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Novel anoplin‐based (lipo)‐peptide models show potent antimicrobial activity
Author(s) -
Stergiou Vasileios,
Krikorian Dimitrios,
Koukkou AnnaIrini,
SakarellosDaitsiotis Maria,
PanouPomonis Eugenia
Publication year - 2021
Publication title -
journal of peptide science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 66
eISSN - 1099-1387
pISSN - 1075-2617
DOI - 10.1002/psc.3303
Subject(s) - chemistry , antimicrobial , peptide , circular dichroism , antimicrobial peptides , stereochemistry , lipopeptide , pharmaceutics , bacteria , cyclic peptide , peptide synthesis , antibiotics , biological activity , combinatorial chemistry , biochemistry , biology , in vitro , organic chemistry , pharmacology , genetics
The subject of this study is the synthesis and biological evaluation of anoplin‐based (Gly‐Leu‐Leu 3 ‐Lys‐Arg 5 ‐Ile‐Lys‐Thr 8 ‐Leu‐Leu‐NH 2 )—designed (lipo)‐peptides, aiming at the development of new antibiotic substances. The design of synthetic compounds based on natural bioactive molecules is an optimistic strategy for the development of new pharmaceutics. Antimicrobial peptides (AMPs) and (lipo)‐peptides are two classes of promising compounds, with characteristics that allow them to express their activity by differentiated mechanisms of action. On this basis, anoplin, a natural AMP, was used as a scaffold to design five peptides and seven lipopeptide analogs of them. Substitutions were made on residues Leu 3 and Arg 5 of the interphase and on Thr 8 of the polar phase, as well as N‐terminus conjunctions with octanoic and decanoic acid. The outcome of the biological evaluation revealed that some analogs might have substantial clinical potential. Specifically, Ano 1‐F, Ano 3‐F, Ano 4‐C 10 , and Ano 5‐F are strongly active against Gram‐negative bacteria at minimum inhibitory concentration (MIC) values of 3 μg/ml, while Ano 4‐F is active against Gram‐positive bacteria at 1 μg/ml. Ano 2‐C 10 , C 10 ‐Gly‐Leu‐Lys 3 ‐Lys‐Ile 5 ‐Ile‐Lys‐Lys 8 ‐Leu‐Leu‐NH 2 , is the most promising compound (MIC = 0.5 μg/ml) for the development of new pharmaceutics. The conformational features of the synthetic peptides were investigated by circular dichroism spectroscopy, and their physicochemical parameters were calculated. Our study shows that appropriate substitutions in the anoplin sequence in combination with N α ‐acylation may lead to new effective AMPs.