ABRAXAS1
Function
Involved in DNA damage response and double-strand break (DSB) repair. Component of the BRCA1-A complex, acting as a central scaffold protein that assembles the various components of the complex and mediates the recruitment of BRCA1. The BRCA1-A complex specifically recognizes 'Lys-63'-linked ubiquitinated histones H2A and H2AX at DNA lesion sites, leading to target the BRCA1-BARD1 heterodimer to sites of DNA damage at DSBs. This complex also possesses deubiquitinase activity that specifically removes 'Lys-63'-linked ubiquitin on histones H2A and H2AX.
Involvement in disease
Breast cancer
BC
A common malignancy originating from breast epithelial tissue. Breast neoplasms can be distinguished by their histologic pattern. Invasive ductal carcinoma is by far the most common type. Breast cancer is etiologically and genetically heterogeneous. Important genetic factors have been indicated by familial occurrence and bilateral involvement. Mutations at more than one locus can be involved in different families or even in the same case.
None
Disease susceptibility is associated with variants affecting the gene represented in this entry.
Post-translational modifications
Phosphorylation of Ser-406 of the pSXXF motif by ATM or ATR constitutes a specific recognition motif for the BRCT domain of BRCA1 (PubMed:17525340, PubMed:17643121, PubMed:17643122). Ionizing radiation promotes rapid phosphorylation at Ser-404 and Ser-406 by ATM; this promotes recruitment of BRCA1 to sites of DNA damage (PubMed:26778126).
Sequence Similarities
Belongs to the FAM175 family. Abraxas subfamily.
Cellular localization
- Nucleus
- Localizes at sites of DNA damage at double-strand breaks (DSBs).
Alternative names
ABRA1, CCDC98, FAM175A, UNQ496/PRO1013, ABRAXAS1, BRCA1-A complex subunit Abraxas 1, Coiled-coil domain-containing protein 98, Protein FAM175A