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Information on EC - aspartate-tRNAAsn ligase

for references in articles please use BRENDA:EC6.1.1.23
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IUBMB Comments
When this enzyme acts on tRNAAsp, it catalyses the same reaction as EC, aspartate---tRNA ligase. It has, however, diminished discrimination, so that it can also form aspartyl-tRNAAsn. This relaxation of specificity has been found to result from the absence of a loop in the tRNA that specifically recognizes the third position of the anticodon . This accounts for the ability of this enzyme in, for example, Thermus thermophilus, to recognize both tRNAAsp (GUC anticodon) and tRNAAsn (GUU anticodon). The aspartyl-tRNAAsn is not used in protein synthesis until it is converted by EC, asparaginyl-tRNA synthase (glutamine-hydrolysing), into asparaginyl-tRNAAsn.
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The expected taxonomic range for this enzyme is: Bacteria, Eukaryota, Archaea
nd-asprs, nondiscriminating aspartyl-trna synthetase, aspartyl trna synthetase, nondiscriminating asprs, aspartate trna synthetase, more
ATP + L-aspartate + tRNAAsx = AMP + diphosphate + L-aspartyl-tRNAAsx
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