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. 1996 Jul;178(13):3962–3966. doi: 10.1128/jb.178.13.3962-3966.1996

A simple gel electrophoretic method for analyzing the muropeptide composition of bacterial peptidoglycan.

K D Young 1
PMCID: PMC232661  PMID: 8682805

Abstract

The muropeptide composition of bacterial peptidoglycan is currently most efficiently determined by reverse-phase high-pressure liquid chromatography (HPLC). Though sensitive, the HPLC procedure is technically demanding and has been applied to a relatively small number of bacterial strains and species. We have found that fluorescence-assisted carbohydrate electrophoresis (FACE) is a simple, rapid method by which reducing muropeptides from multiple peptidoglycan samples can be visualized. Individual reducing muropeptides were covalently labeled with the fluorescent molecule 8-aminonaphthalene-1,3,6-trisulfonic acid, after which they were separated by electrophoresis through a 35% polyacrylamide gel and visualized by exposure to UV light. FACE detected the appropriate numbers of reducing muropeptides in the proper proportions for four bacteria: Escherichia coli, Pseudomonas aeruginosa, Enterobacter cloacae, and Yersinia enterocolitica. As little as 2 to 5 pmol per muropeptide was detected when the intensity of the fluorescent signal was measured with a charge-coupled device camera, at a level of sensitivity between 50 and 250 times higher than that of the classic HPLC technique. Thus, FACE may be used to identify interesting peptidoglycan samples prior to more-extensive analysis by HPLC, or FACE may eventually replace HPLC for some applications.

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Selected References

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