This family of proteins includes BRCA2 and CDKN1A-interacting protein (BCCIP) and BCP1. In fungi, BCP1 is involved in nuclear export, actin cytoskeleton organisation and vesicular transport [1]. Its homologue in human and mouse, BCCIP, may promote cell cycle arrest by enhancing the inhibition of CDK2 activity by CDKN1A/p21 and may be required for repair of DNA damage by homologous recombination in conjunction with BRCA2 [2,3,4,5,6].

1: Regulation of PI4,5P2 synthesis by nuclear-cytoplasmic shuttling of the Mss4 lipid kinase. Audhya A, Emr SD; EMBO J. 2003;22:4223-4236. PMID:12912920

2: TOK-1, a novel p21Cip1-binding protein that cooperatively enhances p21-dependent inhibitory activity toward CDK2 kinase. Ono T, Kitaura H, Ugai H, Murata T, Yokoyama KK, Iguchi-Ariga SM, Ariga H; J Biol Chem. 2000;275:31145-31154. PMID:10878006

3: Genomic structure of the human BCCIP gene and its expression in cancer. Meng X, Liu J, Shen Z; Gene. 2003;302:139-146. PMID:12527204

4: BCCIP regulates homologous recombination by distinct domains and suppresses spontaneous DNA damage. Lu H, Yue J, Meng X, Nickoloff JA, Shen Z; Nucleic Acids Res. 2007;35:7160-7170. PMID:17947333

5: The BRCA2-interacting protein BCCIP functions in RAD51 and BRCA2 focus formation and homologous recombinational repair. Lu H, Guo X, Meng X, Liu J, Allen C, Wray J, Nickoloff JA, Shen Z; Mol Cell Biol. 2005;25:1949-1957. PMID:15713648

6: LYRIC/AEG-1 overexpression modulates BCCIPalpha protein levels in prostate tumor cells. Ash SC, Yang DQ, Britt DE; Biochem Biophys Res Commun. 2008;371:333-338. PMID:18440304