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Related Experiment Videos

Inteins invading mycobacterial RecA proteins.

I Saves1, M A Lanéelle, M Daffé

  • 1Institut de Pharmacologie et Biologie Structurale UMR5089, CNRS Université Paul Sabatier Toulouse III, Toulouse, France. saves@ipbs.fr

FEBS Letters
|October 18, 2000
PubMed
Summary

Five new RecA inteins were found in mycobacteria, inserted at the RecA-b site. Their presence doesn't link to pathogenicity or growth rates in these bacterial species.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • RecA proteins are crucial for DNA repair and recombination in bacteria.
  • Inteins are protein segments that excise themselves from precursor proteins.
  • The role of inteins in mycobacteria, particularly at the RecA locus, requires further investigation.

Purpose of the Study:

  • To identify and characterize novel inteins within the RecA gene of various mycobacterial strains.
  • To understand the distribution and allelic family of RecA inteins in mycobacteria.
  • To investigate potential correlations between RecA intein presence and species-specific characteristics.

Main Methods:

  • Bioinformatic survey of the recA gene in 39 mycobacterial strains.
  • Sequence analysis of identified inteins and their insertion sites.

Related Experiment Videos

  • Comparative analysis of RecA intein sequences across different species.

    • Main Results:

    • Discovery of five new inteins in Mycobacterium chitae, M. fallax, M. gastri, M. shimodei, and M. thermoresistibile.
    • All identified inteins were located at the RecA-b insertion site and belonged to the MleRecA allelic family.
    • The RecA-b site sequence is conserved across species, while the RecA-a site intein is unique to M. tuberculosis.
    • No correlation was found between intein presence and pathogenicity or growth rate.

    Conclusions:

    • The RecA-b site is a common intein insertion point in diverse mycobacteria.
    • RecA inteins in mycobacteria represent a conserved allelic family.
    • Intein occurrence at the RecA-b site is independent of key mycobacterial species characteristics.