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Pubmed ID :10383414
Publication Date : //

Functional characterization of the D-Tyr-tRNATyr deacylase from Escherichia coli.


The yihZ gene of Escherichia coli is shown to produce a deacylase activity capable of recycling misaminoacylated D-Tyr-tRNATyr. The reaction is specific and, under optimal in vitro conditions, proceeds at a rate of 6 s-1 with a Km value for the substrate equal to 1 microM. Cell growth is sensitive to interruption of the yihZ gene if D-tyrosine is added to minimal culture medium. Toxicity of exogenous D-tyrosine is exacerbated if, in addition to the disruption of yihZ, the gene of D-amino acid dehydrogenase (dadA) is also inactivated. Orthologs of the yihZ gene occur in many, but not all, bacteria. In support of the idea of a general role of the D-Tyr-tRNATyr deacylase function in the detoxification of cells, similar genes can be recognized in Saccharomyces cerevisiae, Caenorhabditis elegans, Arabidopsis thaliana, mouse, and man.

Authors : Soutourina J , Plateau P , Delort F , Peirotes A , Blanquet S ,

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