Bacteriocin AS-48, a Microbial Cyclic Polypeptide Structurally and Functionally Related to Mammalian NK-lysin

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2000 Sep 27

PMID 11005847

Citations 61

Authors

C Gonzalez

G M Langdon

M Bruix

A Galvez

E Valdivia

M Maqueda

M Rico

Affiliations

Soon will be listed here.

Abstract

The solution structure of bacteriocin AS-48, a 70-residue cyclic polypeptide from Enterococcus faecalis, consists of a globular arrangement of five alpha-helices enclosing a compact hydrophobic core. The head-to-tail union lies in the middle of helix 5, a fact that is shown to have a pronounced effect on the stability of the three-dimensional structure. Positive charges in the side chains of residues in helix 4 and in the turn linking helix 4 to helix 5 form a cluster that most probably determine its antibacterial activity by promoting pore formation in cell membranes. A similar five-helix structural motif has been found in the antimicrobial NK-lysin, an effector polypeptide of T and natural killer (NK) cells. Bacteriocin AS-48 lacks the three disulfide bridges characteristic of the saposin fold present in NK-lysin, and has no sequence homology with it. Nevertheless, the similar molecular architecture and high positive charge strongly suggest a common mechanism of antibacterial action.

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