AUTHOR=Reiners Jens , Lagedroste Marcel , Ehlen Katja , Leusch Selina , Zaschke-Kriesche Julia , Smits Sander H. J. 

TITLE=The N-terminal Region of Nisin Is Important for the BceAB-Type ABC Transporter NsrFP from Streptococcus agalactiae COH1

JOURNAL=Frontiers in Microbiology

VOLUME=Volume 8 - 2017

YEAR=2017

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2017.01643

DOI=10.3389/fmicb.2017.01643

ISSN=1664-302X

ABSTRACT=Lantibiotics are (methyl)-lanthionine-containing antimicrobial peptides produced by several Gram-positive bacteria. Some human pathogenic bacteria express specific resistance proteins that counteract this antimicrobial activity of lantibiotics. In Streptococcus agalactiae COH1 resistance against the well-known lantibiotic nisin is conferred by, the nisin resistance protein (NSR), a two-component system (NsrRK) and a BceAB-type ABC transporter (NsrFP).
The present study focuses on elucidating the function of NsrFP via its heterologous expression in Lactoccocus lactis. NsrFP is able to convert a 16-fold resistance against wild type nisin as determined by growth inhibition experiments and functions as a lantibiotic exporter. Several C-terminal nisin mutants indicated that NsrFP recognizes the N-terminal region of nisin. The N-terminus harbours two (methyl)-lanthionine rings, which are conserved in other lantibiotics.