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Default Solid-state NMR characterization of amphomycin effects on peptidoglycan and wall teichoic acid biosyntheses in Staphylococcus aureus.

Solid-state NMR characterization of amphomycin effects on peptidoglycan and wall teichoic acid biosyntheses in Staphylococcus aureus.

Related Articles Solid-state NMR characterization of amphomycin effects on peptidoglycan and wall teichoic acid biosyntheses in Staphylococcus aureus.

Sci Rep. 2016 08 19;6:31757

Authors: Singh M, Chang J, Coffman L, Kim SJ

Abstract
Amphomycin and MX-2401 are cyclic lipopeptides exhibiting bactericidal activities against Gram-positive pathogens. Amphomycin and MX-2401 share structural similarities with daptomycin, but unlike daptomycin they do not target bacterial membrane. In this study, we investigate in vivo modes of action for amphomycin and MX-2401 in intact whole cells of Staphylococcus aureus by measuring the changes of peptidoglycan and wall teichoic acid compositions using solid-state NMR. S. aureus were grown in a defined media containing isotope labels [1-(13)C]glycine and L-[?-(15)N]lysin, L-[1-(13)C]lysine and D-[(15)N]alanine, or D-[1-(13)C]alanine and [(15)N]glycine, to selectively (13)C-(15)N pair label peptidoglycan bridge-link, stem-link, and cross-link, respectively. (13)C{(15)N} and (15)N{(13)C} rotational-echo double resonance NMR measurements determined that cyclic lipopeptide-treated S. aureus exhibited thinning of the cell wall, accumulation of Park's nucleotide, inhibition of glycine utilization for purine biosynthesis, reduction of ester-linked D-Ala in teichoic acids, and reduction of peptidoglycan cross-linking. Whole cell NMR analysis also revealed that S. aureus, in presence of amphomycin and MX-2401, maintained the incorporation of D-Ala during peptidoglycan biosynthesis while the incorporation of D-Ala into teichoic acids was inhibited. These effects are consistent with amphomycin's dual inhibition of both peptidoglycan and wall teichoic acid biosyntheses in S. aureus.


PMID: 27538449 [PubMed - indexed for MEDLINE]



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