Design of Potent Inhibitors of Human RAD51 Recombinase Based on BRC Motifs of BRCA2 Protein: Modeling and Experimental Validation of a Chimera Peptide

• We have previously shown that a 28-amino acid peptide derived from the BRC4 motif of BRCA2 tumor suppressor inhibits selectively human RAD51 recombinase (HsRad51). With the aim of designing better inhibitors for cancer treatment, we combined an in silico docking approach with in vitro biochemical testing to construct a highly efficient chimera peptide from eight existing human BRC motifs. We built a molecular model of all BRC motifs complexed with HsRad51 based on the crystal structure of the BRC4 motif-HsRad51 complex, computed the interaction energy of each residue in each BRC motif, and selected the best amino acid residue at each binding position. This analysis enabled us to propose four amino acid substitutions in the BRC4 motif. Three of these increased the inhibitory effect in vitro, and this effect was found to be additive. We thus obtained a peptide that is about 10 times more efficient in inhibiting HsRad51-ssDNA complex formation than the original peptide.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Andra medicinska och farmaceutiska grundvetenskaper (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Other Basic Medicine (hsv//eng)

Nyckelord

Renodon-Corniere

Takahashi

Andrzej] Univ Lausanne

[Stasiak

cells

Vinh

Ctr

reca protein

Dept Chem

radiosensitivity

Tran

Fac Biol & Med

Stasiak

Dept Chem & Biosci

Alicja Z.

UMR 6204 U3B

Axelle

Sweden.

Bengt] Chalmers

repair protein

Masayuki]

breast-cancer

repeats

Kazuyasu] Hokkaido Univ

Julian

F-44322 Nantes 3

stranded-dna

[Asanomi

Fac Sci

[Nomme

isothermal titration calorimetry

homologous recombination

Sakaguchi

SE-41296 Gothenburg

RS

expression

[Norden

Yuya

France.

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)