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Nucleic Acids Res. 1990 Dec 11;18(23):7109-18.

Aspartyl-tRNA synthetase from Escherichia coli: cloning and characterisation of the gene, homologies of its translated amino acid sequence with asparaginyl- and lysyl-tRNA synthetases.

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  • 1Institut de Biologie Mol├ęculaire et Cellulaire du CNRS, Strasbourg, France.

Abstract

By screening of an Escherichia coli plasmidic library using antibodies against aspartyl-tRNA synthetase (AspRS) several clones were obtained containing aspS, the gene coding for AspRS. We report here the nucleotide sequence of aspS and the corresponding primary structure of the aspartyl-tRNA synthetase, a protein of 590 amino acid residues with a Mr 65,913, a value in close agreement with that observed for the purified protein. Primer extension analysis of the aspS mRNA using reverse transcriptase located its 5'-end at 94 nucleotides upstream of the translation initiation AUG; nuclease S1 analysis located the 3'-end at 126 nucleotides downstream of the stop codon UGA. Comparison of the DNA-derived protein sequence with known aminoacyl-tRNA sequences revealed important homologies with asparaginyl- and lysyl-tRNA synthetases from E.coli; more than 25% of their amino acid residues are identical, the homologies being distributed preferencially in the first part and the carboxy-terminal end of the molecule. Mutagenesis directed towards a consensus tetrapeptide (Gly-Leu-Asp-Arg) and the carboxy-terminal end showed that both domains could be implicated in catalysis as well as in ATP binding.

PMID:
2129559
[PubMed - indexed for MEDLINE]
PMCID:
PMC332776
Free PMC Article
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