Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 12, Pages 6730-6734Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.03.106
Keywords
Weissela paramesenteroides; Weissellin A; Bacteriocin; Amino acid sequence; Biopreservative
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Weissella paramesenteroides DX has been shown to produce a 4450-Da class ha bacteriocin, weissellin A, composed of 43 amino acids with the sequence KNYGNGVYCNKHKCSVDWATFSANIANNSVAMAGLTGGNAGN. The bacteriocin shares 68% similarity with leucocin C from Leuconostoc mesenteroides. Computational analyses predict that the bacteriocin is a hydrophobic molecule with a beta-sheet type conformation. Weissellin A exhibited various levels of activity against all gram-positive bacteria tested, but was not active against Salmonella enterica Enteritidis. The antimicrobial activity was not associated with target-cell lysis. The bacteriocin retained activity after exposure to 121 degrees C for 60 min or to -20 degrees C for 6 months, and to pH 2.0-10.0. It was not sensitive to trypsin, alpha-chymotrypsin, pepsin and papain, but was inactivated by proteinase K. At a dissolved oxygen concentration of 50%, weissellin A was produced with growth-associated kinetics. The properties of weissellin A make this bacteriocin a potentially suitable agent for food and feed preservation. (C) 2011 Elsevier Ltd. All rights reserved.
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