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Chembiochem. 2014 Jan 24;15(2):301-8. doi: 10.1002/cbic.201300509. Epub 2013 Dec 12.

Structural basis for antimicrobial activity of lasiocepsin.

Author information

1
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6 (Czech Republic).

Abstract

Lasiocepsin is a unique 27-residue antimicrobial peptide, isolated from Lasioglossum laticeps (wild bee) venom, with substantial antibacterial and antifungal activity. It adopts a well-defined structure consisting of two α-helices linked by a structured loop. Its basic residues form two distinct positively charged regions on the surface whereas aliphatic side chains contribute to solvent-accessible hydrophobic areas, thus emphasising the amphipathic character of the molecule. Lasiocepsin structurally belongs to the ShK family and shows a strong preference for anionic phospholipids; this is further augmented by increasing concentrations of cardiolipin, such as those found at the poles of bacterial cells. The membrane-permeabilising activity of the peptide is not limited to outer membranes of Gram-negative bacteria. The peptide interacts with phospholipids initially through its N terminus, and its degree of penetration is strongly dependent on the presence of cardiolipin.

KEYWORDS:

Lasioglossum laticeps; NMR spectroscopy; ShK family; antimicrobial peptides; membranes

PMID:
24339323
DOI:
10.1002/cbic.201300509
[Indexed for MEDLINE]

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