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. 1989 Dec;171(12):6446–6454. doi: 10.1128/jb.171.12.6446-6454.1989

Evolution of a tRNA operon in gamma purple bacteria.

S Giroux 1, R Cedergren 1
PMCID: PMC210533  PMID: 2687235

Abstract

Genomic DNA from eubacteria belonging to the gamma-3 subdivision of purple bacteria, as classified by Woese (C.R. Woese, Microbiol. Rev. 51:221-271, 1987), were probed with the argT operon of Escherichia coli encoding 5'-tRNA(Arg)-tRNA(His)-tRNA(Leu)-tRNA(Pro)-3'. The homologous operon from Vibrio harveyi was isolated and sequenced. Comparison of the five available sequences of this tRNA cluster from members of the families Enterobacteriaceae, Aeromonadaceae, and Vibrionaceae led to the conclusion that variations in different versions of this operon arose not only by point mutations but also by duplication and addition-deletion of entire tRNA genes. This data base permitted the formulation of a proposal dealing with the evolutionary history of this operon and suggested that DNA regions containing tRNA genes are active centers (hot spots) of recombination. Finally, since the operon from V. harveyi was not highly repetitive and did not contain tRNA pseudogenes, as in the Photobacterium phosphoreum operon, hybridization of genomic DNAs from different photobacterial strains with probes specific for the repeated pseudogene element was performed. We conclude that the phylogenetic distribution of the repetitive DNA is restricted to strains of P. phosphoreum.

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Selected References

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