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起始點識別複合物

分子生物學中,起始點識別複合物[2](origin recognition complex, ORC)是指一種真核生物體內的含有多個亞基、與DNA結合的複合物。它與DNA通過一種ATP依賴性的方式相連,使得DNA複製得以啓動。該複合物的幾個亞基分別由ORC1英语ORC1ORC2英语ORC2LORC3英语ORC3LORC4英语ORC4LORC5英语ORC5LORC6英语ORC6L基因編碼[3][4][5]。起始點識別複合物不僅在真核生物DNA複製期間存在,在整個細胞週期的其餘時段也與複製起點結合[6]。起始點識別複合物對DNA複製的啓動來說不可或缺[7][8][9]。與複製起點結合的起始點識別複合物使得複製前複合物英语pre-replication complex(pre-replication complex, pre-RC)得以組裝。複製前複合物的組分包括Cdc6英语Cdc6、Tah11(亦稱Cdt1英语Cdt1),以及MCM2英语MCM2-MCM7英语MCM7複合物[10][11][12]。複製前複合物在G1期的組裝對於S期的DNA複製前的DNA複製許可英语licensing factor至關重要。不經過許可,DNA複製就無法進行[13][14][15]週期素依賴性蛋白激酶Cdc28英语Cdc28能磷酸化Orc2、Orc6、Cdc6,以調節DNA複製的起始(包括封鎖G2/M期的複製再啓動),進而達到調節細胞週期的目的[6][16][17][18]

起始點識別複合物(ORC)亞基2
鑑定
標誌ORC2
PfamPF04084
InterPro英语InterProIPR007220
現有可用的蛋白結構:
Pfam結構 / ECOD
PDBRCSB PDB; PDBe; PDBj
PDBsum英语PDBsum結構概要
起始點識別複合物亞基(ORC)亞基3N-端
鑑定
標誌ORC3_N
PfamPF07034
InterPro英语InterProIPR010748
現有可用的蛋白結構:
Pfam結構 / ECOD
PDBRCSB PDB; PDBe; PDBj
PDBsum英语PDBsum結構概要
起始點識別複合物亞基(ORC)亞基6
鑑定
標誌ORC6
PfamPF05460
InterPro英语InterProIPR008721
現有可用的蛋白結構:
Pfam結構 / ECOD
PDBRCSB PDB; PDBe; PDBj
PDBsum英语PDBsum結構概要
CDC6在DNA複製起始中可能發揮的作用[1]

酵母細胞中,起始點識別複合物亦參與交配型英语Mating of yeast相關的基因位點HML和HMR的沉默[7][8][9]。起始點識別複合物參與HML、HMR位點的染色質組裝,讓Sirl沉默蛋白裝入染色質中,使得這兩個位點沉默[9][19][20]

Orc1以及Orc5這兩個起始點識別複合物的亞基均與ATP結合,不過只有Orc1具有ATP酶活性[21]。Orc1與ATP的結合使起始點識別複合物得以與DNA結合,對細胞的生存至關重要[12]。另外,Orc1的ATP酶活性亦與複製前複合物的生成有關[22][23][24]。而Orc5與ATP的結合則使得起始點識別複合物能作爲一個整體穩定存在。只有Orc1到Orc5這5個亞基對複合物與複製起點的結合是必需的。Orc6則能使複製前複合物在合成之後能穩定存在[25]。對起始點識別複合物內部的相互作用的研究表明,Orc2、Orc3、Orc6可能組成了複合物的核心部分[6]

參考文獻

  1. ^ Borlado LR, Méndez J. CDC6: from DNA replication to cell cycle checkpoints and oncogenesis. Carcinogenesis. February 2008, 29 (2): 237–43. PMID 18048387. doi:10.1093/carcin/bgm268. 
  2. ^ 譯名來自:朱玉賢等. 《分子生物學》 第三版. 2008: pp.49. ISBN 978-7-04-022214-2. 
  3. ^ 醫學主題詞表(MeSH)Origin+Recognition+Complex
  4. ^ Dutta A, Bell SP. Initiation of DNA replication in eukaryotic cells. Annu. Rev. Cell Dev. Biol. 1997, 13: 293–332. PMID 9442876. doi:10.1146/annurev.cellbio.13.1.293. 
  5. ^ Chesnokov IN. Multiple functions of the origin recognition complex. Int. Rev. Cytol. 2007, 256: 69–109. PMID 17241905. doi:10.1016/S0074-7696(07)56003-1. 
  6. ^ 6.0 6.1 6.2 Matsuda K, Makise M, Sueyasu Y, Takehara M, Asano T, Mizushima T. Yeast two-hybrid analysis of the origin recognition complex of Saccharomyces cerevisiae: interaction between subunits and identification of binding proteins. FEMS Yeast Res. December 2007, 7 (8): 1263–9. PMID 17825065. doi:10.1111/j.1567-1364.2007.00298.x. 
  7. ^ 7.0 7.1 Bell SP, Stillman B. ATP-dependent recognition of eukaryotic origins of DNA replication by a multiprotein complex. Nature. May 1992, 357 (6374): 128–34. PMID 1579162. doi:10.1038/357128a0. 
  8. ^ 8.0 8.1 Bell SP, Mitchell J, Leber J, Kobayashi R, Stillman B. The multidomain structure of Orc1p reveals similarity to regulators of DNA replication and transcriptional silencing. Cell. November 1995, 83 (4): 563–8. PMID 7585959. doi:10.1016/0092-8674(95)90096-9. 
  9. ^ 9.0 9.1 9.2 Gibson DG, Bell SP, Aparicio OM. Cell cycle execution point analysis of ORC function and characterization of the checkpoint response to ORC inactivation in Saccharomyces cerevisiae. Genes Cells. June 2006, 11 (6): 557–73. PMID 16716188. doi:10.1111/j.1365-2443.2006.00967.x. 
  10. ^ Rao H, Stillman B. The origin recognition complex interacts with a bipartite DNA binding site within yeast replicators. Proc. Natl. Acad. Sci. U.S.A. March 1995, 92 (6): 2224–8. PMC 42456 . PMID 7892251. doi:10.1073/pnas.92.6.2224. 
  11. ^ Rowley A, Cocker JH, Harwood J, Diffley JF. Initiation complex assembly at budding yeast replication origins begins with the recognition of a bipartite sequence by limiting amounts of the initiator, ORC. EMBO J. June 1995, 14 (11): 2631–41. PMC 398377 . PMID 7781615. 
  12. ^ 12.0 12.1 Speck C, Chen Z, Li H, Stillman B. ATPase-dependent cooperative binding of ORC and Cdc6 to origin DNA. Nat. Struct. Mol. Biol. November 2005, 12 (11): 965–71. PMC 2952294 . PMID 16228006. doi:10.1038/nsmb1002. 
  13. ^ Kelly TJ, Brown GW. Regulation of chromosome replication. Annu. Rev. Biochem. 2000, 69: 829–80. PMID 10966477. doi:10.1146/annurev.biochem.69.1.829. 
  14. ^ Bell SP, Dutta A. DNA replication in eukaryotic cells. Annu. Rev. Biochem. 2002, 71: 333–74. PMID 12045100. doi:10.1146/annurev.biochem.71.110601.135425. 
  15. ^ Stillman B. Origin recognition and the chromosome cycle. FEBS Lett. February 2005, 579 (4): 877–84. PMID 15680967. doi:10.1016/j.febslet.2004.12.011. 
  16. ^ Weinreich M, Liang C, Chen HH, Stillman B. Binding of cyclin-dependent kinases to ORC and Cdc6p regulates the chromosome replication cycle. Proc. Natl. Acad. Sci. U.S.A. September 2001, 98 (20): 11211–7. PMC 58709 . PMID 11572976. doi:10.1073/pnas.201387198. 
  17. ^ Nguyen VQ, Co C, Li JJ. Cyclin-dependent kinases prevent DNA re-replication through multiple mechanisms. Nature. June 2001, 411 (6841): 1068–73. PMID 11429609. doi:10.1038/35082600. 
  18. ^ Archambault V, Ikui AE, Drapkin BJ, Cross FR. Disruption of mechanisms that prevent rereplication triggers a DNA damage response. Mol. Cell. Biol. August 2005, 25 (15): 6707–21. PMC 1190345 . PMID 16024805. doi:10.1128/MCB.25.15.6707-6721.2005. 
  19. ^ Triolo T, Sternglanz R. Role of interactions between the origin recognition complex and SIR1 in transcriptional silencing. Nature. May 1996, 381 (6579): 251–3. PMID 8622770. doi:10.1038/381251a0. 
  20. ^ Fox CA, Ehrenhofer-Murray AE, Loo S, Rine J. The origin recognition complex, SIR1, and the S phase requirement for silencing. Science. June 1997, 276 (5318): 1547–51. PMID 9171055. doi:10.1126/science.276.5318.1547. 
  21. ^ Klemm RD, Austin RJ, Bell SP. Coordinate binding of ATP and origin DNA regulates the ATPase activity of the origin recognition complex. Cell. February 1997, 88 (4): 493–502. PMID 9038340. doi:10.1016/S0092-8674(00)81889-9. 
  22. ^ Klemm RD, Bell SP. ATP bound to the origin recognition complex is important for preRC formation. Proc. Natl. Acad. Sci. U.S.A. July 2001, 98 (15): 8361–7. PMC 37444 . PMID 11459976. doi:10.1073/pnas.131006898. 
  23. ^ Bowers JL, Randell JC, Chen S, Bell SP. ATP hydrolysis by ORC catalyzes reiterative Mcm2-7 assembly at a defined origin of replication. Mol. Cell. December 2004, 16 (6): 967–78. PMID 15610739. doi:10.1016/j.molcel.2004.11.038. 
  24. ^ Randell JC, Bowers JL, Rodriguez HK, Bell SP. Sequential ATP hydrolysis by Cdc6 and ORC directs loading of the Mcm2-7 helicase. Mol. Cell. January 2006, 21 (1): 29–39. PMID 16387651. doi:10.1016/j.molcel.2005.11.023. 
  25. ^ Semple JW, Da-Silva LF, Jervis EJ, Ah-Kee J, Al-Attar H, Kummer L, Heikkila JJ, Pasero P, Duncker BP. An essential role for Orc6 in DNA replication through maintenance of pre-replicative complexes. EMBO J. November 2006, 25 (21): 5150–8. PMC 1630405 . PMID 17053779. doi:10.1038/sj.emboj.7601391. 

拓展閱讀

  • Stephen P. Bell and Anindya Dutta, DNA REPLICATION IN EUKARYOTIC CELLS, Annual Review of Biochemistry, 2002. doi:10.1146/annurev.biochem.71.110601.135425. A comprehensive review of molecular DNA replication.

此条目包含有源于Pfam以及InterPro的属于公有领域的文本 IPR007220

此条目包含有源于Pfam以及InterPro的属于公有领域的文本 IPR010748

此条目包含有源于Pfam以及InterPro的属于公有领域的文本 IPR008721

起始點識別複合物, 在分子生物學中, origin, recognition, complex, 是指一種真核生物體內的含有多個亞基, 與dna結合的複合物, 它與dna通過一種atp依賴性的方式相連, 使得dna複製得以啓動, 該複合物的幾個亞基分別由orc1, 英语, orc1, orc2, 英语, orc2l, orc3, 英语, orc3l, orc4, 英语, orc4l, orc5, 英语, orc5l, orc6, 英语, orc6l, 基因編碼, 不僅在真核生物dna複製期間存在, 在整個細胞週期的. 在分子生物學中 起始點識別複合物 2 origin recognition complex ORC 是指一種真核生物體內的含有多個亞基 與DNA結合的複合物 它與DNA通過一種ATP依賴性的方式相連 使得DNA複製得以啓動 該複合物的幾個亞基分別由ORC1 英语 ORC1 ORC2 英语 ORC2L ORC3 英语 ORC3L ORC4 英语 ORC4L ORC5 英语 ORC5L ORC6 英语 ORC6L 基因編碼 3 4 5 起始點識別複合物不僅在真核生物DNA複製期間存在 在整個細胞週期的其餘時段也與複製起點結合 6 起始點識別複合物對DNA複製的啓動來說不可或缺 7 8 9 與複製起點結合的起始點識別複合物使得複製前複合物 英语 pre replication complex pre replication complex pre RC 得以組裝 複製前複合物的組分包括Cdc6 英语 Cdc6 Tah11 亦稱Cdt1 英语 Cdt1 以及MCM2 英语 MCM2 MCM7 英语 MCM7 複合物 10 11 12 複製前複合物在G1期的組裝對於S期的DNA複製前的DNA複製許可 英语 licensing factor 至關重要 不經過許可 DNA複製就無法進行 13 14 15 週期素依賴性蛋白激酶Cdc28 英语 Cdc28 能磷酸化Orc2 Orc6 Cdc6 以調節DNA複製的起始 包括封鎖G2 M期的複製再啓動 進而達到調節細胞週期的目的 6 16 17 18 起始點識別複合物 ORC 亞基2鑑定標誌ORC2PfamPF04084InterPro 英语 InterPro IPR007220現有可用的蛋白結構 Pfam結構 ECODPDBRCSB PDB PDBe PDBjPDBsum 英语 PDBsum 結構概要起始點識別複合物亞基 ORC 亞基3N 端鑑定標誌ORC3 NPfamPF07034InterPro 英语 InterPro IPR010748現有可用的蛋白結構 Pfam結構 ECODPDBRCSB PDB PDBe PDBjPDBsum 英语 PDBsum 結構概要起始點識別複合物亞基 ORC 亞基6鑑定標誌ORC6PfamPF05460InterPro 英语 InterPro IPR008721現有可用的蛋白結構 Pfam結構 ECODPDBRCSB PDB PDBe PDBjPDBsum 英语 PDBsum 結構概要CDC6在DNA複製起始中可能發揮的作用 1 在酵母細胞中 起始點識別複合物亦參與交配型 英语 Mating of yeast 相關的基因位點HML和HMR的沉默 7 8 9 起始點識別複合物參與HML HMR位點的染色質組裝 讓Sirl沉默蛋白裝入染色質中 使得這兩個位點沉默 9 19 20 Orc1以及Orc5這兩個起始點識別複合物的亞基均與ATP結合 不過只有Orc1具有ATP酶活性 21 Orc1與ATP的結合使起始點識別複合物得以與DNA結合 對細胞的生存至關重要 12 另外 Orc1的ATP酶活性亦與複製前複合物的生成有關 22 23 24 而Orc5與ATP的結合則使得起始點識別複合物能作爲一個整體穩定存在 只有Orc1到Orc5這5個亞基對複合物與複製起點的結合是必需的 Orc6則能使複製前複合物在合成之後能穩定存在 25 對起始點識別複合物內部的相互作用的研究表明 Orc2 Orc3 Orc6可能組成了複合物的核心部分 6 參考文獻 编辑 Borlado LR Mendez J CDC6 from DNA replication to cell cycle checkpoints and oncogenesis Carcinogenesis February 2008 29 2 237 43 PMID 18048387 doi 10 1093 carcin bgm268 譯名來自 朱玉賢等 分子生物學 第三版 2008 pp 49 ISBN 978 7 04 022214 2 引文格式1维护 冗余文本 link 醫學主題詞表 MeSH Origin Recognition Complex Dutta A Bell SP Initiation of DNA replication in eukaryotic cells Annu Rev Cell Dev Biol 1997 13 293 332 PMID 9442876 doi 10 1146 annurev cellbio 13 1 293 Chesnokov IN Multiple functions of the origin recognition complex Int Rev Cytol 2007 256 69 109 PMID 17241905 doi 10 1016 S0074 7696 07 56003 1 6 0 6 1 6 2 Matsuda K Makise M Sueyasu Y Takehara M Asano T Mizushima T Yeast two hybrid analysis of the origin recognition complex of Saccharomyces cerevisiae interaction between subunits and identification of binding proteins FEMS Yeast Res December 2007 7 8 1263 9 PMID 17825065 doi 10 1111 j 1567 1364 2007 00298 x 7 0 7 1 Bell SP Stillman B ATP dependent recognition of eukaryotic origins of DNA replication by a multiprotein complex Nature May 1992 357 6374 128 34 PMID 1579162 doi 10 1038 357128a0 8 0 8 1 Bell SP Mitchell J Leber J Kobayashi R Stillman B The multidomain structure of Orc1p reveals similarity to regulators of DNA replication and transcriptional silencing Cell November 1995 83 4 563 8 PMID 7585959 doi 10 1016 0092 8674 95 90096 9 9 0 9 1 9 2 Gibson DG Bell SP Aparicio OM Cell cycle execution point analysis of ORC function and characterization of the checkpoint response to ORC inactivation in Saccharomyces cerevisiae Genes Cells June 2006 11 6 557 73 PMID 16716188 doi 10 1111 j 1365 2443 2006 00967 x Rao H Stillman B The origin recognition complex interacts with a bipartite DNA binding site within yeast replicators Proc Natl Acad Sci U S A March 1995 92 6 2224 8 PMC 42456 PMID 7892251 doi 10 1073 pnas 92 6 2224 Rowley A Cocker JH Harwood J Diffley JF Initiation complex assembly at budding yeast replication origins begins with the recognition of a bipartite sequence by limiting amounts of the initiator ORC EMBO J June 1995 14 11 2631 41 PMC 398377 PMID 7781615 12 0 12 1 Speck C Chen Z Li H Stillman B ATPase dependent cooperative binding of ORC and Cdc6 to origin DNA Nat Struct Mol Biol November 2005 12 11 965 71 PMC 2952294 PMID 16228006 doi 10 1038 nsmb1002 Kelly TJ Brown GW Regulation of chromosome replication Annu Rev Biochem 2000 69 829 80 PMID 10966477 doi 10 1146 annurev biochem 69 1 829 Bell SP Dutta A DNA replication in eukaryotic cells Annu Rev Biochem 2002 71 333 74 PMID 12045100 doi 10 1146 annurev biochem 71 110601 135425 Stillman B Origin recognition and the chromosome cycle FEBS Lett February 2005 579 4 877 84 PMID 15680967 doi 10 1016 j febslet 2004 12 011 Weinreich M Liang C Chen HH Stillman B Binding of cyclin dependent kinases to ORC and Cdc6p regulates the chromosome replication cycle Proc Natl Acad Sci U S A September 2001 98 20 11211 7 PMC 58709 PMID 11572976 doi 10 1073 pnas 201387198 Nguyen VQ Co C Li JJ Cyclin dependent kinases prevent DNA re replication through multiple mechanisms Nature June 2001 411 6841 1068 73 PMID 11429609 doi 10 1038 35082600 Archambault V Ikui AE Drapkin BJ Cross FR Disruption of mechanisms that prevent rereplication triggers a DNA damage response Mol Cell Biol August 2005 25 15 6707 21 PMC 1190345 PMID 16024805 doi 10 1128 MCB 25 15 6707 6721 2005 Triolo T Sternglanz R Role of interactions between the origin recognition complex and SIR1 in transcriptional silencing Nature May 1996 381 6579 251 3 PMID 8622770 doi 10 1038 381251a0 Fox CA Ehrenhofer Murray AE Loo S Rine J The origin recognition complex SIR1 and the S phase requirement for silencing Science June 1997 276 5318 1547 51 PMID 9171055 doi 10 1126 science 276 5318 1547 Klemm RD Austin RJ Bell SP Coordinate binding of ATP and origin DNA regulates the ATPase activity of the origin recognition complex Cell February 1997 88 4 493 502 PMID 9038340 doi 10 1016 S0092 8674 00 81889 9 Klemm RD Bell SP ATP bound to the origin recognition complex is important for preRC formation Proc Natl Acad Sci U S A July 2001 98 15 8361 7 PMC 37444 PMID 11459976 doi 10 1073 pnas 131006898 Bowers JL Randell JC Chen S Bell SP ATP hydrolysis by ORC catalyzes reiterative Mcm2 7 assembly at a defined origin of replication Mol Cell December 2004 16 6 967 78 PMID 15610739 doi 10 1016 j molcel 2004 11 038 Randell JC Bowers JL Rodriguez HK Bell SP Sequential ATP hydrolysis by Cdc6 and ORC directs loading of the Mcm2 7 helicase Mol Cell January 2006 21 1 29 39 PMID 16387651 doi 10 1016 j molcel 2005 11 023 Semple JW Da Silva LF Jervis EJ Ah Kee J Al Attar H Kummer L Heikkila JJ Pasero P Duncker BP An essential role for Orc6 in DNA replication through maintenance of pre replicative complexes EMBO J November 2006 25 21 5150 8 PMC 1630405 PMID 17053779 doi 10 1038 sj emboj 7601391 拓展閱讀 编辑Stephen P Bell and Anindya Dutta DNA REPLICATION IN EUKARYOTIC CELLS Annual Review of Biochemistry 2002 doi 10 1146 annurev biochem 71 110601 135425 A comprehensive review of molecular DNA replication 此条目包含有源于Pfam以及InterPro的属于公有领域的文本 IPR007220此条目包含有源于Pfam以及InterPro的属于公有领域的文本 IPR010748此条目包含有源于Pfam以及InterPro的属于公有领域的文本 IPR008721 取自 https zh wikipedia org w index php title 起始點識別複合物 amp oldid 69146983, 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