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9  structures 1015  species 0  interactions 1166  sequences 30  architectures

Family: ORC2 (PF04084)

Summary: Origin recognition complex subunit 2

Pfam includes annotations and additional family information from a range of different sources. These sources can be accessed via the tabs below.

This is the Wikipedia entry entitled "ORC2". More...

ORC2 Edit Wikipedia article

ORC2
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases ORC2, ORC2L, origin recognition complex subunit 2
External IDs MGI: 1328306 HomoloGene: 4512 GeneCards: ORC2
Gene location (Human)
Chromosome 2 (human)
Chr. Chromosome 2 (human)[1]
Chromosome 2 (human)
Genomic location for ORC2
Genomic location for ORC2
Band 2q33.1 Start 200,908,973 bp[1]
End 200,963,680 bp[1]
RNA expression pattern
PBB GE ORC2L 204853 at fs.png
More reference expression data
Orthologs
Species Human Mouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_006190

NM_001025378
NM_001271526
NM_008765

RefSeq (protein)

NP_006181

NP_001020549
NP_001258455
NP_032791

Location (UCSC) Chr 2: 200.91 – 200.96 Mb Chr 1: 58.46 – 58.51 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse
Origin recognition complex subunit 2
Identifiers
Symbol ORC2
Pfam PF04084
InterPro IPR007220

Origin recognition complex subunit 2 is a protein that is encoded by the ORC2 (ORC2L) gene in humans.[5][6]

Function

The origin recognition complex (ORC) is a highly conserved six subunits 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. This protein forms a core complex with ORC3, ORC4, and ORC5. It also interacts with CDC45L and MCM10, which are proteins known to be important for the initiation of DNA replication. This protein has been demonstrated to specifically associate with the origin of replication of Epstein-Barr virus in human cells, and is thought to be required for DNA replication from viral origin of replication.[6]

Interactions

ORC2 has been shown to interact with:

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000115942 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000026037 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". 
  4. ^ "Mouse PubMed Reference:". 
  5. ^ Takahara K, Bong M, Brevard R, Eddy RL, Haley LL, Sait SJ, Shows TB, Hoffman GG, Greenspan DS (October 1996). "Mouse and human homologues of the yeast origin of replication recognition complex subunit ORC2 and chromosomal localization of the cognate human gene ORC2L". Genomics. 31 (1): 119–122. doi:10.1006/geno.1996.0018. PMID 8808289. 
  6. ^ a b "Entrez Gene: ORC2L origin recognition complex, subunit 2-like (yeast)". 
  7. ^ a b c d e f g h i j k l m Kneissl M, Pütter V, Szalay AA, Grummt F (March 2003). "Interaction and assembly of murine pre-replicative complex proteins in yeast and mouse cells". J. Mol. Biol. 327 (1): 111–28. doi:10.1016/s0022-2836(03)00079-2. PMID 12614612. 
  8. ^ Méndez J, Stillman B (November 2000). "Chromatin association of human origin recognition complex, cdc6, and minichromosome maintenance proteins during the cell cycle: assembly of prereplication complexes in late mitosis". Mol. Cell. Biol. 20 (22): 8602–12. doi:10.1128/mcb.20.22.8602-8612.2000. PMC 102165Freely accessible. PMID 11046155. 
  9. ^ Izumi M, Yanagi K, Mizuno T, Yokoi M, Kawasaki Y, Moon KY, Hurwitz J, Yatagai F, Hanaoka F (December 2000). "The human homolog of Saccharomyces cerevisiae Mcm10 interacts with replication factors and dissociates from nuclease-resistant nuclear structures in G(2) phase". Nucleic Acids Res. 28 (23): 4769–77. doi:10.1093/nar/28.23.4769. PMC 115166Freely accessible. PMID 11095689. 
  10. ^ Fujita M, Ishimi Y, Nakamura H, Kiyono T, Tsurumi T (March 2002). "Nuclear organization of DNA replication initiation proteins in mammalian cells". J. Biol. Chem. 277 (12): 10354–61. doi:10.1074/jbc.M111398200. PMID 11779870. 
  11. ^ a b c d e Vashee S, Simancek P, Challberg MD, Kelly TJ (July 2001). "Assembly of the human origin recognition complex". J. Biol. Chem. 276 (28): 26666–73. doi:10.1074/jbc.M102493200. PMID 11323433. 
  12. ^ Méndez J, Zou-Yang XH, Kim SY, Hidaka M, Tansey WP, Stillman B (March 2002). "Human origin recognition complex large subunit is degraded by ubiquitin-mediated proteolysis after initiation of DNA replication". Mol. Cell. 9 (3): 481–91. doi:10.1016/s1097-2765(02)00467-7. PMID 11931757. 
  13. ^ a b c Dhar SK, Delmolino L, Dutta A (August 2001). "Architecture of the human origin recognition complex". J. Biol. Chem. 276 (31): 29067–71. doi:10.1074/jbc.M103078200. PMID 11395502. 
  14. ^ Matsuoka S, Ballif BA, Smogorzewska A, McDonald ER, Hurov KE, Luo J, Bakalarski CE, Zhao Z, Solimini N, Lerenthal Y, Shiloh Y, Gygi SP, Elledge SJ (May 2007). "ATM and ATR substrate analysis reveals extensive protein networks responsive to DNA damage". Science. 316 (5828): 1160–6. doi:10.1126/science.1140321. PMID 17525332. 
  15. ^ Pinto S, Quintana DG, Smith P, Mihalek RM, Hou ZH, Boynton S, Jones CJ, Hendricks M, Velinzon K, Wohlschlegel JA, Austin RJ, Lane WS, 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. 23 (1): 45–54. doi:10.1016/s0896-6273(00)80752-7. PMID 10402192. 
  16. ^ Quintana DG, Hou Zh, Thome KC, Hendricks M, Saha P, Dutta A (November 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. 
  17. ^ Quintana DG, Thome KC, Hou Zh, Ligon AH, Morton CC, 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. 273 (42): 27137–45. doi:10.1074/jbc.273.42.27137. PMID 9765232. 

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
Identifiers
Symbol ORC2
Pfam PF04084
InterPro IPR007220
Origin recognition complex (ORC) subunit 3 N-terminus
Identifiers
Symbol ORC3_N
Pfam PF07034
InterPro IPR010748
Origin recognition complex subunit 6 (ORC6)
Identifiers
Symbol ORC6
Pfam PF05460
InterPro IPR008721

In molecular biology, origin recognition complex (ORC) 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.[1][2][3] ORC is a central component for eukaryotic DNA replication, and remains bound to chromatin at replication origins throughout the cell cycle.[4]

ORC directs DNA replication throughout the genome and is required for its initiation.[5][6][7] ORC bound at replication origins serves as the foundation for assembly of the pre-replication complex (pre-RC), which includes Cdc6, Tah11 (a.k.a. Cdt1), and the Mcm2-Mcm7 complex.[8][9][10] Pre-RC assembly during G1 is required for replication licensing of chromosomes prior to DNA synthesis during S phase.[11][12][13] 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.[4][14][15][16]

The ORC is present throughout the cell cycle bound to replication origins, but is only active in late mitosis and early G1.

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).[5][6][7] 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.[7][17][18]

Both Orc1 and Orc5 bind ATP, though only Orc1 has ATPase activity.[19] The binding of ATP by Orc1 is required for ORC binding to DNA and is essential for cell viability.[10] The ATPase activity of Orc1 is involved in formation of the pre-RC.[20][21][22] 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.[23] Interactions within ORC suggest that Orc2-3-6 may form a core complex.[4]

Proteins

This process was initiated by the loading of Mcm2-7 onto the chromatid by the ORC and associated proteins

The following proteins are present in the ORC:

Origin Recognition Complex Protein Subunits[24]
Species Name S. cerevisiae S. pombe D. melanogaster Vertebrates
ORC 1-6 ORC 1-6 ORC 1-6 ORC 1-6
Cdc6 Cdc18 Cdc6 Cdc6
Cdt1/Tah11/Sid2 Cdt1 DUP Cdt1/RLF-B
Mcm2 Mcm2/Cdc19/Nda1 Mcm2 Mcm2
Mcm3 Mcm3 Mcm3 Mcm3
Cdc54/Mcm4 Cdc21 DPA Mcm4
Cdc46/Mcm5 Mcm5/Nda4 Mcm5 Mcm5
Mcm6 Mcm6/Mis5 Mcm6 Mcm6
Cdc47/Mcm7 Mcm7 Mcm7 mcm7

Morgan Figure 4-9 pg. 65

Autonomously replicating sequences (ARS)

Budding yeast

Autonomously Replicating Sequences, first discovered in budding yeast, are integral to the success of the ORC. These 100-200bp sequences facilitate replication activity during S phase. ARSs can be placed at any novel location of the chromosomes of budding yeast and will facilitate replication from those sites. A highly conserved sequence of 11bp (known as the A element) is thought to be essential for origin function in budding yeast.[24] The ORC was originally identified by its ability to bind to the A element of the ARS in budding yeast.

Animals

Animal cells contain a much more cryptic version of an ARS, with no conserved sequences found as of yet. However, in animal cells, replication origins gather into bundles called replicon clusters. Each cluster's replicons are similar in length, but individual clusters have replicons of varying length. These replicons all have similar basic residues to which the ORC binds, which in many ways mimic the conserved 11bp A element. All of these clusters are simultaneously activated during S phase.[24]

Role in pre-RC assembly

The ORC is essential for the loading of MCM complexes (Pre-RC) onto DNA. This process is dependant on the ORC, Cdc6, and Cdt1 – involving several ATP controlled recruiting events. First, the ORC and Cdc6 form a complex on origin DNA (marked by ARS type regions). New ORC/Cdc6 complexes then recruit Cdt1/Mcm2-7 molecules to the site. Once this massive ORC/Cdc6/Cdt1/Mcm2-7 complex is formed, the ORC/Cdc6/Cdt1 molecules work together to load Mcm2-7 onto the DNA itself by hydrolysis of ATP by Cdc6. Cdc6's phosphorylative activity is dependant on both the ORC and origin DNA. This leads to Cdt1 having decreased stability on the DNA and falling off of the complex leading to Mcm2-7 loading on to the DNA.[25][24][26][27]

CDC6 Function.jpgEukPreRC.jpg

Origin binding activity

Although the ORC is composed of six discrete subunits, only one of these has been found to be significant - ORC1. In vivo studies have shown that Lys-263 and Arg-367 are the basic residues responsible for faithful ORC loading. These molecules represent the above mentioned ARS.[28] ORC1 interacts with ATP and these basic residues in order to bind the ORC to origin DNA. It has been established that this occurs far before replication, and that the ORC itself is already bound to Origin DNA by the time any Mcm2-7 loading occurs.[27] When Mcm2-7 is first loaded it completely encircles the DNA and helicase activity is inhibited. In S phase, the Mcm2-7 complex interacts with helicase cofactors Cdc45 and GINS to isolate a single DNA strand, unwind the origin, and begin replication down the chromosome. In order to have bidirectional replication, this process happens twice at an origin. Both loading events are mediated by one ORC via an identical process as the first.[29]

See also

References

  1. ^ Origin Recognition Complex at the US National Library of Medicine Medical Subject Headings (MeSH)
  2. ^ 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. 
  3. ^ 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. 
  4. ^ 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. 
  5. ^ 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. 
  6. ^ 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. 
  7. ^ 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. 
  8. ^ 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 42456Freely accessible. PMID 7892251. 
  9. ^ 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 398377Freely accessible. PMID 7781615. 
  10. ^ 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 2952294Freely accessible. PMID 16228006. 
  11. ^ 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. 
  12. ^ 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. 
  13. ^ 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. 
  14. ^ 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 58709Freely accessible. PMID 11572976. 
  15. ^ 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. 
  16. ^ 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 1190345Freely accessible. PMID 16024805. 
  17. ^ 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. 
  18. ^ 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. 
  19. ^ 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. 
  20. ^ 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 37444Freely accessible. PMID 11459976. 
  21. ^ 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. 
  22. ^ 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. 
  23. ^ 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 1630405Freely accessible. PMID 17053779. 
  24. ^ a b c d Morgan, David (2007). The Cell Cycle: Principles of Control. Primers in Biology. pp. 62–75. ISBN 978-0878935086. 
  25. ^ Fernández-Cid, Alejandra (Winter 2017). "An ORC/Cdc6/MCM2-7 Complex Is Formed in a Multistep Reaction to Serve as a Platform for MCM Double-Hexamer Assembly". Molecular Cell. 50: 577–588. doi:10.1016/j.molcel.2013.03.026 – via Science Direct. 
  26. ^ Randell, John (Winter 2017). "Sequential ATP Hydrolysis by Cdc6 and ORC Directs Loading of the Mcm2-7 Helicase". Molecular Cell. 21: 29–39. doi:10.1016/j.molcel.2005.11.023. PMID 16387651 – via Elsevier Science Direct. 
  27. ^ a b Speck, Christian (Winter 2017). "ATPase-dependent cooperative binding of ORC and Cdc6 to origin DNA". Nature Structural & Molecular Biology. 12: 965–971. doi:10.1038/nsmb1002. PMC 2952294Freely accessible. PMID 16228006 – via Nature.com. 
  28. ^ Kawakami, Hironori (Winter 2017). "Specific binding of eukaryotic ORC to DNA replication origins depends on highly conserved basic residues". Scientific Reports. 5. doi:10.1038/srep14929 – via Nature Research. 
  29. ^ Chistol, Gheorghe (Winter 2017). "Single-Molecule Visualization of MCM2-7 DNA Loading: Seeing Is Believing". Cell. 161: 429–430. doi:10.1016/j.cell.2015.04.006 – via Elsevier Science Direct. 

Further reading

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 subunit 2 Provide feedback

All DNA replication initiation is driven by a single conserved eukaryotic initiator complex termed he origin recognition complex (ORC). The ORC is a six protein complex. The function of ORC is reviewed in [1].

Literature references

  1. Bell SP; , Genes Dev 2002;16:659-672.: The origin recognition complex: from simple origins to complex functions. PUBMED:11914271 EPMC:11914271


This tab holds annotation information from the InterPro database.

InterPro entry IPR007220

The Origin Recognition Complex (ORC) is a six-subunit ATP-dependent DNA-binding complex encoded in yeast by ORC1-6 [PUBMED:17241905]. ORC is a central component for eukaryotic DNA replication, and binds chromatin at replication origins throughout the cell cycle [PUBMED:17825065]. ORC directs DNA replication throughout the genome and is required for its initiation [PUBMED:1579162, PUBMED:7585959, PUBMED:16716188]. ORC bound at replication origins serves as the foundation for assembly of the pre-replicative complex (pre-RC), which includes Cdc6, Tah11 (aka Cdt1), and the Mcm2-7 complex [PUBMED:7892251, PUBMED:7781615, PUBMED:16228006]. Pre-RC assembly during G1 is required for replication licensing of chromosomes prior to DNA synthesis during S phase [PUBMED:10966477, PUBMED:12045100, PUBMED:15680967]. 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 [PUBMED:17825065, PUBMED:11572976, PUBMED:11429609, PUBMED:16024805].

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) [PUBMED:1579162, PUBMED:7585959, PUBMED:16716188]. 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 [PUBMED:16716188, PUBMED:8622770, PUBMED:9171055].

Both ORC1 and ORC5 bind ATP, although only ORC1 has ATPase activity [PUBMED:9038340]. The binding of ATP by ORC1 is required for ORC binding to DNA and is essential for cell viability [PUBMED:16228006]. The ATPase activity of ORC1 is involved in formation of the pre-RC [PUBMED:11459976, PUBMED:15610739, PUBMED:16387651]. 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 [PUBMED:17053779]. Interactions within ORC suggest that ORC2-3-6 may form a core complex [PUBMED:17825065].

ORC homologues have been found in various eukaryotes, including fission yeast, insects, amphibians, and humans [PUBMED:9442876].

This entry represents subunit 2, which binds the origin of replication. It plays a role in chromosome replication and mating type transcriptional silencing.

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Seed source: Pfam-B_7065 (release 7.3);
Previous IDs: none
Type: Family
Sequence Ontology: SO:0100021
Author: Wood V , Finn RD
Number in seed: 140
Number in full: 1166
Average length of the domain: 301.10 aa
Average identity of full alignment: 29 %
Average coverage of the sequence by the domain: 60.44 %

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search method: hmmsearch -Z 45638612 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 24.6 24.6
Trusted cut-off 24.7 24.7
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Model length: 332
Family (HMM) version: 14
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Viruses Viruses Unclassified Unclassified
Viroids Viroids Unclassified sequence Unclassified sequence

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This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the adjacent tab. More...

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The tree shows the occurrence of this domain across different species. More...

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Structures

For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the ORC2 domain has been found. There are 9 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein sequence.

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