Synthesis and antimicrobial activities of His(2-aryl)-Arg and Trp-His(2-aryl) classes of dipeptidomimetics
作者:Amit Mahindra、Krishna K. Sharma、Dinesh Rathore、Shabana. I. Khan、Melissa R. Jacob、Rahul Jain
DOI:10.1039/c4md00041b
日期:——
In this communication, we report the design, synthesis andin vitroantimicrobial activity of ultra short peptidomimetics.
在这份通讯中,我们报告了超短肽类模拟物的设计、合成和体外抗菌活性。
Discovery of a Membrane-Active, Ring-Modified Histidine Containing Ultrashort Amphiphilic Peptide That Exhibits Potent Inhibition of <i>Cryptococcus neoformans</i>
作者:Krishna K. Sharma、Indresh Kumar Maurya、Shabana I. Khan、Melissa R. Jacob、Vinod Kumar、Kulbhushan Tikoo、Rahul Jain
DOI:10.1021/acs.jmedchem.7b00481
日期:2017.8.10
The new structural classes of ultrashort peptides that exhibit potent microbicidal action have potential as future drugs. Herein, we report that C-2 arylated histidines containing tripeptides His(2-Ar)-Trp-His(2-Ar) exhibit potent antifungal activity against Cryptococcus neoformans with high selectivity. The most potent peptide 12f [His(2-biphenyl)-Trp-His(2-biphenyl)] displayed high in vitro activity against C. neoformans (IC50 = 0.35 mu g/mL, MIC = MFC = 0.63 mu g/mL) with a selectivity index of >28 and 2 times higher potency compared to amphotericin B. Peptide 12f exhibited proteolytic stability, with no apparent hemolytic activity. The mechanism of action study of 12f by confocal laser scanning microscopy and electron microscopy indicates nuclear fragmentation and membrane disruption of C. neoformans cells. Combinations of 12f with fluconazole and amphotericin B at subinhibitory concentration were synergistic against C. neoformans. This study suggests that 12f is a new structural class of amphiphilic peptide with rapid fungicidal activity caused by C. neoformans.