Synthetically modified l-histidine-rich peptidomimetics exhibit potent activity against Cryptococcus neoformans
作者:Amit Mahindra、Nitin Bagra、Nishima Wangoo、Rohan Jain、Shabana I. Khan、Melissa R. Jacob、Rahul Jain
DOI:10.1016/j.bmcl.2014.04.120
日期:2014.7
We describe the synthesis and antimicrobial evaluation of structurally new peptidomimetics, rich in synthetically modified L-histidine. Two series of tripeptidomimetics were synthesized by varying lipophilicity at the C-2 position of L-histidine and at the N- and C-terminus. The data indicates that peptides (5f, 6f, 9f and 101) possessing highly lipophilic adamantan-1-yl group displayed strong inhibition of Cryptococcus neoformans. Peptide 6f is the most potent of all with IC50 and MFC values of 0.60 and 0.63 mu g/mL, respectively, compared to the commercial drug amphotericin B (IC50 = 0.69 and MFC = 1.25 mu g/mL). The selectivity of these peptides to microbial pathogen was examined by a tryptophan fluorescence quenching study and transmission electron microscopy. These studies indicate that the peptides plausibly interact with the mimic membrane of pathogen by direct insertion, and results in disruption of membrane of pathogen. (C) 2014 Elsevier Ltd. All rights reserved.