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Information on EC 6.1.1.23 - 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 6.1.1.12, 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 6.3.5.6, asparaginyl-tRNA synthase (glutamine-hydrolysing), into asparaginyl-tRNAAsn.

The enzyme appears in viruses and cellular organisms

Synonyms
nd-asprs, aspartyl trna synthetase, nondiscriminating aspartyl-trna synthetase, nondiscriminating asprs, aspartate trna synthetase, more

REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
ATP + L-aspartate + tRNAAsx = AMP + diphosphate + L-aspartyl-tRNAAsx
show the reaction diagram
PATHWAY SOURCE
PATHWAYS
MetaCyc
L-asparagine biosynthesis III (tRNA-dependent), tRNA charging