BAP1 (D1W9B) Rabbit mAb #13187

BRCA1-Associated Protein 1 (BAP1) was originally identified as a BRCA1 associated, nuclear localized ubiquitin hydrolase that suppresses cell growth (1). The protein belongs to the UCH family of deubiquitinases, with a UCH domain in its amino-terminal segment and a BRCA1 interaction domain as well as a nuclear localization signal in its carboxy-terminal segment (1). Frequent gene locus rearrangement, deletion, and null mutation of BAP1 have been found in lung and breast cancers (1,2). In vivo mutation analysis of cancer cell line survival and animal tumorigenesis indicates that both the deubiquitinase activity and the nuclear localization signal are required for BAP1 function as a tumor suppressor (3). BAP1 does not have direct deubiquitination activity towards the autoubiquitinated BRCA1/BARD1 E3 complex (4), but its interaction with BARD1 inhibits BRCA1/BARD1 E3 activity by interfering with the complex dimerization process (5). In addition to its interaction with BRCA1/BARD1, BAP1 has also been shown to interact with and deubiquitinate HCF-1, thereby controlling its stability (6).