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Pavlovic T, Margarit E, Müller GL, Saenz E, Ruzzo AI, Drincovich MF, Borrás L, Saigo M, Wheeler MCG. Differential metabolic reprogramming in developing soybean embryos in response to nutritional conditions and abscisic acid. PLANT MOLECULAR BIOLOGY 2023; 113:89-103. [PMID: 37702897 DOI: 10.1007/s11103-023-01377-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 08/29/2023] [Indexed: 09/14/2023]
Abstract
Seed storage compound deposition is influenced by both maternal and filial tissues. Within this framework, we analyzed strategies that operate during the development and filling of soybean embryos, using in vitro culture systems combined with metabolomics and proteomics approaches. The carbon:nitrogen ratio (C:N) of the maternal supply and the hormone abscisic acid (ABA) are specific and interacting signals inducing differential metabolic reprogrammings linked to changes in the accumulation of storage macromolecules like proteins or oils. Differences in the abundance of sugars, amino acids, enzymes, transporters, transcription factors, and proteins involved in signaling were detected. Embryos adapted to the nutritional status by enhancing the metabolism of both carbon and nitrogen under lower C:N ratio condition or only carbon under higher C:N ratio condition. ABA turned off multiple pathways especially in high availability of amino acids, prioritizing the storage compounds biosynthesis. Common responses induced by ABA involved increased sucrose uptake (to increase the sink force) and oleosin (oil body structural component) accumulation. In turn, ABA differentially promoted protein degradation under lower nitrogen supply in order to sustain the metabolic demands. Further, the operation of a citrate shuttle was suggested by transcript quantification and enzymatic activity measurements. The results obtained are useful to help define biotechnological tools and technological approaches to improve oil and protein yields, with direct impact on human and animal nutrition as well as in green chemistry.
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Affiliation(s)
- Tatiana Pavlovic
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina
| | - Ezequiel Margarit
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina
| | - Gabriela Leticia Müller
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina
| | - Ezequiel Saenz
- Instituto de Investigaciones en Ciencias Agrarias de Rosario (IICAR-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, Campo Experimental Villarino CC14, S2125ZAA, Zavalla, Santa Fe, Argentina
| | - Andrés Iván Ruzzo
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina
| | - María Fabiana Drincovich
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina
| | - Lucas Borrás
- Instituto de Investigaciones en Ciencias Agrarias de Rosario (IICAR-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, Campo Experimental Villarino CC14, S2125ZAA, Zavalla, Santa Fe, Argentina
| | - Mariana Saigo
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina.
| | - Mariel Claudia Gerrard Wheeler
- Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, S2000LRJ, Rosario, Santa Fe, Argentina.
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2
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Sun A, Tian X, Yang W, Lin Q. Overexpression of SCYL1 Is Associated with Progression of Breast Cancer. Curr Oncol 2022; 29:6922-6932. [PMID: 36290821 PMCID: PMC9600755 DOI: 10.3390/curroncol29100544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/15/2022] [Accepted: 09/21/2022] [Indexed: 01/13/2023] Open
Abstract
SCYL1 is a pseudokinase and plays roles in cell division and gene transcription, nuclear/cytoplasmic shuttling of tRNA, protein glycosylation, and Golgi morphology. However, the role of SCYL1 in human breast cancer progression remains largely unknown. In this study, we determined expression of SCYL1 in breast cancer by searching the Cancer Genome Atlas (TCGA) and Tumor Immunoassay Resource (TIMER) databases. Meanwhile, we collected breast tumor tissue samples from 247 cases and detected expression of SCYL1 in the tumors using the tissue microarray assay (TMA). Association of SCYL1 with prognosis of breast cancer was determined based on the PrognoScan database. The results have shown that SCYL1 is overexpressed in breast cancer, and the expression of SCYL1 is associated with poor clinical outcomes of breast cancer patients. Furthermore, knockdown of SCYL1 by shRNAs significantly inhibited the proliferation and migration of breast cancer cells. Taken together, our data suggest that SCYL1 is a biomarker for poor prognosis of breast cancer, has a promoting role in breast cancer progression, and is a potential target for breast cancer therapy.
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Xiong X, Lai X, Li A, Liu Z, Ma N. Diversity roles of CHD1L in normal cell function and tumorigenesis. Biomark Res 2021; 9:16. [PMID: 33663617 PMCID: PMC7934534 DOI: 10.1186/s40364-021-00269-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 02/16/2021] [Indexed: 12/14/2022] Open
Abstract
Chromodomain helicase/ATPase DNA binding protein 1-like gene (CHD1L) is a multifunctional protein participated in diverse cellular processes, including chromosome remodeling, cell differentiation and development. CHD1L is a regulator of chromosomal integrity maintenance, DNA repair and transcriptional regulation through its bindings to DNA. By regulating kinds of complex networks, CHD1L has been identified as a potent anti-apoptotic and pro-proliferative factor. CHD1L is also an oncoprotein since its overexpression leads to dysregulation of related downstream targets in various cancers. The latest advances in the functional molecular basis of CHD1L in normal cells will be described in this review. As the same time, we will describe the current understanding of CHD1L in terms of structure, characteristics, function and the molecular mechanisms underlying CHD1L in tumorigenesis. We inference that the role of CHD1L which involve in multiple cellular processes and oncogenesis is well worth further studying in basic biology and clinical relevance.
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Affiliation(s)
- Xifeng Xiong
- Guangzhou Institute of Traumatic Surgery, Guangzhou Red Cross Hospital, Jinan University, Guangzhou, 510220, China
| | - Xudong Lai
- Departement of infectious disease, Guangzhou Red Cross Hospital, Jinan University, Guangzhou, 510220, China
| | - Aiguo Li
- Guangzhou Institute of Traumatic Surgery, Guangzhou Red Cross Hospital, Jinan University, Guangzhou, 510220, China.
| | - Zhihe Liu
- Guangzhou Institute of Traumatic Surgery, Guangzhou Red Cross Hospital, Jinan University, Guangzhou, 510220, China.
| | - Ningfang Ma
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou, 510095, China. .,Department of Histology and Embryology, Guangzhou Medical University, Xinzao Town, Panyu District, Guangzhou, 511436, China.
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4
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Riether C, Radpour R, Kallen NM, Bürgin DT, Bachmann C, Schürch CM, Lüthi U, Arambasic M, Hoppe S, Albers CE, Baerlocher GM, Ochsenbein AF. Metoclopramide treatment blocks CD93-signaling-mediated self-renewal of chronic myeloid leukemia stem cells. Cell Rep 2021; 34:108663. [PMID: 33503440 DOI: 10.1016/j.celrep.2020.108663] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 11/20/2020] [Accepted: 12/28/2020] [Indexed: 12/17/2022] Open
Abstract
Self-renewal is a key characteristic of leukemia stem cells (LSCs) responsible for the development and maintenance of leukemia. In this study, we identify CD93 as an important regulator of self-renewal and proliferation of murine and human LSCs, but not hematopoietic stem cells (HSCs). The intracellular domain of CD93 promotes gene transcription via the transcriptional regulator SCY1-like pseudokinase 1 independently of ligation of the extracellular domain. In a drug library screen, we identify the anti-emetic agent metoclopramide as an efficient blocker of CD93 signaling. Metoclopramide treatment reduces murine and human LSCs in vitro and prolongs survival of chronic myeloid leukemia (CML) mice through downregulation of pathways related to stemness and proliferation in LSCs. Overall, these results identify CD93 signaling as an LSC-specific regulator of self-renewal and proliferation and a targetable pathway to eliminate LSCs in CML.
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Affiliation(s)
- Carsten Riether
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.
| | - Ramin Radpour
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Nils M Kallen
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Damian T Bürgin
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Chantal Bachmann
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland; Graduate School of Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Christian M Schürch
- Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
| | - Ursina Lüthi
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Miroslav Arambasic
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Sven Hoppe
- Wirbelsäulenmedizin Bern, Hirslanden Salem-Spital, Bern, Switzerland; Department of Orthopedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Christoph E Albers
- Department of Orthopedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Gabriela M Baerlocher
- Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland; Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Adrian F Ochsenbein
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.
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5
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Li JQ, Gong JY, Knisely AS, Zhang MH, Wang JS. Recurrent acute liver failure associated with novel SCYL1 mutation: A case report. World J Clin Cases 2019; 7:494-499. [PMID: 30842961 PMCID: PMC6397814 DOI: 10.12998/wjcc.v7.i4.494] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 01/16/2019] [Accepted: 01/30/2019] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Pediatric recurrent acute liver failure (RALF) with recovery between episodes is rare. Causes include autoimmune disease, which may flare and subside; intermittent exposure to toxins, as with ingestions; and metabolic disorders, among them the fever-associated crises ascribed to biallelic mutations in SCYL1, with RALF beginning in infancy. SCYL1 disease manifest with RALF, as known to date, includes central and peripheral neurologic and muscular morbidity (hepatocerebellar neuropathy syndrome). Primary ventilatory and skeletal diseases also have been noted in some reports.
CASE SUMMARY We describe a Han Chinese boy in whom fever-associated RALF began at age 14 mo. Bilateral femoral head abnormalities and mild impairment of neurologic function were first noted aged 8 years 6 mo. Liver biopsy after the third RALF episode (7 years) and during resolution of the fourth RALF episode (8 years 6 mo) found abnormal architecture and hepatic fibrosis, respectively. Whole-exome sequencing revealed homozygosity for the novel frameshift mutation c.92_93insGGGCCCT, p.(H32Gfs*20) in SCYL1 (parental heterozygosity confirmed).
CONCLUSION Our findings expand the mutational and clinical spectrum of SCYL1 disease. In our patient a substantial neurologic component was lacking and skeletal disease was identified relatively late.
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Affiliation(s)
- Jia-Qi Li
- Department of Pediatrics, Jinshan Hospital of Fudan University, Shanghai 201508, China
| | - Jing-Yu Gong
- Department of Pediatrics, Jinshan Hospital of Fudan University, Shanghai 201508, China
| | - A S Knisely
- Institut für Pathologie, Medizinische Universität Graz, Neue Stiftingtalstraße 6, Graz 8010, Austria
| | - Mei-Hong Zhang
- Department of Pediatrics, Jinshan Hospital of Fudan University, Shanghai 201508, China
| | - Jian-She Wang
- The Center for Pediatric Liver Diseases, Children’s Hospital of Fudan University, Shanghai 201102, China
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6
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Abstract
The generation of mice lacking SCYL1 or SCYL2 and the identification of Scyl1 as the causative gene in the motor neuron disease mouse model muscle deficient (Scyl1mdf/mdf) demonstrated the importance of the SCY1-like family of protein pseudokinases in neuronal function and survival. Several essential cellular processes such as intracellular trafficking and nuclear tRNA export are thought to be regulated by SCYL proteins. However, whether deregulation of these processes contributes to the neurodegenerative processes associated with the loss of SCYL proteins is still unclear. Here, I briefly review the evidence supporting that SCYL proteins play a role in these processes and discuss their possible involvement in the neuronal functions of SCYL proteins. I also propose ways to determine the importance of these pathways for the functions of SCYL proteins in vivo.
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Affiliation(s)
- Stephane Pelletier
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA
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7
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Wang J, Liu M, Chen L, Chan THM, Jiang L, Yuan YF, Guan XY. Overexpression of N-terminal kinase like gene promotes tumorigenicity of hepatocellular carcinoma by regulating cell cycle progression and cell motility. Oncotarget 2015; 6:1618-30. [PMID: 25575811 PMCID: PMC4359319 DOI: 10.18632/oncotarget.2730] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 11/08/2014] [Indexed: 11/25/2022] Open
Abstract
Amplification and overexpression of CHD1L is one of the most frequent genetic alterations in hepatocellular carcinoma (HCC). Here we found that one of CHD1L downstream targets, NTKL, was frequently upregulated in HCC, which was significantly correlated with vascular invasion (P = 0.012) and poor prognosis (P = 0.050) of HCC. ChIP assay demonstrated the binding of CHD1L to the promoter region of NTKL. QRT-PCR study showed that the expression of NTKL positively correlated with CHD1L expression in both clinical samples and cell lines. Functional study found that NTKL had strong oncogenic roles, including increased cell growth, colony formation in soft agar, and tumor formation in nude mice. Further study found that NTKL could promote G1/S transition by decreasing P53 and increasing CyclinD1 expressions. NTKL overexpression could accelerate the mitotic exit and chromosome segregation, which led to the cytokinesis failure and subsequently induced apoptosis. NTKL also regulated cell motility by facilitating philopodia and lamellipodia formation through regulating F-actin reorganization and the phosphorylation of small GTPase Rac1/cdc42. Using co-IP and mass spectrometry approach, we identified the large GTPase dynamin2 as an interacting protein of NTKL, which might be responsible for the phenotype alterations caused by NTKL overexpression, such as cytokinesis failure, increased cell motility and abnormal of cell division.
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Affiliation(s)
- Jian Wang
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China.,Center for Cancer Research, The University of Hong Kong, Hong Kong, China
| | - Ming Liu
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China.,Center for Cancer Research, The University of Hong Kong, Hong Kong, China
| | - Leilei Chen
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Tim Hon Man Chan
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Lingxi Jiang
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Yun-Fei Yuan
- State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xin-Yuan Guan
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China.,Center for Cancer Research, The University of Hong Kong, Hong Kong, China.,State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, China
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8
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Salt-inducible kinase 3 is a novel mitotic regulator and a target for enhancing antimitotic therapeutic-mediated cell death. Cell Death Dis 2014; 5:e1177. [PMID: 24743732 PMCID: PMC4001308 DOI: 10.1038/cddis.2014.154] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 03/02/2014] [Accepted: 03/06/2014] [Indexed: 01/29/2023]
Abstract
Many mitotic kinases are both critical for maintaining genome stability and are important targets for anticancer therapies. We provide evidence that SIK3 (salt-inducible kinase 3), an AMP-activated protein kinase-related kinase, is important for mitosis to occur properly in mammalian cells. Downregulation of SIK3 resulted in an extension of mitosis in both mouse and human cells but did not affect the DNA damage checkpoint. Time-lapse microscopy and other approaches indicated that mitotic exit but not mitotic entry was delayed. Although repression of SIK3 alone simply delayed mitotic exit, it was able to sensitize cells to various antimitotic chemicals. Both mitotic arrest and cell death caused by spindle poisons were enhanced after SIK3 depletion. Likewise, the antimitotic effects due to pharmacological inhibition of mitotic kinases including Aurora A, Aurora B, and polo-like kinase 1 were enhanced in the absence of SIK3. Finally, in addition to promoting the sensitivity of a small-molecule inhibitor of the mitotic kinesin Eg5, SIK3 depletion was able to overcome cells that developed drug resistance. These results establish the importance of SIK3 as a mitotic regulator and underscore the potential of SIK3 as a druggable antimitotic target.
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9
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Hamlin JNR, Schroeder LK, Fotouhi M, Dokainish H, Ioannou MS, Girard M, Summerfeldt N, Melançon P, McPherson PS. Scyl1 scaffolds class II Arfs to specific subcomplexes of coatomer through the γ-COP appendage domain. J Cell Sci 2014; 127:1454-63. [PMID: 24481816 DOI: 10.1242/jcs.136481] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Coatomer (COPI)-coated vesicles mediate membrane trafficking in the early secretory pathway. There are at least three subclasses of COPI coats and two classes of Arf GTPases that couple COPI coat proteins to membranes. Whether mechanisms exist to link specific Arfs to specific COPI subcomplexes is unknown. We now demonstrate that Scy1-like protein 1 (Scyl1), a member of the Scy1-like family of catalytically inactive protein kinases, oligomerizes through centrally located HEAT repeats and uses a C-terminal RKXX-COO(-) motif to interact directly with the appendage domain of coatomer subunit γ-2 (also known as COPG2 or γ2-COP). Through a distinct site, Scyl1 interacts selectively with class II Arfs, notably Arf4, thus linking class II Arfs to γ2-bearing COPI subcomplexes. Therefore, Scyl1 functions as a scaffold for key components of COPI coats, and disruption of the scaffolding function of Scyl1 causes tubulation of the endoplasmic reticulum (ER)-Golgi intermediate compartment (ERGIC) and the cis-Golgi, similar to that observed following the loss of Arf and Arf-guanine-nucleotide-exchange factor (GEF) function. Our data reveal that Scyl1 is a key organizer of a subset of the COPI machinery.
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Affiliation(s)
- Jason N R Hamlin
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC H3A 2B4, Canada
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10
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Chafe SC, Mangroo D. Scyl1 facilitates nuclear tRNA export in mammalian cells by acting at the nuclear pore complex. Mol Biol Cell 2010; 21:2483-99. [PMID: 20505071 PMCID: PMC2903676 DOI: 10.1091/mbc.e10-03-0176] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We provide evidence that Scyl1 is also a cytoplasmic component of the nuclear aminoacylation-dependent tRNA export pathway. Scyl1, like the Saccharomyces cerevisiae Cex1p, may collect aminoacyl-tRNAs from the nuclear tRNA export receptors at the cytoplasmic side of the NPC and channel them to eEF-1A for use in protein synthesis. Scyl1 is an evolutionarily conserved N-terminal protein kinase-like domain protein that plays a role in COP1-mediated retrograde protein trafficking in mammalian cells. Furthermore, loss of Scyl1 function has been shown to result in neurodegenerative disorders in mice. Here, we report that Scyl1 is also a cytoplasmic component of the mammalian nuclear tRNA export machinery. Like exportin-t, overexpression of Scyl1 restored export of a nuclear export-defective serine amber suppressor tRNA mutant in COS-7 cells. Scyl1 binds tRNA saturably, and associates with the nuclear pore complex by interacting, in part, with Nup98. Scyl1 copurifies with the nuclear tRNA export receptors exportin-t and exportin-5, the RanGTPase, and the eukaryotic elongation factor eEF-1A, which transports aminoacyl-tRNAs to the ribosomes. Scyl1 interacts directly with exportin-t and RanGTP but not with eEF-1A or RanGDP in vitro. Moreover, exportin-t containing tRNA, Scyl1, and RanGTP form a quaternary complex in vitro. Biochemical characterization also suggests that the nuclear aminoacylation-dependent pathway is primarily responsible for tRNA export in mammalian cells. These findings together suggest that Scyl1 participates in the nuclear aminoacylation-dependent tRNA export pathway and may unload aminoacyl-tRNAs from the nuclear tRNA export receptor at the cytoplasmic side of the nuclear pore complex and channels them to eEF-1A.
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Affiliation(s)
- Shawn C Chafe
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada
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11
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Mortensen KE, Conley LN, Nygaard I, Sorenesen P, Mortensen E, Bendixen C, Revhaug A. Increased sinusoidal flow is not the primary stimulus to liver regeneration. COMPARATIVE HEPATOLOGY 2010. [PMID: 20148099 DOI: 10.1186/1476.5926-9-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
BACKGROUND Hemodynamic changes in the liver remnant following partial hepatectomy (PHx) have been suggested to be a primary stimulus in triggering liver regeneration. We hypothesized that it is the increased sinusoidal flow per se and hence the shear-stress stimulus on the endothelial surface within the liver remnant which is the main stimulus to regeneration. In order to test this hypothesis we wanted to increase the sinusoidal flow without performing a concomitant liver resection. Accordingly, we constructed an aorto-portal shunt to the left portal vein branch creating a standardized four-fold increase in flow to segments II, III and IV. The impact of this manipulation was studied in both an acute model (6 animals, 9 hours) using a global porcine cDNA microarray chip and in a chronic model observing weight and histological changes (7 animals, 3 weeks). RESULTS Gene expression profiling from the shunted segments does not suggest that increased sinusoidal flow per se results in activation of genes promoting mitosis. Hyperperfusion over three weeks results in the whole liver gaining a supranormal weight of 3.9% of the total body weight (versus the normal 2.5%). Contrary to our hypothesis, the weight gain was observed on the non-shunted side without an increase in sinusoidal flow. CONCLUSIONS An isolated increase in sinusoidal flow does not have the same genetic, microscopic or macroscopic impact on the liver as that seen in the liver remnant after partial hepatectomy, indicating that increased sinusoidal flow may not be a sufficient stimulus in itself for the initiation of liver regeneration.
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Affiliation(s)
- Kim E Mortensen
- Surgical Research Laboratory, Institute of Clinical Medicine, University of Tromsoe, Tromsoe, Norway
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12
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Mortensen KE, Conley LN, Nygaard I, Sorenesen P, Mortensen E, Bendixen C, Revhaug A. Increased sinusoidal flow is not the primary stimulus to liver regeneration. COMPARATIVE HEPATOLOGY 2010; 9:2. [PMID: 20148099 PMCID: PMC2819042 DOI: 10.1186/1476-5926-9-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2009] [Accepted: 01/20/2010] [Indexed: 02/08/2023]
Abstract
BACKGROUND Hemodynamic changes in the liver remnant following partial hepatectomy (PHx) have been suggested to be a primary stimulus in triggering liver regeneration. We hypothesized that it is the increased sinusoidal flow per se and hence the shear-stress stimulus on the endothelial surface within the liver remnant which is the main stimulus to regeneration. In order to test this hypothesis we wanted to increase the sinusoidal flow without performing a concomitant liver resection. Accordingly, we constructed an aorto-portal shunt to the left portal vein branch creating a standardized four-fold increase in flow to segments II, III and IV. The impact of this manipulation was studied in both an acute model (6 animals, 9 hours) using a global porcine cDNA microarray chip and in a chronic model observing weight and histological changes (7 animals, 3 weeks). RESULTS Gene expression profiling from the shunted segments does not suggest that increased sinusoidal flow per se results in activation of genes promoting mitosis. Hyperperfusion over three weeks results in the whole liver gaining a supranormal weight of 3.9% of the total body weight (versus the normal 2.5%). Contrary to our hypothesis, the weight gain was observed on the non-shunted side without an increase in sinusoidal flow. CONCLUSIONS An isolated increase in sinusoidal flow does not have the same genetic, microscopic or macroscopic impact on the liver as that seen in the liver remnant after partial hepatectomy, indicating that increased sinusoidal flow may not be a sufficient stimulus in itself for the initiation of liver regeneration.
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Affiliation(s)
- Kim E Mortensen
- Surgical Research Laboratory, Institute of Clinical Medicine, University of Tromsoe, Tromsoe, Norway
| | - Lene N Conley
- Faculty of Agricultural Sciences, Department of Genetics and Biotechnology, University of Aarhus, Aarhus, Denmark
| | - Ingvild Nygaard
- Surgical Research Laboratory, Institute of Clinical Medicine, University of Tromsoe, Tromsoe, Norway
| | - Peter Sorenesen
- Faculty of Agricultural Sciences, Department of Genetics and Biotechnology, University of Aarhus, Aarhus, Denmark
| | - Elin Mortensen
- Department of Pathology, University Hospital of Northern-Norway, Tromsoe, Norway
| | - Christian Bendixen
- Faculty of Agricultural Sciences, Department of Genetics and Biotechnology, University of Aarhus, Aarhus, Denmark
| | - Arthur Revhaug
- Department of Gastrointestinal Surgery, University Hospital of North-Norway, Tromsoe, Norway
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Sone M, Uchida A, Komatsu A, Suzuki E, Ibuki I, Asada M, Shiwaku H, Tamura T, Hoshino M, Okazawa H, Nabeshima YI. Loss of yata, a novel gene regulating the subcellular localization of APPL, induces deterioration of neural tissues and lifespan shortening. PLoS One 2009; 4:e4466. [PMID: 19209226 PMCID: PMC2635962 DOI: 10.1371/journal.pone.0004466] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2008] [Accepted: 01/02/2009] [Indexed: 11/24/2022] Open
Abstract
Background The subcellular localization of membrane and secreted proteins is finely and dynamically regulated through intracellular vesicular trafficking for permitting various biological processes. Drosophila Amyloid precursor protein like (APPL) and Hikaru genki (HIG) are examples of proteins that show differential subcellular localization among several developmental stages. Methodology/Principal Findings During the study of the localization mechanisms of APPL and HIG, we isolated a novel mutant of the gene, CG1973, which we named yata. This molecule interacted genetically with Appl and is structurally similar to mouse NTKL/SCYL1, whose mutation was reported to cause neurodegeneration. yata null mutants showed phenotypes that included developmental abnormalities, progressive eye vacuolization, brain volume reduction, and lifespan shortening. Exogenous expression of Appl or hig in neurons partially rescued the mutant phenotypes of yata. Conversely, the phenotypes were exacerbated in double null mutants for yata and Appl. We also examined the subcellular localization of endogenous APPL and exogenously pulse-induced APPL tagged with FLAG by immunostaining the pupal brain and larval motor neurons in yata mutants. Our data revealed that yata mutants showed impaired subcellular localization of APPL. Finally, yata mutant pupal brains occasionally showed aberrant accumulation of Sec23p, a component of the COPII coat of secretory vesicles traveling from the endoplasmic reticulum (ER) to the Golgi. Conclusion/Significance We identified a novel gene, yata, which is essential for the normal development and survival of tissues. Loss of yata resulted in the progressive deterioration of the nervous system and premature lethality. Our genetic data showed a functional relationship between yata and Appl. As a candidate mechanism of the abnormalities, we found that yata regulates the subcellular localization of APPL and possibly other proteins.
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Affiliation(s)
- Masaki Sone
- Medical Top Track Program, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan.
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Burman JL, Bourbonniere L, Philie J, Stroh T, Dejgaard SY, Presley JF, McPherson PS. Scyl1, mutated in a recessive form of spinocerebellar neurodegeneration, regulates COPI-mediated retrograde traffic. J Biol Chem 2008; 283:22774-86. [PMID: 18556652 DOI: 10.1074/jbc.m801869200] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Scy1-like 1 (Scyl1), a member of the Scy1-like family of catalytically inactive protein kinases, was recently identified as the gene product altered in muscle-deficient mice, which suffer from motor neuron degeneration and cerebellar atrophy. To determine the function of Scyl1, we have now used a mass spectrometry-based screen to search for Scyl1-binding partners and identified components of coatomer I (COPI) coats. The interaction was confirmed in pull-down assays, and Scyl1 co-immunoprecipitates with betaCOP from brain lysates. Interestingly, and unique for a non-transmembrane domain protein, Scyl1 binds COPI coats using a C-terminal RKLD-COO(-) sequence, similar to the KKXX-COO(-) COPI-binding motif found in transmembrane endoplasmic reticulum (ER) proteins. Scyl1 co-localizes with betaCOP and is localized, in an Arf1-independent manner, to the ER-Golgi intermediate compartment and the cis-Golgi, sites of COPI-mediated membrane budding. The localization and binding properties of Scyl1 strongly suggest a function in COPI transport, and inhibitory RNA-mediated knock down of the protein disrupts COPI-mediated retrograde traffic of the KDEL receptor to the ER without affecting anterograde traffic from the ER. Our data demonstrate a function for Scyl1 as an accessory factor in COPI trafficking and suggest for the first time that alterations in the COPI pathway result in neurodegenerative disease.
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Affiliation(s)
- Jonathon L Burman
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC H3A 2B4, Canada
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15
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Mortensen KE, Conley LN, Hedegaard J, Kalstad T, Sorensen P, Bendixen C, Revhaug A. Regenerative response in the pig liver remnant varies with the degree of resection and rise in portal pressure. Am J Physiol Gastrointest Liver Physiol 2008; 294:G819-30. [PMID: 18187521 DOI: 10.1152/ajpgi.00179.2007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
After parenchymal loss, the liver regenerates restoring normal mass and metabolic function. Prevailing theories on triggering events leading to regeneration include humoral, metabolic, and flow-mediated mechanisms, the latter emphasizing the importance of shear stress mediated nitric oxide regulation. We aimed to investigate whether the grade of resection and hence the portal venous pressure and sinusoidal shear stress increase would be reflected in the gene expression profiles in the liver remnant by using a global porcine cDNA microarray chip with approximately 23,000 genes represented. Six pig livers were resected with 62% (low portal pressure resection) and 75% (high portal pressure resection), resulting in a portal venous pressure increase from a baseline of 6.1-8.2 and 12 mmHg, respectively. By sampling consecutive biopsies from the liver remnants, we found differentially expressed genes in the high portal pressure resection group to have functions related primarily to apoptosis, nitric oxide metabolism and oxidative stress, whereas differentially expressed genes in the low portal pressure resection group potentially regulate the cell cycle. Common to both groups was the upregulation of genes regulating inflammation, transport, cell proliferation, development, and protein metabolism. Also common to both groups was both up- and downregulation of genes regulating cell-cell signaling, signal transduction, cell adhesion, and translation. Genes regulating the metabolism of lipids, hormones, amines, and alcohol were downregulated in both groups. In conclusion, the genetic regenerative response in the liver remnant to varies according to the level of resection.
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Affiliation(s)
- Kim Erlend Mortensen
- Department of Digestive Surgery, University Hospital of Northern-Norway, Tromsø, Norway.
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16
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Sengupta S, den Boon JA, Chen IH, Newton MA, Dahl DB, Chen M, Cheng YJ, Westra WH, Chen CJ, Hildesheim A, Sugden B, Ahlquist P. Genome-wide expression profiling reveals EBV-associated inhibition of MHC class I expression in nasopharyngeal carcinoma. Cancer Res 2007; 66:7999-8006. [PMID: 16912175 DOI: 10.1158/0008-5472.can-05-4399] [Citation(s) in RCA: 184] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To identify the molecular mechanisms by which EBV-associated epithelial cancers are maintained, we measured the expression of essentially all human genes and all latent EBV genes in a collection of 31 laser-captured, microdissected nasopharyngeal carcinoma (NPC) tissue samples and 10 normal nasopharyngeal tissues. Global gene expression profiles clearly distinguished tumors from normal healthy epithelium. Expression levels of six viral genes (EBNA1, EBNA2, EBNA3A, EBNA3B, LMP1, and LMP2A) were correlated among themselves and strongly inversely correlated with the expression of a large subset of host genes. Among the human genes whose inhibition was most strongly correlated with increased EBV gene expression were multiple MHC class I HLA genes involved in regulating immune response via antigen presentation. The association between EBV gene expression and inhibition of MHC class I HLA expression implies that antigen display is either directly inhibited by EBV, facilitating immune evasion by tumor cells, and/or that tumor cells with inhibited presentation are selected for their ability to sustain higher levels of EBV to take maximum advantage of EBV oncogene-mediated tumor-promoting actions. Our data clearly reflect such tumor promotion, showing that deregulation of key proteins involved in apoptosis (BCL2-related protein A1 and Fas apoptotic inhibitory molecule), cell cycle checkpoints (AKIP, SCYL1, and NIN), and metastasis (matrix metalloproteinase 1) is closely correlated with the levels of EBV gene expression in NPC.
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Affiliation(s)
- Srikumar Sengupta
- Institute for Molecular Virology, McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53706, USA
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17
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Schmidt WM, Kraus C, Höger H, Hochmeister S, Oberndorfer F, Branka M, Bingemann S, Lassmann H, Müller M, Macedo-Souza LI, Vainzof M, Zatz M, Reis A, Bittner RE. Mutation in the Scyl1 gene encoding amino-terminal kinase-like protein causes a recessive form of spinocerebellar neurodegeneration. EMBO Rep 2007; 8:691-7. [PMID: 17571074 PMCID: PMC1905899 DOI: 10.1038/sj.embor.7401001] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Revised: 04/30/2007] [Accepted: 04/30/2007] [Indexed: 01/31/2023] Open
Abstract
Here, we show that the murine neurodegenerative disease mdf (autosomal recessive mouse mutant 'muscle deficient') is caused by a loss-of-function mutation in Scyl1, disrupting the expression of N-terminal kinase-like protein, an evolutionarily conserved putative component of the nucleocytoplasmic transport machinery. Scyl1 is prominently expressed in neurons, and enriched at central nervous system synapses and neuromuscular junctions. We show that the pathology of mdf comprises cerebellar atrophy, Purkinje cell loss and optic nerve atrophy, and therefore defines a new animal model for neurodegenerative diseases with cerebellar involvement in humans.
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Affiliation(s)
- Wolfgang M Schmidt
- Neuromuscular Research Department, Center of Anatomy & Cell Biology, Medical University of Vienna, Währinger Strasse 13, A-1090 Vienna, Austria
- Department of Clinical Pharmacology, Section of Cardiovascular Medicine, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria
| | - Cornelia Kraus
- Institute of Human Genetics, Friedrich-Alexander-University Erlangen-Nuremberg, Schwabachanlage 10, D-91054 Erlangen, Germany
| | - Harald Höger
- Division for Laboratory Animal Science and Genetics, Medical University of Vienna, Brauhausgasse 34, A-2325 Himberg, Austria
| | - Sonja Hochmeister
- Center for Brain Research, Division of Neuroimmunology, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria
| | - Felicitas Oberndorfer
- Neuromuscular Research Department, Center of Anatomy & Cell Biology, Medical University of Vienna, Währinger Strasse 13, A-1090 Vienna, Austria
| | - Manuela Branka
- Neuromuscular Research Department, Center of Anatomy & Cell Biology, Medical University of Vienna, Währinger Strasse 13, A-1090 Vienna, Austria
| | - Sonja Bingemann
- Neuromuscular Research Department, Center of Anatomy & Cell Biology, Medical University of Vienna, Währinger Strasse 13, A-1090 Vienna, Austria
| | - Hans Lassmann
- Center for Brain Research, Division of Neuroimmunology, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria
| | - Markus Müller
- Department of Clinical Pharmacology, Section of Cardiovascular Medicine, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria
| | - Lúcia Inês Macedo-Souza
- Department of Biology, Institute of Biological Sciences and Center for Study of Human Genome, University of São Paulo, Rua do Matão, 277 Cidade Universitária, São Paulo, Brazil
| | - Mariz Vainzof
- Department of Biology, Institute of Biological Sciences and Center for Study of Human Genome, University of São Paulo, Rua do Matão, 277 Cidade Universitária, São Paulo, Brazil
| | - Mayana Zatz
- Department of Biology, Institute of Biological Sciences and Center for Study of Human Genome, University of São Paulo, Rua do Matão, 277 Cidade Universitária, São Paulo, Brazil
| | - André Reis
- Institute of Human Genetics, Friedrich-Alexander-University Erlangen-Nuremberg, Schwabachanlage 10, D-91054 Erlangen, Germany
| | - Reginald E Bittner
- Neuromuscular Research Department, Center of Anatomy & Cell Biology, Medical University of Vienna, Währinger Strasse 13, A-1090 Vienna, Austria
- Tel: +43 664 80016 37514; Fax: +43 1 4277 61198; E-mail:
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18
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McGuire AT, Mangroo D. Cex1p is a novel cytoplasmic component of the Saccharomyces cerevisiae nuclear tRNA export machinery. EMBO J 2007; 26:288-300. [PMID: 17203074 PMCID: PMC1783447 DOI: 10.1038/sj.emboj.7601493] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Accepted: 11/15/2006] [Indexed: 11/08/2022] Open
Abstract
The Saccharomyces cerevisiae Yor112wp, which we named Cex1p, was identified using a yeast tRNA three-hybrid interaction approach and an in vivo nuclear tRNA export assay as a cytoplasmic component of the nuclear tRNA export machinery. Cex1p binds tRNA saturably, and associates with the nuclear pore complex by interacting directly with Nup116p. Cex1p co-purifies with the nuclear tRNA export receptors Los1p and Msn5p, the eukaryotic elongation factor eEF-1A, which delivers aminoacylated tRNAs to the ribosome, and the RanGTPase Gsp1p, but not with Cca1p, a tRNA maturation enzyme that facilitates translocation of non-aminoacylated tRNAs across the nuclear pore complex. Depletion of Cex1p and eEF-1A or Los1p significantly reduced the efficiency of nuclear tRNA export. Cex1p interacts with Los1p but not with eEF-1A in vitro. These findings suggest that Cex1p is a component of the nuclear aminoacylation-dependent tRNA export pathway in S. cerevisiae. They also suggest that Cex1p collects aminoacyl-tRNAs from the nuclear export receptors at the cytoplasmic side of the nuclear pore complex, and transfers them to eEF-1A using a channelling mechanism.
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Affiliation(s)
- Andrew T McGuire
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
| | - Dev Mangroo
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1. Tel.: +1 519 824 4120, Ext. 53432; Fax: +1 519 837 1802; E-mail:
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Zhang L, Li J, Wang C, Ma Y, Huo K. A new human gene hNTKL-BP1 interacts with hPirh2. Biochem Biophys Res Commun 2005; 330:293-7. [PMID: 15781263 DOI: 10.1016/j.bbrc.2005.02.156] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2005] [Indexed: 01/08/2023]
Abstract
NTKL (N-terminal kinase-like protein) encodes an evolutionarily conserved kinase-like protein and is mapped around chromosomal breakpoints found in several carcinomas, suggesting that NTKL dysfunction may be involved in carcinogenesis. Recently, we identified a novel mouse gene, mNTKL-BP1 (NTKL-binding protein 1), encoding a protein interacting with NTKL. For further study, a new human gene, hNTKL-BP1, which is highly homologous with mNTKL-BP1, was used as bait in yeast two-hybrid system. hPirh2 (human p53-induced RING-H2 protein) was identified as hNTKL-BP1 interacting protein. The specific interaction of two proteins was confirmed by pull-down assay in vitro and co-immunoprecipitation in vivo. Moreover, an immunofluorescent staining assay showed that hNTKL-BP1 colocalizes with hPirh2 in SMMC 7721 cells. It will stimulate further investigation into whether hNTKL-BP1 is the substrate of hPirh2 or interaction of hNTKL-BP1 with hPirh2 enhances or represses the ubiquitin-protein ligase activity of hPirh2.
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Affiliation(s)
- Liping Zhang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, PR China
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20
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Tang Z, Zhao Y, Mei F, Yang S, Li X, Lv J, Hou L, Zhang B. Molecular cloning and characterization of a human gene involved in transcriptional regulation of hTERT. Biochem Biophys Res Commun 2005; 324:1324-32. [PMID: 15504359 DOI: 10.1016/j.bbrc.2004.09.201] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2004] [Indexed: 11/21/2022]
Abstract
Human telomerase reverse transcriptase (hTERT), the catalytic subunit of telomerase in human, has been identified as the rate-limiting factor in telomerase activity, but its detailed mechanism of transcription regulation remains unclear. In this investigation, a novel human gene telomerase transcriptional elements-interacting factor (TEIF) was isolated from HeLa cell based on hTERT promoter yeast one-hybrid assay. TEIF has a 2358-bp open reading frame encoding a predicted protein of 786 amino acids, which is functionally conserved in general eukaryotic species. The transcription of TEIF was detected in cells and expressed an 86-kDa native protein, distributing mainly in cellular nuclei. Its interaction with hTERT promoter was identified and the DNA binding potential was credited to C-terminus of TEIF. Transfection of TEIF into HeLa cells presented marked transactivation of hTERT promoter and stimulated both endogenous hTERT transcription and telomerase activities. These results suggest that TEIF protein might be a transcription regulator and take part in the activation of hTERT.
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Affiliation(s)
- Zhiwei Tang
- Department of Pathology, Health Science Center of Peking University, Beijing 100083, China
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21
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Di Y, Li J, Fang J, Xu Z, He X, Zhang F, Ling J, Li X, Xu D, Li L, Li YY, Huo K. Cloning and characterization of a novel gene which encodes a protein interacting with the mitosis-associated kinase-like protein NTKL. J Hum Genet 2004; 48:315-321. [PMID: 12783284 DOI: 10.1007/s10038-003-0031-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2003] [Accepted: 04/07/2003] [Indexed: 10/25/2022]
Abstract
NTKL is an evolutionarily conserved kinase-like protein. The cell-cycle-dependent centrosomal localization of NTKL suggested that it was involved in centrosome-related cellular function. The mouse NTKL protein is highly homologous with human NTKL. A novel mouse protein was identified as an NTKL-binding protein (NTKL-BP1) by yeast two-hybrid screening, and the full-length cDNA was amplified based on the result of a sequence data analysis cloning strategy. The full-length cDNA sequence of the NTKL-BP1 gene consists of 2,537 bp, which encode 368 amino acids. A database search revealed that homologues of NTKL-BP1 exist in different organisms, including Arabidopsis thaliana, Drosophila melanogaster, Plasmodium falciparum, Geobacter metallireducens, Anopheles gambiae and human. It suggests that NTKL-BP1 is an evolutionarily conserved protein. The expression of NTKL-BP1 was observed in multiple normal mouse tissues. The interaction of the two proteins was confirmed by co-immunoprecipitation. Moreover, immunofluorescent staining indicated that NTKL and NTKL-BP1 were all localized in the cytoplasm.
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Affiliation(s)
- Yujun Di
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Jinjun Li
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, 200032, Shanghai, PR China
| | - Ji Fang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Zhigang Xu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Xianghuo He
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, 200032, Shanghai, PR China
| | - Fengrui Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, 200032, Shanghai, PR China
| | - Jiqiang Ling
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Xinrui Li
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Dongbin Xu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Li Li
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Yu-Yang Li
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China
| | - Keke Huo
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433, Shanghai, PR China.
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