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Asparaginyl-tRNA synthetase from Escherichia coli has significant sequence homologies with yeast aspartyl-tRNA synthetase


Asparaginyl-tRNA synthetase from Escherichia coli has significant sequence homologies with yeast aspartyl-tRNA synthetase



Gene 84(2): 481-485



ISSN/ISBN: 0378-1119

PMID: 2693216

DOI: 10.1016/0378-1119(89)90524-6

The Escherichia coli asnS gene codes for asparaginyl-tRNA synthetase (NRSEC). We have sequenced the asnS region, including 382 bp of the 5'-untranslated region, 1398 bp of the coding region and 280 bp of the 3'-untranslated region. The DNA-derived NRSEC amino acid (aa) sequence was confirmed by direct aa sequencing of the N-terminal parts of the native protein and of a 28-kDa internal fragment generated by trypsin digestion. The asnS gene product has been purified to homogeneity using three chromatographic steps. Sequence comparison of the deduced NRSEC sequence with all aminoacyl-tRNA synthetase sequences showed significant homologies with the yeast aspartyl-tRNA synthetase and weaker relationships with other aminoacyl-tRNA synthetases for aa with an XAX codon.

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Accession: 039327780

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