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Staphylococcus aureus has clustered tRNA genes

C J Green1, B S Vold

  • 1SRI International, Menlo Park, California 94025.

Journal of Bacteriology
|August 1, 1993
PubMed
Summary
This summary is machine-generated.

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Researchers discovered a large transfer RNA (tRNA) gene cluster in Staphylococcus aureus using polymerase chain reaction (PCR). This cluster contains 27 tRNA genes, including unusual Gly-tRNAs potentially involved in cell wall synthesis.

Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Transfer RNA (tRNA) genes are essential for protein synthesis.
  • Bacterial genomes contain tRNA gene clusters, varying in size and organization.
  • Previous studies identified tRNA gene clusters in various bacteria, including Bacillus subtilis.

Purpose of the Study:

  • To detect and characterize large tRNA gene clusters in gram-positive bacteria using polymerase chain reaction (PCR).
  • To investigate the structure and potential function of an unusually large tRNA gene cluster identified in Staphylococcus aureus.

Main Methods:

  • Polymerase chain reaction (PCR) with primers based on conserved gram-positive bacterial tRNA(Arg) and tRNA(Phe) sequences.
  • Identification of a specific DNA fragment using PCR-generated probes.

Related Experiment Videos

  • Southern analysis of restriction digests of Staphylococcus aureus DNA.

    • Main Results:

    • A large tRNA gene cluster containing 27 tRNA genes was detected in Staphylococcus aureus, located 3' to an rRNA operon.
    • The gene order at the 5' end of the S. aureus cluster resembles that of B. subtilis clusters, while the 3' end shows similarity to a B. subtilis 16-tRNA cluster.
    • Three unusual Gly-tRNAs within the S. aureus cluster may be involved in peptidoglycan synthesis, not protein synthesis.
    • Staphylococcus aureus possesses five to six rRNA operons, likely associated with large 3' tRNA gene clusters.

    Conclusions:

    • Staphylococcus aureus harbors a unique and extensive tRNA gene cluster.
    • The identified Gly-tRNAs suggest a specialized role beyond standard protein synthesis.
    • The genomic organization indicates potential evolutionary relationships and conserved mechanisms for tRNA gene cluster organization in bacteria.