Structural and Conformational Requirements for High-Affinity Binding to the SH2 Domain of Grb2
摘要:
Following earlier work on cystine-bridged peptides, cyclic phosphopeptides containing nonreducible mimics of cystine were synthesized that show high affinity and specificity toward the Src homology (SH2) domain of the growth factor receptor-binding protein (Grb2). Replacement of the cystine in the cyclic heptapeptide cyclo(CY*VNVPC) by D-alpha-acetylthialysine or D-alpha-lysine gave cyclo(Y*VNVP(D-alpha-acetyl-thiaK)) (22) and cyclo(Y*VNVP(D-alpha-acetyl-K)) (30), which showed improved binding 10-fold relative to that of the control peptide KPFY*VNVEF (1). NMR spectroscopy and molecular modeling experiments indicate that a beta-turn conformation centered around Y*VNV is essential for high-affinity binding. X-ray structure analyses show that the linear peptide 1 and the cyclic compound 21 adopt a similar binding mode with a beta-turn conformation. Our data confirm the unique structural requirements of the ligand binding site of the SH2 domain of Grb2. Moreover, the potency of our cyclic lactams can be explained by the stabilization of the beta-turn conformation by three intramolecular hydrogen bonds (one mediated by an H2O molecule). These stable and easily accessible cyclic peptides can serve as templates for the evaluation of phosphotyrosine surrogates and further chemical elaboration.
[EN] METHOD FOR MODIFICATION OF ORGANIC MOLECULES<br/>[FR] PROCÉDÉ DE MODIFICATION DE MOLÉCULES ORGANIQUES
申请人:UNIV NANYANG TECH
公开号:WO2012158122A1
公开(公告)日:2012-11-22
The present invention is directed to a method of alkylating a thiol group (R-S-H) or seleno group (R-Se-H) in a target molecule wherein the method comprises: reacting a target molecule comprising at least one thiol group with a compound of formula (I) or (II): wherein R is an acetyl group or any other acyl group or is a group comprising any one of: or wherein R in formula (II) can also be an alkyl group; and wherein R' is selected from a group consisting of a hydrogen, a methyl group and an ethyl group.
Following earlier work on cystine-bridged peptides, cyclic phosphopeptides containing nonreducible mimics of cystine were synthesized that show high affinity and specificity toward the Src homology (SH2) domain of the growth factor receptor-binding protein (Grb2). Replacement of the cystine in the cyclic heptapeptide cyclo(CY*VNVPC) by D-alpha-acetylthialysine or D-alpha-lysine gave cyclo(Y*VNVP(D-alpha-acetyl-thiaK)) (22) and cyclo(Y*VNVP(D-alpha-acetyl-K)) (30), which showed improved binding 10-fold relative to that of the control peptide KPFY*VNVEF (1). NMR spectroscopy and molecular modeling experiments indicate that a beta-turn conformation centered around Y*VNV is essential for high-affinity binding. X-ray structure analyses show that the linear peptide 1 and the cyclic compound 21 adopt a similar binding mode with a beta-turn conformation. Our data confirm the unique structural requirements of the ligand binding site of the SH2 domain of Grb2. Moreover, the potency of our cyclic lactams can be explained by the stabilization of the beta-turn conformation by three intramolecular hydrogen bonds (one mediated by an H2O molecule). These stable and easily accessible cyclic peptides can serve as templates for the evaluation of phosphotyrosine surrogates and further chemical elaboration.