Open AccessExploiting the P-1 Pocket of BRCT Domains Toward a Structure Guided Inhibitor Design
Author(s) -
Zhengrong Yuan,
Eric A. Kumar,
Stephen J. Campbell,
Nicholas Y. Palermo,
Smitha Kizhake,
J. N. Mark Glover,
Amarnath Natarajan
Publication year - 2011
Publication title -
acs medicinal chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.065
H-Index - 66
ISSN - 1948-5875
DOI - 10.1021/ml200147a
Subject(s) - protein–protein interaction , peptide , dna repair , dna , protein structure , computational biology , chemistry , microbiology and biotechnology , biology , biochemistry
Breast cancer gene 1 carboxy terminus (BRCT) domains are found in a number of proteins that are important for DNA damage response (DDR). The BRCT domains bind phosphorylated proteins and these protein-protein interactions are essential for DDR and DNA repair. High affinity domain specific inhibitors are needed to facilitate the dissection of the protein-protein interactions in the DDR signaling. The BRCT domains of BRCA1 bind phosphorylated protein through a pSXXF consensus recognition motif. We identified a hydrophobic pocket at the P-1 position of the pSXXF binding site. Here we conducted a structure-guided synthesis of peptide analogs with hydrophobic functional groups at the P-1 position. Evaluation of these led to the identification of a peptide mimic 15 with a inhibitory constant (K(i)) of 40 nM for BRCT(BRCA1). Analysis of the TopBP1 and MDC1 BRCT domains suggests a similar approach is viable to design high affinity inhibitors.