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J. Biol. Chem., Vol. 276, Issue 49, 45862-45867, December 7, 2001
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From the Aminoacyl-tRNA is generally formed by
aminoacyl-tRNA synthetases, a family of 20 enzymes essential for
accurate protein synthesis. However, most bacteria generate one of the
two amide aminoacyl-tRNAs, Asn-tRNA or Gln-tRNA, by transamidation of
mischarged Asp-tRNAAsn or Glu-tRNAGln
catalyzed by a heterotrimeric amidotransferase (encoded by the gatA, gatB, and gatC genes). The
Chlamydia trachomatis genome sequence reveals genes for 18 synthetases, whereas those for asparaginyl-tRNA synthetase and
glutaminyl-tRNA synthetase are absent. Yet the genome harbors three
gat genes in an operon-like arrangement
(gatCAB). We reasoned that Chlamydia uses the
gatCAB-encoded amidotransferase to generate both Asn-tRNA
and Gln-tRNA. C. trachomatis aspartyl-tRNA synthetase and
glutamyl-tRNA synthetase were shown to be non-discriminating synthetases that form the misacylated tRNAAsn and
tRNAGln species. A preparation of pure heterotrimeric
recombinant C. trachomatis amidotransferase converted
Asp-tRNAAsn and Glu-tRNAGln into Asn-tRNA and
Gln-tRNA, respectively. The enzyme used glutamine, asparagine, or
ammonia as amide donors in the presence of either ATP or GTP. These
results suggest that C. trachomatis employs the dual
specificity gatCAB-encoded amidotransferase and 18 aminoacyl-tRNA synthetases to create the complete set of 20 aminoacyl-tRNAs.
A Single Amidotransferase Forms Asparaginyl-tRNA and
Glutaminyl-tRNA in Chlamydia trachomatis*
§,
¶,
, and
**
Department of Molecular Biophysics and
Biochemistry and
Chemistry, Yale University,
New Haven, Connecticut 06520-8114
*
Supported by a grant from the NIGMS, National Institutes of
Health.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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