1887

Abstract

The operon in Gram-positive bacteria encodes proteins that are necessary for the addition of -alanine to teichoic acids of the cell wall. The addition of -alanine to the cell wall results in a net positive charge on the bacterial cell surface and, as a consequence, can decrease the effectiveness of antimicrobials, such as cationic antimicrobial peptides (CAMPs). Although the roles of the genes have been studied for some Gram-positive organisms, the arrangement of these genes in and the life cycle of the bacterium in the host are markedly different from those of other pathogens. In the current work, we determined the contribution of the putative operon to CAMP resistance. Our data indicate that the operon is necessary for full resistance of to nisin, gallidermin, polymyxin B and vancomycin. We propose that the -alanylation of teichoic acids provides protection against antimicrobial peptides that may be essential for growth of in the host.

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2011-05-01
2019-09-22
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