1
|
Hong G, Chen W, Gong M, Wu Y, Shu G, Xiao Y, Zhang T, ShuXiong X. KAT7 suppresses tumorigenesis in clear cell renal cell carcinoma (ccRCC) by regulating cell cycle and ferroptosis sensitivity. Exp Cell Res 2024; 441:114149. [PMID: 38960363 DOI: 10.1016/j.yexcr.2024.114149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 06/23/2024] [Accepted: 06/30/2024] [Indexed: 07/05/2024]
Abstract
Clear cell renal cell carcinoma (ccRCC) is one of the most aggressive malignancies in the urological system, known for its high immunogenicity. However, its pathogenesis remains unclear. This study utilized bioinformatics algorithms and in vitro experiments to investigate the role of KAT7 in ccRCC. The results indicate that KAT7 is significantly downregulated in ccRCC tissues and cell lines, which is linked to distant metastasis and unfavorable outcomes in ccRCC patients. Overexpression of KAT7 in vitro notably decreased the proliferation, migration, and invasion of renal cancer cells and inhibited Epithelial-Mesenchymal Transition (EMT). Additionally, Gene Set Enrichment Analysis (GSEA) demonstrated that KAT7-related gene functions are associated with cell cycle and ferroptosis transcription factors. Treatment with a KAT7 acetylation inhibitor in ccRCC cell lines reversed the S phase arrest caused by KAT7 overexpression. Similarly, ferroptosis inhibitors alleviated ferroptosis induced by overexpressed KAT7. In conclusion, the findings suggest that KAT7 acts as a tumor suppressor in ccRCC by modulating the cell cycle and ferroptosis sensitivity, underscoring its potential as a therapeutic target and prognostic biomarker for renal cell carcinoma patients.
Collapse
Affiliation(s)
- GuangYi Hong
- Guizhou University Medicine College, Guiyang, 550025, Guizhou Province, China
| | - Wei Chen
- Department of Urology, Guizhou Provincial People's Hospital, No.83, East Zhongshan Road, Guiyang, Guizhou, China
| | - MaoDi Gong
- Department of Urology, Guizhou Provincial People's Hospital, No.83, East Zhongshan Road, Guiyang, Guizhou, China
| | - YiKun Wu
- Guizhou University Medicine College, Guiyang, 550025, Guizhou Province, China
| | - GuoFeng Shu
- Department of Urology, Guizhou Provincial People's Hospital, No.83, East Zhongshan Road, Guiyang, Guizhou, China
| | - Yu Xiao
- Department of Urology, Guizhou Provincial People's Hospital, No.83, East Zhongshan Road, Guiyang, Guizhou, China
| | - Tao Zhang
- Guizhou University Medicine College, Guiyang, 550025, Guizhou Province, China
| | - Xu ShuXiong
- Department of Urology, Guizhou Provincial People's Hospital, No.83, East Zhongshan Road, Guiyang, Guizhou, China.
| |
Collapse
|
2
|
Tanaka S. Interaction of replication factor Sld3 and histone acetyl transferase Esa1 alleviates gene silencing and promotes the activation of late and dormant replication origins. Genetics 2021; 217:1-11. [PMID: 33683348 DOI: 10.1093/genetics/iyaa001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 11/09/2020] [Indexed: 11/14/2022] Open
Abstract
DNA replication in eukaryotes is a multi-step process that consists of three main reactions: helicase loading (licensing), helicase activation (firing), and nascent DNA synthesis (elongation). Although the contributions of some chromatin regulatory factors in the licensing and elongation reaction have been determined, their functions in the firing reaction remain elusive. In the budding yeast Saccharomyces cerevisiae, Sld3, Sld7, and Cdc45 (3-7-45) are rate-limiting in the firing reaction and simultaneous overexpression of 3-7-45 causes untimely activation of late and dormant replication origins. Here, we found that 3-7-45 overexpression not only activated dormant origins in the silenced locus, HMLα, but also exerted an anti-silencing effect at this locus. For these, interaction between Sld3 and Esa1, a conserved histone acetyltransferase, was responsible. Moreover, the Sld3-Esa1 interaction was required for the untimely activation of late origins. These results reveal the Sld3-Esa1 interaction as a novel level of regulation in the firing reaction.
Collapse
Affiliation(s)
- Seiji Tanaka
- School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi 782-8502, Japan
| |
Collapse
|
3
|
Cho HI, Kim MS, Lee J, Yoo BC, Kim KH, Choe KM, Jang YK. BRPF3-HUWE1-mediated regulation of MYST2 is required for differentiation and cell-cycle progression in embryonic stem cells. Cell Death Differ 2020; 27:3273-3288. [PMID: 32555450 PMCID: PMC7853152 DOI: 10.1038/s41418-020-0577-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 05/22/2020] [Accepted: 06/08/2020] [Indexed: 12/16/2022] Open
Abstract
Brpf-histone acetyltransferase (HAT) complexes have important roles in embryonic development and regulating differentiation in ESCs. Among Brpf family, Brpf3 is a scaffold protein of Myst2 histone acetyltransferase complex that plays crucial roles in gene regulation, DNA replication, development as well as maintaining pluripotency in embryonic stem cells (ESCs). However, its biological functions in ESCs are not elucidated. In this study, we find out that Brpf3 protein level is critical for Myst2 stability and E3 ligase Huwe1 functions as a novel negative regulator of Myst2 via ubiquitin-mediated degradation. Importantly, Brpf3 plays an antagonistic role in Huwe1-mediated degradation of Myst2, suggesting that protein-protein interaction between Brpf3 and Myst2 is required for retaining Myst2 stability. Further, Brpf3 overexpression causes the aberrant upregulation of Myst2 protein levels which in turn induces the dysregulated cell-cycle progression and also delay of early embryonic development processes such as embryoid-body formation and lineage commitment of mouse ESCs. The Brpf3 overexpression-induced phenotypes can be reverted by Huwe1 overexpression. Together, these results may provide novel insights into understanding the functions of Brpf3 in proper differentiation as well as cell-cycle progression of ESCs via regulation of Myst2 stability by obstructing Huwe1-mediated ubiquitination. In addition, we suggest that this is a useful report which sheds light on the function of an unknown gene in ESC field.
Collapse
Affiliation(s)
- Hye In Cho
- Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
- Initiative for Biological Function & Systems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Min Seong Kim
- Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
- Initiative for Biological Function & Systems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Jina Lee
- Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
- Initiative for Biological Function & Systems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Byong Chul Yoo
- Colorectal Cancer Branch, Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Kyung Hee Kim
- Colorectal Cancer Branch, Research Institute, National Cancer Center, Goyang, Republic of Korea
- Omics Core Laboratory, Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Kwang-Min Choe
- Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
- Initiative for Biological Function & Systems, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yeun Kyu Jang
- Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea.
- Initiative for Biological Function & Systems, Yonsei University, Seoul, 03722, Republic of Korea.
| |
Collapse
|
4
|
Lan R, Wang Q. Deciphering structure, function and mechanism of lysine acetyltransferase HBO1 in protein acetylation, transcription regulation, DNA replication and its oncogenic properties in cancer. Cell Mol Life Sci 2020; 77:637-649. [PMID: 31535175 PMCID: PMC11104888 DOI: 10.1007/s00018-019-03296-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 09/06/2019] [Accepted: 09/09/2019] [Indexed: 12/19/2022]
Abstract
HBO1 complexes are major acetyltransferase responsible for histone H4 acetylation in vivo, which belongs to the MYST family. As the core catalytic subunit, HBO1 consists of an N-terminal domain and a C-terminal MYST domain that are in charge of acetyl-CoA binding and acetylation reaction. HBO1 complexes are multimeric and normally consist of two native subunits MEAF6, ING4 or ING5 and two kinds of cofactors as chromatin reader: Jade-1/2/3 and BRPF1/2/3. The choices of subunits to form the HBO1 complexes provide a regulatory switch to potentiate its activity between histone H4 and H3 tails. Thus, HBO1 complexes present multiple functions in histone acetylation, gene transcription, DNA replication, protein ubiquitination, and immune regulation, etc. HBO1 is a co-activator for CDT1 to facilitate chromatin loading of MCM complexes and promotes DNA replication licensing. This process is regulated by mitotic kinases such as CDK1 and PLK1 by phosphorylating HBO1 and modulating its acetyltransferase activity, therefore, connecting histone acetylation to regulations of cell cycle and DNA replication. In addition, both gene amplification and protein overexpression of HBO1 confirmed its oncogenic role in cancers. In this paper, we review the recent advances and discuss our understanding of the multiple functions, activity regulation, and disease relationship of HBO1.
Collapse
Affiliation(s)
- Rongfeng Lan
- Department of Cell Biology and Medical Genetics, School of Basic Medical Sciences, Shenzhen University Health Science Center, Shenzhen, 518060, China.
| | - Qianqian Wang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Lifeomics, National Center for Protein Sciences (The PHOENIX Center, Beijing), Beijing, 102206, China
| |
Collapse
|
5
|
Lu F, Wu X, Yin F, Chia-Fang Lee C, Yu M, Mihaylov IS, Yu J, Sun H, Zhang H. Regulation of DNA replication and chromosomal polyploidy by the MLL-WDR5-RBBP5 methyltransferases. Biol Open 2016; 5:1449-1460. [PMID: 27744293 PMCID: PMC5087680 DOI: 10.1242/bio.019729] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
DNA replication licensing occurs on chromatin, but how the chromatin template is regulated for replication remains mostly unclear. Here, we have analyzed the requirement of histone methyltransferases for a specific type of replication: the DNA re-replication induced by the downregulation of either Geminin, an inhibitor of replication licensing protein CDT1, or the CRL4CDT2 ubiquitin E3 ligase. We found that siRNA-mediated reduction of essential components of the MLL-WDR5-RBBP5 methyltransferase complexes including WDR5 or RBBP5, which transfer methyl groups to histone H3 at K4 (H3K4), suppressed DNA re-replication and chromosomal polyploidy. Reduction of WDR5/RBBP5 also prevented the activation of H2AX checkpoint caused by re-replication, but not by ultraviolet or X-ray irradiation; and the components of MLL complexes co-localized with the origin recognition complex (ORC) and MCM2-7 replicative helicase complexes at replication origins to control the levels of methylated H3K4. Downregulation of WDR5 or RBBP5 reduced the methylated H3K4 and suppressed the recruitment of MCM2-7 complexes onto replication origins. Our studies indicate that the MLL complexes and H3K4 methylation are required for DNA replication but not for DNA damage repair. Summary: DNA replication or re-replication of DNA induced after loss of Geminin or CLR4CDT2 is regulated by the methylation activities of the MLL-WDR5-RBBP5 methyltransferases on histone H3 at lysine 4 (H3K4).
Collapse
Affiliation(s)
- Fei Lu
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, China Basic Science Division, Nevada Cancer Institute, Las Vegas, NV 89135, USA
| | - Xiaojun Wu
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, China
| | - Feng Yin
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, China
| | | | - Min Yu
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, Guangdong 518055, China
| | - Ivailo S Mihaylov
- Basic Science Division, Nevada Cancer Institute, Las Vegas, NV 89135, USA
| | - Jiekai Yu
- Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, NV 89154, USA
| | - Hong Sun
- Basic Science Division, Nevada Cancer Institute, Las Vegas, NV 89135, USA Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, NV 89154, USA
| | - Hui Zhang
- Basic Science Division, Nevada Cancer Institute, Las Vegas, NV 89135, USA Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, NV 89154, USA
| |
Collapse
|
6
|
Giri S, Chakraborty A, Sathyan KM, Prasanth KV, Prasanth SG. Orc5 induces large-scale chromatin decondensation in a GCN5-dependent manner. J Cell Sci 2015; 129:417-29. [PMID: 26644179 DOI: 10.1242/jcs.178889] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 11/27/2015] [Indexed: 12/11/2022] Open
Abstract
In eukaryotes, origin recognition complex (ORC) proteins establish the pre-replicative complex (preRC) at the origins, and this is essential for the initiation of DNA replication. Open chromatin structures regulate the efficiency of preRC formation and replication initiation. However, the molecular mechanisms that control chromatin structure, and how the preRC components establish themselves on the chromatin remain to be understood. In human cells, the ORC is a highly dynamic complex with many separate functions attributed to sub-complexes or individual subunits of the ORC, including heterochromatin organization, telomere and centromere function, centrosome duplication and cytokinesis. We demonstrate that human Orc5, unlike other ORC subunits, when ectopically tethered to a chromatin locus, induces large-scale chromatin decondensation, predominantly during G1 phase of the cell cycle. Orc5 associates with the H3 histone acetyl transferase GCN5 (also known as KAT2A), and this association enhances the chromatin-opening function of Orc5. In the absence of Orc5, histone H3 acetylation is decreased at the origins. We propose that the ability of Orc5 to induce chromatin unfolding during G1 allows the establishment of the preRC at the origins.
Collapse
Affiliation(s)
- Sumanprava Giri
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Arindam Chakraborty
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Kizhakke M Sathyan
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Kannanganattu V Prasanth
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Supriya G Prasanth
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| |
Collapse
|
7
|
Bailly A, Perrin A, Bou Malhab LJ, Pion E, Larance M, Nagala M, Smith P, O'Donohue MF, Gleizes PE, Zomerdijk J, Lamond AI, Xirodimas DP. The NEDD8 inhibitor MLN4924 increases the size of the nucleolus and activates p53 through the ribosomal-Mdm2 pathway. Oncogene 2015; 35:415-26. [PMID: 25867069 DOI: 10.1038/onc.2015.104] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 02/10/2015] [Accepted: 03/03/2015] [Indexed: 12/19/2022]
Abstract
The ubiquitin-like molecule NEDD8 is essential for viability, growth and development, and is a potential target for therapeutic intervention. We found that the small molecule inhibitor of NEDDylation, MLN4924, alters the morphology and increases the surface size of the nucleolus in human and germline cells of Caenorhabditis elegans in the absence of nucleolar fragmentation. SILAC proteomics and monitoring of rRNA production, processing and ribosome profiling shows that MLN4924 changes the composition of the nucleolar proteome but does not inhibit RNA Pol I transcription. Further analysis demonstrates that MLN4924 activates the p53 tumour suppressor through the RPL11/RPL5-Mdm2 pathway, with characteristics of nucleolar stress. The study identifies the nucleolus as a target of inhibitors of NEDDylation and provides a mechanism for p53 activation upon NEDD8 inhibition. It also indicates that targeting the nucleolar proteome without affecting nucleolar transcription initiates the required signalling events for the control of cell cycle regulators.
Collapse
Affiliation(s)
- A Bailly
- Centre de Recherche de Biochimie Macromoléculaire-UMR 5237, CNRS, Montpellier, France
| | - A Perrin
- Centre de Recherche de Biochimie Macromoléculaire-UMR 5237, CNRS, Montpellier, France
| | - L J Bou Malhab
- Centre de Recherche de Biochimie Macromoléculaire-UMR 5237, CNRS, Montpellier, France
| | - E Pion
- Centre de Recherche de Biochimie Macromoléculaire-UMR 5237, CNRS, Montpellier, France
| | - M Larance
- Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland/UK
| | - M Nagala
- Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland/UK
| | - P Smith
- Millennium Pharmaceuticals Inc., Cambridge, MA, USA
| | - M-F O'Donohue
- Laboratoire de Biologie Moléculaire Eucaryote, UMR CNRS 5099, Bâtiment IBCG, Toulouse, France
| | - P-E Gleizes
- Laboratoire de Biologie Moléculaire Eucaryote, UMR CNRS 5099, Bâtiment IBCG, Toulouse, France
| | - J Zomerdijk
- Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland/UK
| | - A I Lamond
- Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland/UK
| | - D P Xirodimas
- Centre de Recherche de Biochimie Macromoléculaire-UMR 5237, CNRS, Montpellier, France
| |
Collapse
|
8
|
Linzen U, Lilischkis R, Pandithage R, Schilling B, Ullius A, Lüscher-Firzlaff J, Kremmer E, Lüscher B, Vervoorts J. ING5 is phosphorylated by CDK2 and controls cell proliferation independently of p53. PLoS One 2015; 10:e0123736. [PMID: 25860957 PMCID: PMC4393124 DOI: 10.1371/journal.pone.0123736] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 02/27/2015] [Indexed: 11/19/2022] Open
Abstract
Inhibitor of growth (ING) proteins have multiple functions in the control of cell proliferation, mainly by regulating processes associated with chromatin regulation and gene expression. ING5 has been described to regulate aspects of gene transcription and replication. Moreover deregulation of ING5 is observed in different tumors, potentially functioning as a tumor suppressor. Gene transcription in late G1 and in S phase and replication is regulated by cyclin-dependent kinase 2 (CDK2) in complex with cyclin E or cyclin A. CDK2 complexes phosphorylate and regulate several substrate proteins relevant for overcoming the restriction point and promoting S phase. We have identified ING5 as a novel CDK2 substrate. ING5 is phosphorylated at a single site, threonine 152, by cyclin E/CDK2 and cyclin A/CDK2 in vitro. This site is also phosphorylated in cells in a cell cycle dependent manner, consistent with it being a CDK2 substrate. Furthermore overexpression of cyclin E/CDK2 stimulates while the CDK2 inhibitor p27KIP1 represses phosphorylation at threonine 152. This site is located in a bipartite nuclear localization sequence but its phosphorylation was not sufficient to deregulate the subcellular localization of ING5. Although ING5 interacts with the tumor suppressor p53, we could not establish p53-dependent regulation of cell proliferation by ING5 and by phospho-site mutants. Instead we observed that the knockdown of ING5 resulted in a strong reduction of proliferation in different tumor cell lines, irrespective of the p53 status. This inhibition of proliferation was at least in part due to the induction of apoptosis. In summary we identified a phosphorylation site at threonine 152 of ING5 that is cell cycle regulated and we observed that ING5 is necessary for tumor cell proliferation, without any apparent dependency on the tumor suppressor p53.
Collapse
Affiliation(s)
- Ulrike Linzen
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
| | - Richard Lilischkis
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
| | - Ruwin Pandithage
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
| | - Britta Schilling
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
| | - Andrea Ullius
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
| | - Juliane Lüscher-Firzlaff
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
| | - Elisabeth Kremmer
- Helmholtz Zentrum München, Institute of Molecular Immunology, Marchioninistrasse 25, 81377, München, Germany
| | - Bernhard Lüscher
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
- * E-mail: (BL); (JV)
| | - Jörg Vervoorts
- Institute of Biochemistry and Molecular Biology, Medical School, RWTH Aachen University, Pauwelsstrasse 30, 52057, Aachen, Germany
- * E-mail: (BL); (JV)
| |
Collapse
|
9
|
Zou C, Chen Y, Smith RM, Snavely C, Li J, Coon TA, Chen BB, Zhao Y, Mallampalli RK. SCF(Fbxw15) mediates histone acetyltransferase binding to origin recognition complex (HBO1) ubiquitin-proteasomal degradation to regulate cell proliferation. J Biol Chem 2013; 288:6306-16. [PMID: 23319590 DOI: 10.1074/jbc.m112.426882] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Histone acetyltransferase binding to origin recognition complex (HBO1) plays a crucial role in DNA replication licensing and cell proliferation, yet its molecular regulation in cells is relatively unknown. Here an uncharacterized protein, Fbxw15, directly interacts with HBO1, a labile protein (t½ = ∼3 h), to mediate its ubiquitination (Lys(338)) and degradation in the cytoplasm. Fbxw15-mediated HBO1 depletion required mitogen-activated protein kinase 1 (Mek1), which was sufficient to trigger HBO1 phosphorylation and degradation in cells. Mek1 ability to produce HBO1 degradation was blocked by Fbxw15 silencing. Lipopolysaccharide induced HBO1 degradation, an effect abrogated by Fbxw15 or Mek1 cellular depletion. Modulation of Fbxw15 levels was able to differentially regulate histone H3K14 acetylation and cellular proliferation by altering HBO1 levels. These studies authenticate Fbxw15 as a ubiquitin E3 ligase subunit that mediates endotoxin-induced HBO1 depletion in cells, thereby controlling cell replicative capacity.
Collapse
Affiliation(s)
- Chunbin Zou
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Li Y, Xiao H, de Renty C, Jaramillo-Lambert A, Han Z, DePamphilis ML, Brown KJ, Zhu W. The involvement of acidic nucleoplasmic DNA-binding protein (And-1) in the regulation of prereplicative complex (pre-RC) assembly in human cells. J Biol Chem 2012; 287:42469-79. [PMID: 23093411 DOI: 10.1074/jbc.m112.404277] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
DNA replication in all eukaryotes starts with the process of loading the replicative helicase MCM2-7 onto chromatin during late mitosis of the cell cycle. MCM2-7 is a key component of the prereplicative complex (pre-RC), which is loaded onto chromatin by the concerted action of origin recognition complex, Cdc6, and Cdt1. Here, we demonstrate that And-1 is assembled onto chromatin in late mitosis and early G(1) phase before the assembly of pre-RC in human cells. And-1 forms complexes with MCM2-7 to facilitate the assembly of MCM2-7 onto chromatin at replication origins in late mitosis and G(1) phase. We also present data to show that depletion of And-1 significantly reduces the interaction between Cdt1 and MCM7 in G(1) phase cells. Thus, human And-1 facilitates loading of the MCM2-7 helicase onto chromatin during the assembly of pre-RC.
Collapse
Affiliation(s)
- Yongming Li
- Department of Biochemistry and Molecular Biology, The George Washington University Medical School, Washington, D. C. 20037, USA
| | | | | | | | | | | | | | | |
Collapse
|
11
|
The chromatin backdrop of DNA replication: lessons from genetics and genome-scale analyses. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2012; 1819:794-801. [PMID: 22342530 DOI: 10.1016/j.bbagrm.2012.01.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 01/27/2012] [Accepted: 01/31/2012] [Indexed: 01/04/2023]
Abstract
The entire cellular genome must replicate during each cell cycle, but it is yet unclear how replication proceeds along with chromatin condensation and remodeling while ensuring the fidelity of the replicated genome. Mapping replication initiation sites can provide clues for the coordination of DNA replication and transcription on a whole-genome scale. Here we discuss recent insights obtained from genome-scale analyses of replication initiation sites and transcription in mammalian cells and ask how transcription and chromatin modifications affect the frequency of replication initiation events. We also discuss DNA sequences, such as insulators and replicators, which modulate replication and transcription of target genes, and use genome-wide maps of replication initiation sites to evaluate possible commonalities between replicators and chromatin insulators. This article is part of a Special Issue entitled: Chromatin in time and space.
Collapse
|