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. 1993 Aug;175(16):5091–5096. doi: 10.1128/jb.175.16.5091-5096.1993

Staphylococcus aureus has clustered tRNA genes.

C J Green 1, B S Vold 1
PMCID: PMC204975  PMID: 8349549

Abstract

The polymerase chain reaction (PCR) was used to detect large tRNA gene clusters in Bacillus subtilis, Bacillus badius, Bacillus megaterium, Lactobacillus brevis, Lactobacillus casei, and Staphylococcus aureus. The primers were based on conserved sequences of known gram-positive bacterial tRNA(Arg) and tRNA(Phe) genes. This PCR procedure detected an unusually large tRNA gene cluster in S. aureus. PCR-generated probes were used to identify a 4.5-kb EcoRI fragment that contained 27 tRNA genes immediately 3' to an rRNA operon. Some of these 27 tRNA genes are very similar, but only 1 is exactly repeated in the cluster. The 5' end of this cluster has a gene order similar to that found in the 9- and 21-tRNA gene clusters of B. subtilis. The 3' end of this S. aureus cluster exhibits more similarity to the 16-tRNA gene cluster of B. subtilis. The 24th, 25th, and 26th tRNA genes of this S. aureus tRNA gene cluster code for three similar, unusual Gly-tRNAs that may be used in the synthesis of the peptidoglycan in the cell wall but not in protein synthesis. Southern analysis of restriction digests of S. aureus DNA indicate that there are five to six rRNA operons in this bacterium's genome and that most or all may have large tRNA gene clusters at the 3' end.

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Selected References

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