抗菌剂
细菌
肽
微生物学
抗菌肽
革兰氏阴性菌
生物物理学
细胞生物学
生物
大肠杆菌
遗传学
生物化学
基因
作者
Nhan Dai Thien Tram,Xie Jian,Devika Mukherjee,Antonio Eduardo Obanel,Venkatesh Mayandi,Vanitha Selvarajan,Xin Zhu,Jeanette Teo,Veluchamy A Barathi,Rajamani Lakshminarayanan,Pui Lai Rachel Ee
标识
DOI:10.1002/adfm.202210858
摘要
Abstract Bacterial trapping using nanonets is a ubiquitous immune defense mechanism against infectious microbes. These nanonets can entrap microbial cells, effectively arresting their dissemination and rendering them more vulnerable to locally secreted microbicides. Inspired by this evolutionarily conserved anti‐infective strategy, a series of 15 to 16 residue‐long synthetic β‐hairpin peptides is herein constructed with the ability to self‐assemble into nanonets in response to the presence of bacteria, enabling spatiotemporal control over microbial killing. Using amyloid‐specific K114 assay and confocal microscopy, the membrane components lipoteichoic acid and lipopolysaccharide are shown to play a major role in determining the amyloid‐nucleating capacity as triggered by Gram‐positive and Gram‐negative bacteria respectively. These nanonets displayed both trapping and killing functionalities, hence offering a direct improvement from the trap‐only biomimetics in literature. By substituting a single turn residue of the non‐amyloidogenic BTT1 peptide, the nanonet‐forming BTT1‐3A analog is produced with comparable antimicrobial potency. With the same sequence manipulation approach, BTT2‐4A analog modified from BTT2 peptide showed improved antimicrobial potency against colistin‐resistant clinical isolates. The peptide nanonets also demonstrated robust stability against proteolytic degradation, and promising in vivo efficacy and biosafety profile. Overall, these bacteria‐responsive peptide nanonets are promising clinical anti‐infective alternatives for circumventing antibiotic resistance.
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