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Structure-based classification of class A beta-lactamases, an update.

Alain Philippon1, Hervé Jacquier2, Etienne Ruppé3

  • 1Faculté de Médecine Paris Descartes, Service de Bactériologie, Paris, France.

Current Research in Translational Medicine
|June 4, 2019
PubMed
Summary
This summary is machine-generated.

Class A beta-lactamases, prevalent in Gram-negative bacteria, are classified using structural motifs and amino acid residues. This detailed classification reveals subclasses and groups, aiding in understanding antibiotic resistance mechanisms.

Keywords:
Class A beta-lactamasesClassificationClusterPrimary structureSubclass

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Area of Science:

  • Biochemistry and Molecular Biology
  • Microbiology and Infectious Diseases
  • Genomics and Bioinformatics

Background:

  • Beta-lactamase synthesis in Gram-negative bacilli is a primary mechanism of resistance to beta-lactam antibiotics.
  • These enzymes are categorized into four molecular classes (A-D), with Class A serine enzymes being prevalent and susceptible to inhibitors.
  • Advances in genomic approaches and sequencing technology have generated vast amounts of data on these enzymes.

Purpose of the Study:

  • To develop a structure-based classification for Class A beta-lactamases.
  • To identify conserved motifs and amino acid residues critical for catalytic mechanisms and substrate binding.
  • To analyze the diversity of Class A beta-lactamase primary structures for phylogenetic classification.

Main Methods:

  • Utilized genomic data and automatic sequencer technology to analyze a large dataset of beta-lactamase sequences.
  • Employed a structure-based approach, focusing on conserved motifs (e.g., S70XXK, S130DN, K234TG) and specific amino acid residues.
  • Validated the classification on 700 amino acid sequences, including 132 representative types and probable enzyme sequences from environmental bacteria.

Main Results:

  • A structure-based classification was established for Class A beta-lactamases, incorporating catalytic and substrate-binding motifs.
  • Two subclasses (A1, A2) and six major clusters (e.g., LSBL, WSBL) were identified based on conserved motifs and specific residues.
  • Specific motifs and residues, including a probable disulfide bridge (C77-C123), were highlighted for subclasses and the LSBL group.

Conclusions:

  • The study provides a refined, structure-based and phylogenetic classification of Class A beta-lactamases.
  • This classification highlights the significant diversity within Class A beta-lactamases, based on primary structure.
  • Understanding this diversity is crucial for tracking the evolution of antibiotic resistance and developing new therapeutic strategies.