Synthesis and biological evaluation of modified pentapeptides as potent proteinase K inhibitors
作者:Anilkumar R. Kore、Muthian Shanmugasundaram、Irudaya Charles、Quoc Hoang
DOI:10.1016/j.bmcl.2010.03.072
日期:2010.5
This communication reports the first demonstration of synthesis and biological validation of modified pentapeptides, such as methoxysuccinyl-Ala-Ala-Ala-Pro-Leu-chloromethyl ketone 6b as a potent proteinase K inhibitor. The efficacy of MeOSuc-AAAPL-CH(2)Cl 6b analog in inhibiting the proteolytic activity of proteinase K was compared with the known MeOSuc-AAPV-CH(2)Cl analog. The examination of inhibitory activity using RT-PCR assay in the presence of proteinase K revealed that the MeOSuc-AAAPL-CH(2)Cl 6b inhibitor at a concentration of 0.05 mM allows a signal to be obtained for an exogenous target ('Xeno RNA') at 30 cycles (i.e., Ct = 30), whereas the control MeOSuc-AAPV-CH(2)Cl requires a fivefold higher concentration (0.25 mM) to produce the same Ct. A plausible explanation for the higher efficiency of MeO-Suc-AAAPL-CH(2)Cl 6b over control is proposed based on the molecular modeling studies. (C) 2010 Elsevier Ltd. All rights reserved.