illinois 60611, USA.,Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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135
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Bethea CL, Reddy AP, Christian FL. How Studies of the Serotonin System in Macaque Models of Menopause Relate to Alzheimer's Disease1. J Alzheimers Dis 2017; 57:1001-1015. [PMID: 27662311 PMCID: PMC5575917 DOI: 10.3233/jad-160601] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Serotonin plays a key role in mood or affect, and dysfunction of the serotonin system has been linked to depression in humans and animal models. Depression appears prior to or coincident with overt symptoms of Alzheimer's disease (AD) in about 50% of patients, and some experts consider it a risk factor for the development of AD. In addition, AD is more prevalent in women, who also show increased incidence of depression. Indeed, it has been proposed that mechanisms underlying depression overlap the mechanisms thought to hasten AD. Women undergo ovarian failure and cessation of ovarian steroid production in middle age and the postmenopausal period correlates with an increase in the onset of depression and AD. This laboratory has examined the many actions of ovarian steroids in the serotonin system of non-human primates using a rhesus macaque model of surgical menopause with short or long-term estradiol (E) or estradiol plus progesterone (E+P) replacement therapy. In this mini-review, we present a brief synopsis of the relevant literature concerning AD, depression, and serotonin. We also present some of our data on serotonin neuron viability, the involvement of the caspase-independent pathway, and apoptosis-inducing factor in serotonin-neuron viability, as well as gene expression related to neurodegeneration and neuron viability in serotonin neurons from adult and aged surgical menopausal macaques. We show that ovarian steroids, particularly E, are crucial for serotonin neuron function and health. In the absence of E, serotonin neurons are endangered and deteriorating toward apoptosis. The possibility that this scenario may proceed or accompany AD in postmenopausal women seems likely.
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Affiliation(s)
- Cynthia L Bethea
- Division of Reproductive and Developmental Sciences, Oregon National Primate Research Center, Beaverton, OR 97229 and Department of Obstetrics and Gynecology, Oregon Health and Sciences University, Portland, OR 97239
| | - Arubala P Reddy
- Department of Internal Medicine, Texas Tech Health Science Center, Lubbock, Texas 79430
| | - Fernanda Lima Christian
- Federal University of Santa Catarina, Center of Biological Sciences, Department of Physiological Sciences, Florianópolis, SC - Brazil 88040-900
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Hantouche C, Williamson B, Valinsky WC, Solomon J, Shrier A, Young JC. Bag1 Co-chaperone Promotes TRC8 E3 Ligase-dependent Degradation of Misfolded Human Ether a Go-Go-related Gene (hERG) Potassium Channels. J Biol Chem 2016; 292:2287-2300. [PMID: 27998983 DOI: 10.1074/jbc.m116.752618] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 12/02/2016] [Indexed: 11/06/2022] Open
Abstract
Cardiac long QT syndrome type 2 is caused by mutations in the human ether a go-go-related gene (hERG) potassium channel, many of which cause misfolding and degradation at the endoplasmic reticulum instead of normal trafficking to the cell surface. The Hsc70/Hsp70 chaperones assist the folding of the hERG cytosolic domains. Here, we demonstrate that the Hsp70 nucleotide exchange factor Bag1 promotes hERG degradation by the ubiquitin-proteasome system at the endoplasmic reticulum to regulate hERG levels and channel activity. Dissociation of hERG complexes containing Hsp70 and the E3 ubiquitin ligase CHIP requires the interaction of Bag1 with Hsp70, but this does not involve the Bag1 ubiquitin-like domain. The interaction with Bag1 then shifts hERG degradation to the membrane-anchored E3 ligase TRC8 and its E2-conjugating enzyme Ube2g2, as determined by siRNA screening. TRC8 interacts through the transmembrane region with hERG and decreases hERG functional expression. TRC8 also mediates degradation of the misfolded hERG-G601S disease mutant, but pharmacological stabilization of the mutant structure prevents degradation. Our results identify TRC8 as a previously unknown Hsp70-independent quality control E3 ligase for hERG.
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Affiliation(s)
- Christine Hantouche
- From the Departments of Physiology and.,Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - Brittany Williamson
- Biochemistry and.,Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - William C Valinsky
- From the Departments of Physiology and.,Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - Joshua Solomon
- From the Departments of Physiology and.,Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - Alvin Shrier
- From the Departments of Physiology and .,Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - Jason C Young
- Biochemistry and .,Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, Quebec H3G 0B1, Canada
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137
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Loss of the histone methyltransferase EZH2 induces resistance to multiple drugs in acute myeloid leukemia. Nat Med 2016; 23:69-78. [PMID: 27941792 DOI: 10.1038/nm.4247] [Citation(s) in RCA: 172] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 10/27/2016] [Indexed: 12/13/2022]
Abstract
In acute myeloid leukemia (AML), therapy resistance frequently occurs, leading to high mortality among patients. However, the mechanisms that render leukemic cells drug resistant remain largely undefined. Here, we identified loss of the histone methyltransferase EZH2 and subsequent reduction of histone H3K27 trimethylation as a novel pathway of acquired resistance to tyrosine kinase inhibitors (TKIs) and cytotoxic drugs in AML. Low EZH2 protein levels correlated with poor prognosis in AML patients. Suppression of EZH2 protein expression induced chemoresistance of AML cell lines and primary cells in vitro and in vivo. Low EZH2 levels resulted in derepression of HOX genes, and knockdown of HOXB7 and HOXA9 in the resistant cells was sufficient to improve sensitivity to TKIs and cytotoxic drugs. The endogenous loss of EZH2 expression in resistant cells and primary blasts from a subset of relapsed AML patients resulted from enhanced CDK1-dependent phosphorylation of EZH2 at Thr487. This interaction was stabilized by heat shock protein 90 (HSP90) and followed by proteasomal degradation of EZH2 in drug-resistant cells. Accordingly, inhibitors of HSP90, CDK1 and the proteasome prevented EZH2 degradation, decreased HOX gene expression and restored drug sensitivity. Finally, patients with reduced EZH2 levels at progression to standard therapy responded to the combination of bortezomib and cytarabine, concomitant with the re-establishment of EZH2 expression and blast clearance. These data suggest restoration of EZH2 protein as a viable approach to overcome treatment resistance in this AML patient population.
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138
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Bastos PAD, da Costa JP, Vitorino R. A glimpse into the modulation of post-translational modifications of human-colonizing bacteria. J Proteomics 2016; 152:254-275. [PMID: 27888141 DOI: 10.1016/j.jprot.2016.11.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 10/22/2016] [Accepted: 11/07/2016] [Indexed: 12/19/2022]
Abstract
Protein post-translational modifications (PTMs) are a key bacterial feature that holds the capability to modulate protein function and responses to environmental cues. Until recently, their role in the regulation of prokaryotic systems has been largely neglected. However, the latest developments in mass spectrometry-based proteomics have allowed an unparalleled identification and quantification of proteins and peptides that undergo PTMs in bacteria, including in species which directly or indirectly affect human health. Herein, we address this issue by carrying out the largest and most comprehensive global pooling and comparison of PTM peptides and proteins from bacterial species performed to date. Data was collected from 91 studies relating to PTM bacterial peptides or proteins identified by mass spectrometry-based methods. The present analysis revealed that there was a considerable overlap between PTMs across species, especially between acetylation and other PTMs, particularly succinylation. Phylogenetically closer species may present more overlapping phosphoproteomes, but environmental triggers also contribute to this proximity. PTMs among bacteria were found to be extremely versatile and diverse, meaning that the same protein may undergo a wide variety of different modifications across several species, but it could also suffer different modifications within the same species.
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Affiliation(s)
- Paulo André Dias Bastos
- Department of Medical Sciences, Institute for Biomedicine-iBiMED, University of Aveiro, Aveiro, Portugal; Department of Chemistry, University of Aveiro, Portugal
| | | | - Rui Vitorino
- Department of Medical Sciences, Institute for Biomedicine-iBiMED, University of Aveiro, Aveiro, Portugal; Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal.
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139
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Peng B, Ganapathy S, Shen L, Huang J, Yi B, Zhou X, Dai W, Chen C. Targeting Bcl-2 stability to sensitize cells harboring oncogenic ras. Oncotarget 2016; 6:22328-37. [PMID: 26041886 PMCID: PMC4673166 DOI: 10.18632/oncotarget.4084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 05/13/2015] [Indexed: 11/29/2022] Open
Abstract
The pro-survival factor Bcl-2 and its family members are critical determinants of the threshold of the susceptibility of cells to apoptosis. Studies are shown that cells harboring an oncogenic ras were extremely sensitive to the inhibition of protein kinase C (PKC) and Bcl-2 could antagonize this apoptotic process. However, it remains unrevealed how Bcl-2 is being regulated in this apoptotic process. In this study, we investigate the role of Bcl-2 stability in sensitizing the cells harboring oncogenic K-ras to apoptosis triggered by PKC inhibitor GO6976. We demonstrated that Bcl-2 in Swiss3T3 cells ectopically expressing or murine lung cancer LKR cells harboring K-ras rapidly underwent ubiquitin-dependent proteasome pathway after the treatment of GO6976, accompanied with induction of apoptosis. In this process, Bcl-2 formed the complex with Keap-1 and Cul3. The mutation of serine-17 and deletion of BH-2 or 4 was required for Bcl-2 ubiquitination and degradation, which elevate the signal threshold for the induction of apoptosis in the cells following PKC inhibition. Thus, Bcl-2 appears an attractive target for the induction of apoptosis by PKC inhibition in cancer cells expressing oncogenic K-ras.
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Affiliation(s)
- Bo Peng
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| | | | - Ling Shen
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| | - Junchi Huang
- Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg, Sweden
| | - Bo Yi
- Center for Drug Discovery, Northeastern University, Boston, MA, USA.,The Jiangxi Province Tumor Hospital, Nanchang, China
| | - Xiaodong Zhou
- Center for Drug Discovery, Northeastern University, Boston, MA, USA.,The First Affiliated Hospital of Nanchang University, Nanchang University School of Medicine, Nanchang, China
| | - Wei Dai
- Department of Environmental Medicine, New York University, Tuxedo, NY, USA
| | - Changyan Chen
- Center for Drug Discovery, Northeastern University, Boston, MA, USA.,Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg, Sweden.,The First Affiliated Hospital of Nanchang University, Nanchang University School of Medicine, Nanchang, China
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140
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Qin GM, Hou YB, Zhao XM. A systematic exploration of the associations between amino acid variants and post-translational modifications. Neurocomputing 2016. [DOI: 10.1016/j.neucom.2015.11.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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141
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Notsu K, Nakagawa M, Nakamura M. Ubiquitin-like protein MNSFβ noncovalently binds to molecular chaperone HSPA8 and regulates osteoclastogenesis. Mol Cell Biochem 2016; 421:149-56. [PMID: 27581120 DOI: 10.1007/s11010-016-2795-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Accepted: 08/06/2016] [Indexed: 02/06/2023]
Abstract
MNSFβ, a ubiquitin-like protein, covalently binds to various target proteins including proapoptotic Bcl-G. During the course of isolation of MNSFβ-conjugating enzyme(s), we identified a novel target protein for MNSFβ. MALDI-TOF MS fingerprinting revealed that the MNSFβ-interacting protein is HSPA8 (heat shock 70-kDa protein 8). We observed that MNSFβ noncovalently binds to HSPA8 in the presence of ATP in vitro. Double knockdown of MNSFβ and HSPA8 strongly inhibited RANKL-induced osteoclastogenesis from Raw264.7 macrophage-like cells. The same treatment inhibited RANKL-induced ERK1/2 and p38 phosphorylation and TNFα production, suggesting that the association of MNSFβ with HSPA8 may promote RANKL-induced osteoclastogenesis. This is the first report that MNSFβ binds to a protein substrate via the noncovalent association and exerts biological effects.
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Affiliation(s)
- Kaori Notsu
- The Department of Cooperative Medical Research, Collaboration Center, Shimane University, Izumo, 693-8501, Japan
| | - Mai Nakagawa
- The Department of Cooperative Medical Research, Collaboration Center, Shimane University, Izumo, 693-8501, Japan
| | - Morihiko Nakamura
- The Department of Cooperative Medical Research, Collaboration Center, Shimane University, Izumo, 693-8501, Japan.
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142
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Wang Q, Zhou Q, Zhang S, Shao W, Yin Y, Li Y, Hou J, Zhang X, Guo Y, Wang X, Gu X, Zhou J. Elevated Hapln2 Expression Contributes to Protein Aggregation and Neurodegeneration in an Animal Model of Parkinson's Disease. Front Aging Neurosci 2016; 8:197. [PMID: 27601993 PMCID: PMC4993759 DOI: 10.3389/fnagi.2016.00197] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 08/02/2016] [Indexed: 01/15/2023] Open
Abstract
Parkinson's disease (PD), the second most common age-associated progressive neurodegenerative disorder, is characterized by the loss of dopaminergic (DA) neurons in the substantia nigra pars compacta (SN). The pathogenesis of PD and the mechanisms underlying the degeneration of DA neurons are still not fully understood. Our previous quantitative proteomics study revealed that hyaluronan and proteoglycan binding link protein 2 (Hapln2) is one of differentially expressed proteins in the substantia nigra tissues from PD patients and healthy control subjects. However, the potential role of Hapln2 in PD pathogenesis remains elusive. In the present study, we characterized the expression pattern of Hapln2. In situ hybridization revealed that Hapln2 mRNA was widely expressed in adult rat brain with high abundance in the substantia nigra. Immunoblotting showed that expression levels of Hapln2 were markedly upregulated in the substantia nigra of either human subjects with Parkinson's disease compared with healthy control. Likewise, there were profound increases in Hapln2 expression in neurotoxin 6-hydroxydopamine-treated rat. Overexpression of Hapln2 in vitro increased vulnerability of MES23.5 cells, a dopaminergic cell line, to 6-hydroxydopamine. Moreover, Hapln2 overexpression led to the formation of cytoplasmic aggregates which were co-localized with ubiquitin and E3 ligases including Parkin, Gp78, and Hrd1 in vitro. Endogenous α-synuclein was also localized in Hapln2-containing aggregates and ablation of Hapln2 led to a marked decrease of α-synuclein in insoluble fraction compared with control. Thus, Hapln2 is identified as a novel factor contributing to neurodegeneration in PD. Our data provides new insights into the cellular mechanism underlying the pathogenesis in PD.
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Affiliation(s)
- Qinqin Wang
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of SciencesShanghai, China; University of Chinese Academy of SciencesShanghai, China
| | - Qinbo Zhou
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
| | - Shuzhen Zhang
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
| | - Wei Shao
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
| | - Yanqing Yin
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
| | - Yandong Li
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
| | - Jincan Hou
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
| | - Xinhua Zhang
- Co-innovation Center of Neuroregeneration, School of Medicine, Nantong University Nantong, China
| | - Yongshun Guo
- Center of Parkinson's Disease, Beijing Institute for Brain Disorders Beijing, China
| | - Xiaomin Wang
- Center of Parkinson's Disease, Beijing Institute for Brain Disorders Beijing, China
| | - Xiaosong Gu
- Co-innovation Center of Neuroregeneration, School of Medicine, Nantong University Nantong, China
| | - Jiawei Zhou
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences Shanghai, China
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143
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Louros SR, Osterweil EK. Perturbed proteostasis in autism spectrum disorders. J Neurochem 2016; 139:1081-1092. [PMID: 27365114 PMCID: PMC5215415 DOI: 10.1111/jnc.13723] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 06/10/2016] [Accepted: 06/24/2016] [Indexed: 12/30/2022]
Abstract
Dynamic changes in synaptic strength rely on de novo protein synthesis and protein degradation by the ubiquitin proteasome system (UPS). Disruption of either of these cellular processes will result in significant impairments in synaptic plasticity and memory formation. Mutations in several genes encoding regulators of mRNA translation and members of the UPS have been associated with an increased risk for the development of autism spectrum disorders. It is possible that these mutations result in a similar imbalance in protein homeostasis (proteostasis) at the synapse. This review will summarize recent work investigating the role of the UPS in synaptic plasticity at glutamatergic synapses, and propose that dysfunctional proteostasis is a common consequence of several genetic mutations linked to autism spectrum disorders.
Dynamic changes in synaptic strength rely on de novo protein synthesis and protein degradation by the ubiquitin proteasome system (UPS). Disruption of either of these cellular processes will result in significant impairments in synaptic plasticity and memory formation. Mutations in several genes encoding regulators of mRNA translation (i.e. FMR1) and protein degradation (i.e. UBE3A) have been associated with an increased risk for autism spectrum disorders and intellectual disability (ASD/ID). These mutations similarly disrupt protein homeostasis (proteostasis). Compensatory changes that reset the rate of proteostasis may contribute to the neurological symptoms of ASD/ID. This review summarizes recent work investigating the role of the UPS in synaptic plasticity at glutamatergic synapses, and proposes that dysfunctional proteostasis is a common consequence of several genetic mutations linked to ASD.
This article is part of a mini review series: “Synaptic Function and Dysfunction in Brain Diseases”.
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Affiliation(s)
- Susana R Louros
- Centre for Integrative Physiology/Patrick Wild Centre, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, EH8 9XD, UK
| | - Emily K Osterweil
- Centre for Integrative Physiology/Patrick Wild Centre, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, EH8 9XD, UK
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144
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Post-translational regulation of RORγt—A therapeutic target for the modulation of interleukin-17-mediated responses in autoimmune diseases. Cytokine Growth Factor Rev 2016; 30:1-17. [DOI: 10.1016/j.cytogfr.2016.07.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 07/22/2016] [Indexed: 01/16/2023]
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145
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Session 7: Ubiquitin & Proteasomes. Toxicol Pathol 2016. [DOI: 10.1080/01926230490882475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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146
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Liu S, de Boeck M, van Dam H, ten Dijke P. Regulation of the TGF-β pathway by deubiquitinases in cancer. Int J Biochem Cell Biol 2016; 76:135-45. [DOI: 10.1016/j.biocel.2016.05.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 05/02/2016] [Accepted: 05/03/2016] [Indexed: 11/26/2022]
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147
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Guo Y, Zhao M, Lu Q. Transcription factor RFX1 is ubiquitinated by E3 ligase STUB1 in systemic lupus erythematosus. Clin Immunol 2016; 169:1-7. [PMID: 27283392 DOI: 10.1016/j.clim.2016.06.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 05/08/2016] [Accepted: 06/03/2016] [Indexed: 10/21/2022]
Abstract
Systemic lupus erythematosus (SLE) is a chronic autoimmune disease caused by complex interactions between genes and the environment. The expression level of transcription factor regulatory factor X 1 (RFX1) is reduced in T cells from SLE patients. RFX1 can regulate epigenetic modifications of CD70 and CD11a and plays an important role in the development of SLE. However, the mechanisms that mediate reduction of RFX1 in SLE are unclear. Here, we demonstrate that RFX1 protein expression can be tightly regulated by polyubiquitination-mediated proteosomal degradation via STIP1 homology and U-box containing protein 1 (STUB1). The E3 ligase STUB1 is upregulated in CD4(+)T cells of SLE patients compared to healthy subjects. Overexpression of STUB1 in CD4(+)T cells leads to upregulation of levels of CD70 and CD11a in T cells. The modulation of STUB1 activity may provide a novel therapeutic approach for SLE.
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Affiliation(s)
- Yu Guo
- Department of Dermatology and Epigenetic Research Center, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Ming Zhao
- Department of Dermatology and Epigenetic Research Center, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
| | - Qianjin Lu
- Department of Dermatology and Epigenetic Research Center, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China.
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148
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von Delbrück M, Kniss A, Rogov VV, Pluska L, Bagola K, Löhr F, Güntert P, Sommer T, Dötsch V. The CUE Domain of Cue1 Aligns Growing Ubiquitin Chains with Ubc7 for Rapid Elongation. Mol Cell 2016; 62:918-928. [PMID: 27264873 DOI: 10.1016/j.molcel.2016.04.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 03/21/2016] [Accepted: 04/25/2016] [Indexed: 10/21/2022]
Abstract
Ubiquitin conjugation is an essential process modulating protein function in eukaryotic cells. Surprisingly, little is known about how the progressive assembly of ubiquitin chains is managed by the responsible enzymes. Only recently has ubiquitin binding activity emerged as an important factor in chain formation. The Ubc7 activator Cue1 carries a ubiquitin binding CUE domain that substantially stimulates K48-linked polyubiquitination mediated by Ubc7. Our results from NMR-based analysis and in vitro ubiquitination reactions point out that two parameters accelerate ubiquitin chain assembly: the increasing number of CUE binding sites and the position of CUE binding within a growing chain. In particular, interactions with a ubiquitin moiety adjacent to the acceptor ubiquitin facilitate chain elongation. These data indicate a mechanism for ubiquitin binding in which Cue1 positions Ubc7 and the distal acceptor ubiquitin for rapid polyubiquitination. Disrupting this mechanism results in dysfunction of the ERAD pathway by a delayed turnover of substrates.
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Affiliation(s)
- Maximilian von Delbrück
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Strasse 10, 13125 Berlin-Buch, Germany
| | - Andreas Kniss
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Max-von-Laue Strasse 9, 60439 Frankfurt am Main, Germany
| | - Vladimir V Rogov
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Max-von-Laue Strasse 9, 60439 Frankfurt am Main, Germany
| | - Lukas Pluska
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Strasse 10, 13125 Berlin-Buch, Germany
| | - Katrin Bagola
- Ludwig Institute for Cancer Research, University of Oxford, Old Road Campus Research Building, Oxford OX3 7DQ, UK
| | - Frank Löhr
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Max-von-Laue Strasse 9, 60439 Frankfurt am Main, Germany
| | - Peter Güntert
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Max-von-Laue Strasse 9, 60439 Frankfurt am Main, Germany
| | - Thomas Sommer
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Robert-Rössle-Strasse 10, 13125 Berlin-Buch, Germany; Institute for Biology, Humboldt Universität zu Berlin, Invalidenstrasse 43, 10115 Berlin, Germany.
| | - Volker Dötsch
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Max-von-Laue Strasse 9, 60439 Frankfurt am Main, Germany.
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149
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Li W, Yao A, Zhi H, Kaur K, Zhu YC, Jia M, Zhao H, Wang Q, Jin S, Zhao G, Xiong ZQ, Zhang YQ. Angelman Syndrome Protein Ube3a Regulates Synaptic Growth and Endocytosis by Inhibiting BMP Signaling in Drosophila. PLoS Genet 2016; 12:e1006062. [PMID: 27232889 PMCID: PMC4883773 DOI: 10.1371/journal.pgen.1006062] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 04/27/2016] [Indexed: 11/19/2022] Open
Abstract
Altered expression of the E3 ubiquitin ligase UBE3A, which is involved in protein degradation through the proteasome-mediated pathway, is associated with neurodevelopmental and behavioral defects observed in Angelman syndrome (AS) and autism. However, little is known about the neuronal function of UBE3A and the pathogenesis of UBE3A-associated disorders. To understand the in vivo function of UBE3A in the nervous system, we generated multiple mutations of ube3a, the Drosophila ortholog of UBE3A. We found a significantly increased number of total boutons and satellite boutons in conjunction with compromised endocytosis in the neuromuscular junctions (NMJs) of ube3a mutants compared to the wild type. Genetic and biochemical analysis showed upregulation of bone morphogenetic protein (BMP) signaling in the nervous system of ube3a mutants. An immunochemical study revealed a specific increase in the protein level of Thickveins (Tkv), a type I BMP receptor, but not other BMP receptors Wishful thinking (Wit) and Saxophone (Sax), in ube3a mutants. Ube3a was associated with and specifically ubiquitinated lysine 227 within the cytoplasmic tail of Tkv, and promoted its proteasomal degradation in Schneider 2 cells. Negative regulation of Tkv by Ube3a was conserved in mammalian cells. These results reveal a critical role for Ube3a in regulating NMJ synapse development by repressing BMP signaling. This study sheds new light onto the neuronal functions of UBE3A and provides novel perspectives for understanding the pathogenesis of UBE3A-associated disorders.
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Affiliation(s)
- Wenhua Li
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Aiyu Yao
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
- * E-mail: (AY); (YQZ)
| | - Hui Zhi
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Kuldeep Kaur
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Yong-chuan Zhu
- Institute of Neuroscience and State Key Laboratory of Neuroscience, Shanghai Institute of Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Mingyue Jia
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Hui Zhao
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Qifu Wang
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Shan Jin
- College of Life Science, Hubei University, Wuhan, Hubei, China
| | - Guoli Zhao
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Zhi-Qi Xiong
- Institute of Neuroscience and State Key Laboratory of Neuroscience, Shanghai Institute of Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yong Q. Zhang
- Key Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
- * E-mail: (AY); (YQZ)
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150
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Tian P, Best RB. Structural Determinants of Misfolding in Multidomain Proteins. PLoS Comput Biol 2016; 12:e1004933. [PMID: 27163669 PMCID: PMC4862688 DOI: 10.1371/journal.pcbi.1004933] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 04/21/2016] [Indexed: 12/02/2022] Open
Abstract
Recent single molecule experiments, using either atomic force microscopy (AFM) or Förster resonance energy transfer (FRET) have shown that multidomain proteins containing tandem repeats may form stable misfolded structures. Topology-based simulation models have been used successfully to generate models for these structures with domain-swapped features, fully consistent with the available data. However, it is also known that some multidomain protein folds exhibit no evidence for misfolding, even when adjacent domains have identical sequences. Here we pose the question: what factors influence the propensity of a given fold to undergo domain-swapped misfolding? Using a coarse-grained simulation model, we can reproduce the known propensities of multidomain proteins to form domain-swapped misfolds, where data is available. Contrary to what might be naively expected based on the previously described misfolding mechanism, we find that the extent of misfolding is not determined by the relative folding rates or barrier heights for forming the domains present in the initial intermediates leading to folded or misfolded structures. Instead, it appears that the propensity is more closely related to the relative stability of the domains present in folded and misfolded intermediates. We show that these findings can be rationalized if the folded and misfolded domains are part of the same folding funnel, with commitment to one structure or the other occurring only at a relatively late stage of folding. Nonetheless, the results are still fully consistent with the kinetic models previously proposed to explain misfolding, with a specific interpretation of the observed rate coefficients. Finally, we investigate the relation between interdomain linker length and misfolding, and propose a simple alchemical model to predict the propensity for domain-swapped misfolding of multidomain proteins.
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Affiliation(s)
- Pengfei Tian
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Robert B. Best
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
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