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0  structures 258  species 0  interactions 326  sequences 17  architectures

Family: ORC4_C (PF14629)

Summary: Origin recognition complex (ORC) subunit 4 C-terminus

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This is the Wikipedia entry entitled "ORC4". More...

ORC4 Edit Wikipedia article

Origin recognition complex, subunit 4
Symbols ORC4; ORC4L; ORC4P
External IDs OMIM603056 MGI1347043 HomoloGene8059 GeneCards: ORC4 Gene
RNA expression pattern
PBB GE ORC4L 203351 s at tn.png
PBB GE ORC4L 203352 at tn.png
More reference expression data
Species Human Mouse
Entrez 5000 26428
Ensembl ENSG00000115947 ENSMUSG00000026761
UniProt O43929 O88708
RefSeq (mRNA) NM_001190879.2 NM_001177313.1
RefSeq (protein) NP_001177808.1 NP_001170784.1
Location (UCSC) Chr 2:
148.69 – 148.78 Mb
Chr 2:
48.76 – 48.81 Mb
PubMed search [1] [2]

Origin recognition complex subunit 4 is a protein that in humans is encoded by the ORC4 (ORC4L) gene.[1][2][3]

The origin recognition complex (ORC) is a highly conserved six subunit protein complex essential for the initiation of the DNA replication in eukaryotic cells. Studies in yeast demonstrated that ORC binds specifically to origins of replication and serves as a platform for the assembly of additional initiation factors such as Cdc6 and Mcm proteins. The protein encoded by this gene is a subunit of the ORC complex. It has been shown to form a core complex with ORC2L, -3L, and -5L. Three alternatively spliced transcript variants encoding the same protein have been reported.[3]

[edit] Interactions

ORC4 has been shown to interact with ORC1,[4] MCM6,[4] ORC2,[1][4][5][6] ORC5,[4][5][7] ORC3,[5][6][8] MCM2,[4] MCM4,[4] MCM3[4] and ORC6.[4]

[edit] References

  1. ^ a b Quintana DG, Hou Zh, Thome KC, Hendricks M, Saha P, Dutta A (December 1997). "Identification of HsORC4, a member of the human origin of replication recognition complex". J Biol Chem 272 (45): 28247–51. DOI:10.1074/jbc.272.45.28247. PMID 9353276. 
  2. ^ Eki T, Dean FB, Kohda A, Okumura K, Abe M, Murakami Y, Ishiai M, Satomoto K, Hurwitz J, O'Donnell M, Hanaoka F (October 1998). "Assignment of the homologue of the yeast origin recognition complex subunit ORC4 (ORC4L) to human chromosome band 2q22→q23 by in situ hybridization and somatic cell hybrid analysis". Cytogenet Cell Genet 81 (1): 89–90. DOI:10.1159/000014997. PMID 9691185. 
  3. ^ a b "Entrez Gene: ORC4L origin recognition complex, subunit 4-like (yeast)". 
  4. ^ a b c d e f g h Kneissl, Margot; Pütter Vera, Szalay Aladar A, Grummt Friedrich (March 2003). "Interaction and assembly of murine pre-replicative complex proteins in yeast and mouse cells". J. Mol. Biol. (England) 327 (1): 111–28. DOI:10.1016/S0022-2836(03)00079-2. ISSN 0022-2836. PMID 12614612. 
  5. ^ a b c Dhar, S K; Delmolino L, Dutta A (August 2001). "Architecture of the human origin recognition complex". J. Biol. Chem. (United States) 276 (31): 29067–71. DOI:10.1074/jbc.M103078200. ISSN 0021-9258. PMID 11395502. 
  6. ^ a b Vashee, S; Simancek P, Challberg M D, Kelly T J (July 2001). "Assembly of the human origin recognition complex". J. Biol. Chem. (United States) 276 (28): 26666–73. DOI:10.1074/jbc.M102493200. ISSN 0021-9258. PMID 11323433. 
  7. ^ Quintana, D G; Thome K C, Hou Z H, Ligon A H, Morton C C, Dutta A (October 1998). "ORC5L, a new member of the human origin recognition complex, is deleted in uterine leiomyomas and malignant myeloid diseases". J. Biol. Chem. (UNITED STATES) 273 (42): 27137–45. DOI:10.1074/jbc.273.42.27137. ISSN 0021-9258. PMID 9765232. 
  8. ^ Pinto, S; Quintana D G, Smith P, Mihalek R M, Hou Z H, Boynton S, Jones C J, Hendricks M, Velinzon K, Wohlschlegel J A, Austin R J, Lane W S, Tully T, Dutta A (May 1999). "latheo encodes a subunit of the origin recognition complex and disrupts neuronal proliferation and adult olfactory memory when mutant". Neuron (UNITED STATES) 23 (1): 45–54. DOI:10.1016/S0896-6273(00)80752-7. ISSN 0896-6273. PMID 10402192. 

[edit] Further reading

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This is the Wikipedia entry entitled "Origin recognition complex". More...

Origin recognition complex Edit Wikipedia article

Origin recognition complex subunit 2
Symbol ORC2
Pfam PF04084
InterPro IPR007220
Origin recognition complex (ORC) subunit 3 N-terminus
Symbol ORC3_N
Pfam PF07034
InterPro IPR010748
Origin recognition complex subunit 6 (ORC6)
Symbol ORC6
Pfam PF05460
InterPro IPR008721
Potential role of Cdc6 at the initiation of DNA replication.[1]

In molecular biology, ORC or origin recognition complex is a multi-subunit DNA binding complex (6 subunits) that binds in all eukaryotes in an ATP-dependent manner to origins of replication. The subunits of this complex are encoded by the ORC1, ORC2, ORC3, ORC4, ORC5 and ORC6 genes.[2][3][4] ORC is a central component for eukaryotic DNA replication, and binds chromatin at replication origins throughout the cell cycle.[5] ORC directs DNA replication throughout the genome and is required for its initiation.[6][7][8] ORC bound at replication origins serves as the foundation for assembly of the pre-replication complex (pre-RC), which includes Cdc6, Tah11 (aka Cdt1), and the Mcm2-Mcm7 complex.[9][10][11] Pre-RC assembly during G1 is required for replication licensing of chromosomes prior to DNA synthesis during S phase.[12][13][14] Cell cycle-regulated phosphorylation of Orc2, Orc6, Cdc6, and MCM by the cyclin-dependent protein kinase Cdc28 regulates initiation of DNA replication, including blocking reinitiation in G2/M phase.[5][15][16][17]

In yeast, ORC also plays a role in the establishment of silencing at the mating-type loci Hidden MAT Left (HML) and Hidden MAT Right (HMR).[6][7][8] ORC participates in the assembly of transcriptionally silent chromatin at HML and HMR by recruiting the Sir1 silencing protein to the HML and HMR silencers.[8][18][19]

Both Orc1 and Orc5 bind ATP, though only Orc1 has ATPase activity.[20] The binding of ATP by Orc1 is required for ORC binding to DNA and is essential for cell viability.[11] The ATPase activity of Orc1 is involved in formation of the pre-RC.[21][22][23] ATP binding by Orc5 is crucial for the stability of ORC as a whole. Only the Orc1-5 subunits are required for origin binding; Orc6 is essential for maintenance of pre-RCs once formed.[24] Interactions within ORC suggest that Orc2-3-6 may form a core complex.[5]


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

Further reading[edit]

This article incorporates text from the public domain Pfam and InterPro IPR007220

This article incorporates text from the public domain Pfam and InterPro IPR010748

This article incorporates text from the public domain Pfam and InterPro IPR008721

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.

Origin recognition complex (ORC) subunit 4 C-terminus Provide feedback

This entry represents the C-terminus of origin recognition complex subunit 4 [1,2].

Literature references

  1. Quintana DG, Hou Zh, Thome KC, Hendricks M, Saha P, Dutta A;, J Biol Chem. 1997;272:28247-28251.: Identification of HsORC4, a member of the human origin of replication recognition complex. PUBMED:9353276 EPMC:9353276

  2. Chuang RY, Kelly TJ;, Proc Natl Acad Sci U S A. 1999;96:2656-2661.: The fission yeast homologue of Orc4p binds to replication origin DNA via multiple AT-hooks. PUBMED:10077566 EPMC:10077566

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Seed source: Jackhmmer:O43929
Previous IDs: none
Type: Family
Author: Eberhardt R
Number in seed: 87
Number in full: 326
Average length of the domain: 202.70 aa
Average identity of full alignment: 22 %
Average coverage of the sequence by the domain: 39.47 %

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search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 25.3 25.3
Trusted cut-off 26.1 27.4
Noise cut-off 24.5 25.2
Model length: 203
Family (HMM) version: 1
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