Synthesis, conformation and PKC isozyme surrogate binding of new lactone analogues of benzolactam-V8s
作者:Yu Nakagawa、Kazuhiro Irie、Akiko Masuda、Hajime Ohigashi
DOI:10.1016/s0040-4020(02)00099-6
日期:2002.3
To investigate the role of the amide hydrogen of benzolactam-V8s (1-3) on protein kinase C (PKC) isozyme binding, new lactone analogues of benzolactam-V8s with hydrophobic side chains at positions 8 and/or 9 (5-8) were synthesized. The PKC binding affinities of 8- and 9-decylbenzolactone-V8 (5,6) were much lower than those of 8- and 9-decylbenzolactam-V8 (2,3), respectively, indicating that the amide hydrogen of benzolactam-V8s plays a critical role in PKC binding. 8-Decylbenzolactam-V8 (2) showed lower binding affinities to all PKC isozymes compared with those of 9-decylbenzolactam-V8 (3). The binding affinities of 8-substituted benzolactones (5,7,8) were also lower than those of 9-decylbenzolactone-V8 (6), but their PKC isozyme selectivity was higher than those of 2, 3 and 6. 8-Decybenzolactone-V8 (5) exhibited the most significant eta-C1B selectivity among the four benzolactones (5-8) synthesized in this study. (C) 2002 Elsevier Science Ltd. All rights reserved.