title: Synthesis and structure-activity relationships of linear and conformationally constrained peptide analogues of CIYKYY as Src tyrosine kinase inhibitors.
abstract: A series of peptide analogues of Ac-CIYKYY (1) were synthesized by functional group modifications in peptide side chains or by introducing conformational constraints, to improve the inhibitory potency against active Src kinase. Ac-CIYKF(4-NO2)Y (2, IC50 = 0.53 microM) and conformationally constrained peptide 31 (IC50 = 0.28 microM) exhibited 750- and 1400-fold higher inhibitory activities, respectively, versus that of 1 (IC50 = 400 microM). Compound 2 exhibited a partial competitive inhibition pattern against ATP.
authors.affiliation: Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island 02881, USA.
authors.forename: Anil
authors.initials: A
authors.lastname: Kumar
authors.forename: Guofeng
authors.initials: G
authors.lastname: Ye
authors.forename: Yuehao
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Lin
authors.forename: Gongqin
authors.initials: G
authors.lastname: Sun
authors.forename: Keykavous
authors.initials: K
authors.lastname: Parang
mesh_terms: D000255:Adenosine Triphosphate / Q000037:antagonists & inhibitors / Q000737:chemistry; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000737:chemistry; D011487:Protein Conformation; D016392:Proto-Oncogene Proteins pp60(c-src) / Q000037:antagonists & inhibitors / Q000737:chemistry; D013329:Structure-Activity Relationship; D019061:src-Family Kinases / Q000037:antagonists & inhibitors*
chemical_list: D009842:Oligopeptides; D000255:Adenosine Triphosphate; D016392:Proto-Oncogene Proteins pp60(c-src); D019061:src-Family Kinases