BRCA1 forms a heterodimer with BARD1

Stable Identifier
Reaction [binding]
Homo sapiens
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BRCA1 and BARD1 form a stable heterodimer through an interaction between sequences encompassing their N-terminal RING domains (Wu et al. 1996, Brzovic et al. 2001). In addition to the RING domains, BRCA1 and BARD1 both have tandem BRCT motifs at their C termini. The central region of BARD1 contains ankyrin repeats (Wu et al. 1996). Formation of BRCA1:BARD1 heterodimers is necessary for the repair of double-strand DNA breaks by homologous recombination (Westermark et al. 2003, Laufer et al. 2007), BRCA1-mediated tumor suppression (Shakya et al. 2008) and normal development (McCarthy et al. 2003). Tumorigenic BRCA1 mutations that abolish the formation of BRCA1:BARD1 heterodimers have been reported (Wu et al. 1996, Brzovic et al. 2001).
Literature References
PubMed ID Title Journal Year
18443292 The basal-like mammary carcinomas induced by Brca1 or Bard1 inactivation implicate the BRCA1/BARD1 heterodimer in tumor suppression

Szabolcs, M, Baer, RJ, Ludwig, T, Shakya, R, Basso, K, Ospina, E, Nandula, S, Murty, V, McCarthy, E

Proc. Natl. Acad. Sci. U.S.A. 2008
17848578 Structural requirements for the BARD1 tumor suppressor in chromosomal stability and homology-directed DNA repair

Murty, VV, Nandula, SV, Baer, RJ, Jasin, M, Ludwig, T, Modi, AP, Laufer, M, Wang, S

J. Biol. Chem. 2007
11573085 Structure of a BRCA1-BARD1 heterodimeric RING-RING complex

King, MC, Hoyt, DW, Rajagopal, P, Brzovic, PS, Klevit, RE

Nat. Struct. Biol. 2001
8944023 Identification of a RING protein that can interact in vivo with the BRCA1 gene product

Phung, A, Bowcock, AM, Wu, LC, Hwang, LY, Wang, ZW, Baer, R, Yang, MC, Spillman, MA, Xu, XL, Tsan, JT

Nat. Genet. 1996
14560035 BARD1 participates with BRCA1 in homology-directed repair of chromosome breaks

Baer, RJ, Jasin, M, Moynahan, ME, Westermark, UK, Olshen, AB, Reyngold, M

Mol. Cell. Biol. 2003
12832489 Loss of Bard1, the heterodimeric partner of the Brca1 tumor suppressor, results in early embryonic lethality and chromosomal instability

McCarthy, EE, Baer, RJ, Ludwig, T, Celebi, JT

Mol. Cell. Biol. 2003
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