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Related Experiment Videos

Extended-spectrum beta-lactamases.

Laura L Larson1, Reuben Ramphal

  • 1Division of Infectious Diseases, Department of Medicine, University of Florida College of Medicine, Gainesville, FL 32610-0277, USA.

Seminars in Respiratory Infections
|September 13, 2002
PubMed
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Extended-spectrum beta-lactamases (ESBLs) are antibiotic resistance enzymes found in gram-negative bacteria. Their emergence and spread pose significant challenges for treating infections, particularly in healthcare settings.

Area of Science:

  • Microbiology
  • Biochemistry
  • Infectious Diseases

Background:

  • Extended-spectrum beta-lactamases (ESBLs) emerged in the 1980s due to broad-spectrum antibiotic use.
  • ESBLs are derived from progenitor beta-lactamases, conferring ampicillin resistance in gram-negative bacteria.
  • These enzymes are frequently located on plasmids, facilitating horizontal gene transfer.

Purpose of the Study:

  • To review the origins and evolution of ESBLs.
  • To discuss the impact of ESBLs on bacterial resistance mechanisms.
  • To highlight the clinical significance and patient care implications of ESBLs.

Main Methods:

  • Review of scientific literature on ESBLs.
  • Analysis of enzyme structure-function relationships.

Related Experiment Videos

  • Examination of epidemiological data on ESBL prevalence.

    • Main Results:

    • ESBLs result from amino acid substitutions in progenitor beta-lactamases, altering substrate specificity.
    • Common ESBL-producing bacteria include Klebsiella species and Escherichia coli.
    • ESBLs are implicated in hospital and nursing-home outbreaks, necessitating careful management.

    Conclusions:

    • ESBLs represent a significant threat to public health due to their resistance profiles.
    • Understanding ESBLs is crucial for developing effective treatment strategies.
    • The transferability of ESBLs underscores the need for infection control measures.