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Penicillin-binding proteins of pathogenic Escherichia coli strains
R C Ferreira1, S O Costa, L C Ferreira
1Departamento de Microbiologia, Universidade de São Paulo, Brazil. ritacafe@usp.br
Abstract:
The penicillin-binding proteins of 11 pathogenic Escherichia coli strains, including enteropathogenic, enterotoxigenic, enteroinvasive, enteroaggregative, and enterohemorrhagic E. coli, were detected in gels following the labeling of isolated cell envelopes with [3H]benzylpenicillin. The electrophoretic profiles, sensitivities to and morphological changes induced by beta-lactam antibiotics showed that the penicillin-binding proteins of most pathogenic E. coli possess structural and physiological functions similar to those of E. coli K12.
Insights
Penicillin-binding proteins in pathogenic Escherichia coli strains share functions with E. coli K12. This study compared protein profiles and antibiotic sensitivities across various pathogenic E. coli types.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Pathogenic Escherichia coli strains cause various infections.
- Understanding their cellular mechanisms is crucial for developing effective treatments.
- Penicillin-binding proteins (PBPs) are key targets for beta-lactam antibiotics.
Purpose of the Study:
- To investigate the penicillin-binding proteins (PBPs) in diverse pathogenic E. coli strains.
- To compare the characteristics of PBPs in pathogenic E. coli with the reference strain E. coli K12.
- To assess the implications for beta-lactam antibiotic efficacy.
Main Methods:
- Isolated cell envelopes from 11 pathogenic E. coli strains.
- Labeled cell envelopes with [3H]benzylpenicillin.
- Analyzed penicillin-binding proteins using gel electrophoresis.
- Assessed sensitivities to beta-lactam antibiotics and observed morphological changes.
Main Results:
- Penicillin-binding proteins were detected in all tested pathogenic E. coli strains.
- Electrophoretic profiles indicated similarities between pathogenic E. coli PBPs and those of E. coli K12.
- Pathogenic E. coli PBPs exhibited comparable sensitivities to beta-lactam antibiotics.
- Morphological changes induced by antibiotics were consistent with E. coli K12 responses.
Conclusions:
- Most pathogenic E. coli strains possess penicillin-binding proteins with structural and physiological functions similar to E. coli K12.
- These findings suggest conserved PBP functions across different E. coli pathotypes.
- The study provides insights into the potential effectiveness of beta-lactam antibiotics against pathogenic E. coli.