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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Molecular cloning and primary structure of cDNA encoding the catalytic domain of rat liver aspartyl-tRNA synthetase.

A cDNA clone encoding rat liver aspartyl-tRNA synthetase was isolated by probing a lambda gt11 recombinant cDNA expression library with antibodies directed against the corresponding polypeptide from sheep liver. The 1930-base pairs-long cDNA insert allowed the expression in Escherichia coli of an active enzyme of mammalian origin. The nucleotide sequence of that cDNA, corresponding to the DRS1 gene, was determined. The open reading frame of DRS1 corresponds to a protein of Mr = 57,061, in good agreement with the previously determined molecular weight of the purified enzyme. The deduced amino acid sequence shows extensive homologies with that of yeast cytoplasmic aspartyl-tRNA synthetase, more than 50% of the residues being identical. In rat liver, aspartyl-tRNA synthetase occurs in two distinct forms: a dimeric enzyme and a component of a multienzyme complex comprising the nine aminoacyl-tRNA synthetases specific for arginine, aspartic acid, glutamic acid, glutamine, isoleucine, leucine, lysine, methionine, and proline. The primary structure of the DRS1 gene product is discussed in relation to the occurrence of two distinct forms of that enzyme.[1]

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