Further Identification of Novel Lantibiotic Operons Using LanM-Based Genome Mining

Probiotics and Antimicrobial Proteins
Orla O'SullivanColin Hill

Abstract

Lantibiotics are gene-encoded antimicrobial peptides that are distinguished by the presence of the unusual structures, lanthionine and β-methyllanthionine, which are introduced through enzyme-catalysed post-translational modification. Lantibiotics can be subdivided on the basis of the nature of the enzyme(s) which catalyse this reaction. Lantibiotic synthetases, generically designated LanM, which catalyse the dehydration of serines (and threonines) followed by the formation lanthionine (and β-methyllanthioine), are responsible for the synthesis of the largest subdivision, type 2. One can take advantage of the conserved nature of LanM proteins to screen for and bioinformatically characterize novel lantibiotic-encoding operons in genome-sequenced microorganisms. Having employed this strategy with success previously, here we update the investigation to reveal the existence of 124 LanM homologs encoded within genome-sequenced microbes. Further analysis focussed specifically on 9 novel lantibiotic gene clusters in Anaerocellum thermophilum DSM 6725, Anaerococcus tetradius ATCC 35098, Corynebacterium matruchotti ATCC 33806, Streptococcus suis 98HAH33, Geobacillus sp. G11MC16, Nostoc punctiforme PCC 73102 (× 2; one on plasmid and one ...Continue Reading

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