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First insights into a type II toxin-antitoxin system from the clinical isolate Mycobacterium sp MHSD3, similar to epsilon/zeta systems

Journal article
Authors Daniel Jaen-Luchoro
Francisco Aliaga-Lozano
R. M. Gomila
M. Gomila
Francisco Salvà-Serra
J. Lalucat
A. Bennasar-Figueras
Published in Plos One
Volume 12
Issue 12
ISSN 1932-6203
Publication year 2017
Published at Institute of Biomedicine, Department of Infectious Medicine
Centre for antibiotic resistance research, CARe
Language en
Links doi.org/10.1371/journal.pone.018945...
Keywords programmed cell-death, protein-structure, structural mechanisms, chelonae infection, bacillus-subtilis, crystal-structure, escherichia-coli, bacteria, stress, algorithms
Subject categories Infectious Medicine, Bacteriology

Abstract

A putative type II toxin-antitoxin (TA) system was found in the clinical isolate Mycobacterium sp. MHSD3, a strain closely related to Mycobacterium chelonae. Further analyses of the protein sequences of the two genes revealed the presence of domains related to a TA system. BLAST analyses indicated the presence of closely related proteins in the genomes of other recently published M. chelonae strains. The functionality of both elements of the TA system was demonstrated when expressed in Escherichia coli cells, and the predicted structure of the toxin is very similar to those of well-known zeta-toxins, leading to the definition of a type II TA system similar to epsilon/zeta TA systems in strains that are closely related to M. chelonae.

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