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Related Experiment Videos

Peptidoglycan synthesis by Enterococcus faecalis penicillin binding protein 5

C Signoretto1, M Boaretti, P Canepari

  • 1Istituto di Microbiologia, Università di Verona, Strada Le Grazie, 37134 Verona, Italy.

Archives of Microbiology
|July 31, 1998
PubMed
Summary

Low-affinity penicillin-binding proteins (PBPs) in enterococci enable survival against beta-lactams. PBP5 synthesizes peptidoglycan with fewer higher oligomers, indicating reduced specificity for cell wall construction.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Low-affinity penicillin-binding proteins (PBPs) confer beta-lactam antibiotic resistance in enterococci.
  • These PBPs are essential for cell survival under high beta-lactam concentrations, suggesting a role in complete peptidoglycan synthesis.

Purpose of the Study:

  • To investigate the peptidoglycan synthesis capabilities of the low-affinity PBP5 from Enterococcus faecalis.
  • To compare peptidoglycan synthesized by PBP5 with that produced by the native PBPs (1, 2, and 3).

Main Methods:

  • Analysis of muropeptide composition using reversed-phase high-performance liquid chromatography (RP-HPLC).
  • Comparison of peptidoglycan synthesized by PBP5 versus normal PBPs in Enterococcus faecalis.

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Main Results:

  • Peptidoglycan synthesized by PBP5 lacked oligomers higher than trimers, indicating PBP5's transpeptidase component cannot utilize these as acceptor/donor.
  • Despite the lack of higher oligomers, total cross-linking was maintained due to an increase in dimer formation.
  • PBP5 produced a less precise peptidoglycan, with minor dimer components becoming prevalent, suggesting poor substrate specificity.

Conclusions:

  • Enterococcus faecalis PBP5 exhibits reduced substrate specificity, producing a less refined peptidoglycan structure.
  • The survival function of low-affinity PBPs like PBP5 is consistent with their role as multifunctional enzymes with inherent substrate limitations.