Chitosan-Based Peptidopolysaccharides as Cationic Antimicrobial Agents and Antibacterial CoatingsClick to copy article linkArticle link copied!
- Dicky PranantyoDicky PranantyoDepartment of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Kent Ridge, Singapore 117585More by Dicky Pranantyo
- Li Qun XuLi Qun XuDepartment of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Kent Ridge, Singapore 117585More by Li Qun Xu
- En-Tang Kang*En-Tang Kang*E-mail: cheket@nus.edu.sgDepartment of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Kent Ridge, Singapore 117585More by En-Tang Kang
- Mary B. Chan-Park*Mary B. Chan-Park*E-mail: mbechan@ntu.edu.sgCentre of Antimicrobial Bioengineering School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459More by Mary B. Chan-Park
Abstract
The rapid spread of multidrug-resistant bacteria has called for effective antimicrobial agents which work on a more direct mechanism of killing. Cationic peptidopolysaccharides are developed in the present work to mimic the peptidoglycan structure of bacteria and to enhance the membrane-compromising bactericidal efficacy. Antimicrobial CysHHC10 peptide was grafted to the C-2 (amino) or C-6 (hydroxyl) position of chitosan backbone via thiol-maleimide “click” conjugation, utilizing the maleimidohexanoic linkers. The peptidopolysaccharide with primary amino backbone intact (CSOHHC) exhibited higher bactericidal activity toward Gram-positive and Gram-negative bacteria, in comparison to that with amino backbone grafted with the peptide (CSNHHC). Both peptidopolysaccharides also exhibited lower hemolytic activity and cytotoxicity than free CysHHC10 peptide due to the moderation effect contributed by the chitosan backbone. For targeting the Gram-positive bacteria in particular, the CSOHHC expressed 4- and 2-fold increases in hemo- and cytoselectivity, respectively, as compared to the CysHHC10 peptide. In an extended application, peptidopolysaccharide antibacterial coatings were formed via layer-by-layer assembly with tannic acid. The peptidopolysaccharide coatings readily killed the adhered bacteria upon contact while being cytocompatible by maintaining more than 60% viability for the adhered fibroblasts. Therefore, the peptidoglycan-mimetic peptidopolysaccharides are potential candidates for anti-infective drugs in biomedical applications.
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