Structural maintenance of chromosomes protein 1A - Q14683 (SMC1A_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

 
Function
Involved in chromosome cohesion during cell cycle and in DNA repair. Central component of cohesin complex. The cohesin complex is required for the cohesion of sister chromatids after DNA replication. The cohesin complex apparently forms a large proteinaceous ring within which sister chromatids can be trapped. At anaphase, the complex is cleaved and dissociates from chromatin, allowing sister chromatids to segregate. The cohesin complex may also play a role in spindle pole assembly during mitosis. Involved in DNA repair via its interaction with BRCA1 and its related phosphorylation by ATM, or via its phosphorylation by ATR. Works as a downstream effector both in the ATM/NBS1 branch and in the ATR/MSH2 branch of S-phase checkpoint. UniProt
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Subunit Structure
Forms a heterodimer with SMC3 in cohesin complexes (PubMed:22628566). Cohesin complexes are composed of the SMC1 (SMC1A or SMC1B) and SMC3 heterodimer attached via their SMC hinge domain, RAD21 which link them, and one STAG protein (STAG1, STAG2 or STAG3), which interacts with RAD21 (PubMed:11076961). In germ cell cohesin complexes, SMC1A is mutually exclusive with SMC1B (By similarity). Interacts with BRCA1 (PubMed:11877377). Found in a complex with CDCA5, SMC3 and RAD21, PDS5A/SCC-112 and PDS5B/APRIN (PubMed:15837422). Interacts with NDC80 (PubMed:9295362, PubMed:10409732,). Interacts with BRAT1 (PubMed:22977523). Found in a complex containing POLE and SMC3. Interacts with RPGR, STAG3 and SYCP2 (By similarity). Found in a cohesin complex with SMC3, STAG1 and RAD21 (PubMed:22628566). The SMC1A-SMC3 heterodimer interacts with the NIPBL-MAU2 heterodimer (PubMed:22628566). UniProt
Domain
The flexible SMC hinge domain, which separates the large intramolecular coiled coil regions, allows the heterotypic interaction with the corresponding domain of SMC3, forming a V-shaped heterodimer. The two heads of the heterodimer are then connected by different ends of the cleavable RAD21 protein, forming a ring structure. UniProt
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Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
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Data in blue originates from PDB
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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