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Related Experiment Videos

TEM- and SHV-derived extended-spectrum beta-lactamases: relationship between selection, structure and function

S K Du Bois1, M S Marriott, S G Amyes

  • 1Department of Medical Microbiology, Medical School, University of Edinburgh, UK.

The Journal of Antimicrobial Chemotherapy
|January 1, 1995
PubMed
Summary
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Later-generation cephalosporins faced rapid resistance due to mutations in TEM and SHV beta-lactamase genes. These genetic changes enhanced enzyme activity, enabling hydrolysis of newer antibiotics.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Earlier beta-lactam antibiotics faced resistance mediated by beta-lactamase enzymes.
  • Later-generation cephalosporins were designed to circumvent this resistance.

Purpose of the Study:

  • To investigate the molecular mechanisms by which beta-lactamase enzymes evolved resistance to newer cephalosporins.
  • To understand the role of specific mutations in conferring enhanced hydrolytic activity.

Main Methods:

  • Analysis of plasmid-encoded TEM and SHV beta-lactamase genes.
  • Identification of point mutations affecting amino acids at the enzyme's active site.
  • Correlation of structural changes with altered enzymatic activity and drug resistance.

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Main Results:

  • Plasmid-borne TEM and SHV beta-lactamase genes rapidly acquired point mutations post-cephalosporin introduction.
  • Mutations altered active site amino acids, enabling hydrolysis of later-generation cephalosporins.
  • Successive mutations cumulatively increased resistance, with altered functions linked to structural changes.

Conclusions:

  • Beta-lactamase evolution is a rapid process driven by selective pressure from new antibiotics.
  • Specific amino acid substitutions in beta-lactamases are critical for overcoming cephalosporin efficacy.
  • Understanding these evolutionary dynamics is key to developing future antimicrobial strategies.