dc.contributor.authorSaravanan, Rathi
dc.contributor.authorLi, Xiang
dc.contributor.authorLim, Kaiyang
dc.contributor.authorMohanram, Harini
dc.contributor.authorPeng, Li
dc.contributor.authorMishra, Biswajit
dc.contributor.authorBasu, Anindya
dc.contributor.authorLee, Jong-Min
dc.contributor.authorBhattacharjya, Surajit
dc.contributor.authorLeong, Susanna Su Jan
dc.identifier.citationSaravanan, R., Li, X., Lim, K., Mohanram, H., Peng, L., Mishra, B., et al. (2014). Design of short membrane selective antimicrobial peptides containing tryptophan and arginine residues for improved activity, salt-resistance, and biocompatibility. Biotechnology and Bioengineering, 111(1), 37-49.en_US
dc.description.abstractAntimicrobial peptides (AMPs) kill microbes by non-specific membrane permeabilization, making them ideal templates for designing novel peptide-based antibiotics that can combat multi-drug resistant pathogens. For maximum efficacy in vivo and in vitro, AMPs must be biocompatible, salt-tolerant and possess broad-spectrum antimicrobial activity. These attributes can be obtained by rational design of peptides guided by good understanding of peptide structure-function. Toward this end, this study investigates the influence of charge and hydrophobicity on the activity of tryptophan and arginine rich decamer peptides engineered from a salt resistant human β-defensin-28 variant. Mechanistic investigations of the decamers with detergents mimicking the composition of bacterial and mammalian membrane, reveal a correlation between improved antibacterial activity and the increase in tryptophan and positive residue content, while keeping hemolysis low. The potent antimicrobial activity and high cell membrane selective behavior of the two most active decamers, D5 and D6, are attributed to an optimum peptide charge to hydrophobic ratio bestowed by systematic arginine and tryptophan substitution. D5 and D6 show surface localization behavior with binding constants of 1.86 × 108 and 2.6 × 108 M−1, respectively, as determined by isothermal calorimetry measurements. NMR derived structures of D5 and D6 in SDS detergent micelles revealed proximity of Trp and Arg residues in an extended structural scaffold. Such potential cation–π interactions may be critical in cell permeabilization of the AMPs. The fundamental characterization of the engineered decamers provided in this study improves the understanding of structure–activity relationship of short arginine tryptophan rich AMPs, which will pave the way for future de novo design of potent AMPs for therapeutic and biomedical applications.en_US
dc.relation.ispartofseriesBiotechnology and bioengineeringen_US
dc.rights© 2013 Wiley Periodicals, Inc.en_US
dc.titleDesign of short membrane selective antimicrobial peptides containing tryptophan and arginine residues for improved activity, salt-resistance, and biocompatibilityen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.schoolSchool of Biological Sciencesen_US

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