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J. Bacteriol., 01 1996, 168-174, Vol 178, No. 1
Copyright © 1996, American Society for Microbiology

Naturally occurring peptidoglycan variants of Streptococcus pneumoniae

A Severin and A Tomasz
Rockefeller University, New York, New York 10021, USA.

Analysis by high-performance liquid chromatography of the stem peptide composition of cell walls purified from a large number of pneumococcal strains indicates that these bacteria produce a highly conserved species-specific peptidoglycan independent of serotype, isolation date, and geographic origin. Characteristic features of this highly reproducible peptide pattern are the dominance of linear stem peptides with a monomeric tripeptide, a tri-tetra linear dimer, and two indirectly cross-linked tri-tetra dimers being the most abundant components. Screening of strains with the high-performance liquid chromatography technique has identified two naturally occurring peptidoglycan variants in which the species-specific stem peptide composition was replaced by two drastically different and distinct stem peptide patterns, each unique to the particular clone of pneumococci producing it. Both isolates were multidrug resistant, including resistance to penicillin. In one of these clones--defined by multilocus enzyme analysis and pulsed-field gel electrophoresis of the chromosomal DNAs--the linear stem peptides were replaced by branched peptides that most frequently carried an alanyl-alanine substituent on the epsilon amino group of the diamino acid residue. In the second clone, the predominant stem peptide species replacing the linear stem peptides carried a seryl-alanine substituent. The abnormal peptidoglycans may be related to the altered substrate preference of transpeptidases (penicillin-binding proteins) in the pneumococcal variants.


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