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Related Experiment Videos

PBP5 complementation of a PBP3 deficiency in Enterococcus hirae.

S Leimanis1, N Hoyez, S Hubert

  • 1Centre d'Ingénierie des Protéines, Université de Liège, Institut de Chimie, B6, B-4000 Liège, Belgium.

Journal of Bacteriology
|August 23, 2006
PubMed
Summary

Penicillin-binding protein 5 (PBP5) in enterococci is crucial for cell division and beta-lactam resistance. Its stability and function depend on specific protein regions, enabling it to substitute for other essential penicillin-binding proteins.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Enterococci exhibit low susceptibility to beta-lactam antibiotics due to the low-affinity penicillin-binding protein 5 (PBP5).
  • PBP5 possesses a unique ability to compensate for the inhibition of other penicillin-binding proteins (PBPs).

Purpose of the Study:

  • To investigate the substitution activity of PBP5 in Enterococcus hirae.
  • To identify specific regions within PBP5 responsible for its stability and essential suppletive functions.

Main Methods:

  • Site-directed mutagenesis was employed to analyze potential protein-protein interaction sites in the PBP5 N-terminal module.
  • A mutant strain (Enterococcus hirae SL2) with an interrupted pbp5 gene and inducible PBP3 synthesis was utilized.

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Main Results:

  • Noninduced SL2 cells lacking functional PBP5 could not divide, highlighting PBP5's essential role in cell division.
  • The T167-L184 region (site D) was identified as critical for PBP5 protein stability.
  • Mutations within the N-terminal globular domains, particularly the P197-N209 segment (site E), significantly impaired PBP5's suppletive activity.

Conclusions:

  • PBP5 is essential for enterococcal cell division and its stability is regulated by specific intramolecular sites.
  • The N-terminal globular domains of PBP5 are vital for its compensatory function, with site E being particularly important.