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pubmed-article:8319804pubmed:abstractTextThe genes of aspartyl-tRNA synthetase (AspRS) from two Thermus thermophilus strain VK-1 and HB8, have been cloned and sequenced. Their nucleotidic sequences code for the same protein which displays the three characteristic motifs of class II aminoacyl-tRNA synthetases. This enzyme shows 50% identity with Escherichia coli AspRS, over the totality of the chain (580 amino acids). A comparison with the eukaryotic yeast cytoplasmic AspRS indicates the presence in the prokaryotic AspRS of an extra domain between motifs 2 and 3 much larger than in the eukaryotic ones. When its gene is under the control of the tac promoter of the expression vector pKK223-3, the protein is efficiently overexpressed as a thermostable protein in E. coli. It can be further purified to homogeneity using a heat treatment followed by a single anion exchange chromatography. Single crystals of the pure protein, diffracting at least to 2.2 A resolution (space group P2(1)2(1)2(1), a = 61.4 A, b = 156.1 A, c = 177.3 A) are routinely obtained. The same crystals have previously been described as crystals of threonyl-tRNA synthetase [1].lld:pubmed
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pubmed-article:8319804pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:8319804pubmed:articleTitleSequence, overproduction and crystallization of aspartyl-tRNA synthetase from Thermus thermophilus. Implications for the structure of prokaryotic aspartyl-tRNA synthetases.lld:pubmed
pubmed-article:8319804pubmed:affiliationLaboratoire de Biochimie, URA 240 CNRS, Ecole Polytechnique, Palaiseau, France.lld:pubmed
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