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Molecules. 2017 Nov 22;22(11). pii: E2037. doi: 10.3390/molecules22112037.

Large-Scale Analysis of Antimicrobial Activities in Relation to Amphipathicity and Charge Reveals Novel Characterization of Antimicrobial Peptides.

Author information

1
Department of Biotechnology, Asia University, Taichung 413, Taiwan. ck@asia.edu.tw.
2
Computational Biology Laboratory, Department of Computer Science & Engineering, National Taiwan Ocean University, Keelung 202, Taiwan. 10257001@ntou.edu.tw.
3
Computational Biology Laboratory, Department of Computer Science & Engineering, National Taiwan Ocean University, Keelung 202, Taiwan. kchang@ntou.edu.tw.

Abstract

It has been unclear to which antimicrobial activities (e.g., anti-gram-positive bacterial, anti-gram-negative bacterial, antifungal, antiparasitic, and antiviral activities) of antimicrobial peptides (AMPs) a given physiochemical property matters most. This is the first computational study using large-scale AMPs to examine the relationships between antimicrobial activities and two major physiochemical properties of AMPs-amphipathicity and net charge. The results showed that among all kinds of antimicrobial activities, amphipathicity and net charge best differentiated between AMPs with and without anti-gram-negative bacterial activities. In terms of amphipathicity and charge, all the AMPs whose activities were significantly associated with amphipathicity and net charge were alike except those with anti-gram-positive bacterial activities. Furthermore, the higher the amphipathic value, the greater the proportion of AMPs possessing both antibacterial and antifungal activities. This dose-response-like pattern suggests a possible causal relationship-dual antibacterial and antifungal activities of AMPs may be attributable to amphipathicity. These novel findings could be useful for identifying potent AMPs computationally.

KEYWORDS:

amphipathicity; antimicrobial activities; antimicrobial peptides; net charge

PMID:
29165350
PMCID:
PMC6150348
DOI:
10.3390/molecules22112037
[Indexed for MEDLINE]
Free PMC Article

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