Role of MERIT40 in stabilization of BRCA1 complex: a protein-protein interaction study

Biochem Biophys Res Commun. 2014 Apr 18;446(4):1139-44. doi: 10.1016/j.bbrc.2014.03.073. Epub 2014 Mar 22.


MERIT40 is a novel associate of the BRCA1-complex, thus play an essential role in DNA damage repair mechanism. It is the least implicit protein and its structural and functional aspects of regulating the stability of BRCA1-MERIT40 complex remain equivocal. Analysis of protein-protein interactions between BRCA1 and its cellular binding partners like ABRAXAS, RAP80 and MERIT40 would help to understand the role of protein complex integrity in DNA repair mechanism. The recombinant proteins were purified and their structural aspects were elucidated by spectroscopic methods. Interaction analysis was carried out to determine binding partners of MERIT40. MERIT40 showed interaction with bridging molecule, called ABRAXAS, thus generate a scaffold among various members which further stabilizes the entire complex. It acts as an adapter molecule by interacting with BRCA1-BRCT in non-phosphorylation dependent manner. The feature enlighten on structural and interaction profile of BRCA1-complex member to elucidate their role in complex stability and DNA repair process.

Keywords: BRCA1-complex stability; DNA damage response (DDR); MERIT40; RAP80.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing / chemistry
  • Adaptor Proteins, Signal Transducing / metabolism*
  • BRCA1 Protein / chemistry
  • BRCA1 Protein / metabolism*
  • Carrier Proteins / chemistry
  • Carrier Proteins / metabolism
  • DNA Repair
  • DNA-Binding Proteins
  • Histone Chaperones
  • Humans
  • Nuclear Proteins / metabolism
  • Protein Interaction Maps*


  • ABRAXAS1 protein, human
  • Adaptor Proteins, Signal Transducing
  • BABAM1 protein, human
  • BRCA1 Protein
  • Carrier Proteins
  • DNA-Binding Proteins
  • Histone Chaperones
  • Nuclear Proteins
  • UIMC1 protein, human