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Related Experiment Videos

Sequence analysis and evolutionary perspectives of ROB-1 beta-lactamase.

J M Juteau1, R C Levesque

  • 1Département de Microbiologie, Faculté de Médecine, Université Laval, Quebec, Canada.

Antimicrobial Agents and Chemotherapy
|July 1, 1990
PubMed
Summary

The ROB-1 beta-lactamase gene from Haemophilus influenzae was sequenced. Analysis revealed it is a class A enzyme with evolutionary links to gram-positive bacteria beta-lactamases.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Beta-lactamase enzymes confer bacterial resistance to beta-lactam antibiotics.
  • Haemophilus influenzae is a significant human pathogen.
  • Understanding novel beta-lactamase genes is crucial for combating antibiotic resistance.

Purpose of the Study:

  • To determine the nucleotide sequence of the ROB-1 beta-lactamase gene.
  • To classify the ROB-1 beta-lactamase based on sequence homology.
  • To investigate the evolutionary origins of the ROB-1 beta-lactamase.

Main Methods:

  • Nucleotide sequencing of the ROB-1 gene.
  • Bioinformatic analysis including statistical computer methods for sequence similarity assessment.
  • Alignment of amino acid sequences with known beta-lactamases.

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  • Use of mutation matrices to determine evolutionary distance.

    • Main Results:

    • The ROB-1 gene encodes a 305-amino acid polypeptide with a mature molecular mass of 30,424 Da.
    • ROB-1 exhibits low nucleic acid homology with other beta-lactamases.
    • Sequence analysis classifies ROB-1 as a class A beta-lactamase.
    • ROB-1 shows higher homology to beta-lactamases from gram-positive bacteria.

    Conclusions:

    • The ROB-1 beta-lactamase is a novel class A enzyme.
    • Its sequence characteristics provide insights into its evolutionary ancestry and divergence.
    • This finding contributes to the understanding of beta-lactamase diversity and evolution in bacteria.