Please use this identifier to cite or link to this item: https://biore.bio.bg.ac.rs/handle/123456789/1488
Title: Lactococcin B Is Inactivated by Intrinsic Proteinase PrtP Digestion in Lactococcus lactis subsp. Lactis BGMN1-501
Authors: Vukotić, Goran 
Polovic, Natalija
Mirkovic, Nemanja
Jovčić, Branko 
Stanisavljevic, Nemanja
Fira, Djordje 
Kojic, Milan
Keywords: Bacteriocin LcnB;Hydrolysis;Inactivation;Lactococcus lactis;Proteinase PrtP
Issue Date: 1-Jan-2019
Rank: M21
Journal: Frontiers in Microbiology
Abstract: 
Copyright © 2019 Vukotic, Polovic, Mirkovic, Jovcic, Stanisavljevic, Fira and Kojic. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. In our previous study we demonstrated that proteinase PrtP is able to impair bacteriocin LcnB activity, despite being produced by the same organism and encoded by the same plasmid. However, precise mechanism of this action, i.e., the exact cleavage site within LcnB bacteriocin, as well as its effect on antimicrobial activity of the resulting peptide remained vague. Here we further explored the interplay between these two proteins and defined, using mass spectrometry, that this unusual hydrolysis indeed occurs in vivo, between the sixth and seventh amino acid on the N terminus of LcnB. To address whether the cleaved form of LcnB retains any level of activity, both recombinant and chemically synthesized variant of truncated LcnB were engineered and produced, but demonstrated no antimicrobial activity. When LcnB was recombinantly overexpressed and subjected to PrtP digestion, the change in its antimicrobial activity was monitored and the degradation products analyzed with reverse-phase high-pressure liquid chromatography. The results confirmed the inactivity of the truncated LcnB and additionally corroborated the PrtP cleavage site in LcnB bacteriocin. In addition, it was demonstrated that, once truncated, LcnB is not able to bind its receptor and is susceptible to additional hydrolysis. This is the first report on proteolytic inactivation of bacteriocins inside the same bacterial host.
URI: https://biore.bio.bg.ac.rs/handle/123456789/1488
ISSN: 1664-302X
DOI: 10.3389/fmicb.2019.00874
Appears in Collections:Journal Article

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