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Pubmed ID :1608947
Publication Date : //

Adenylosuccinate lyase of Bacillus subtilis regulates the activity of the glutamyl-tRNA synthetase.


In Bacillus subtilis, the glutamyl-tRNA synthetase [L-glutamate:tRNA(Glu) ligase (AMP-forming), EC 6.1.1.17] is copurified with a polypeptide of M(r) 46,000 that influences its affinity for its substrates and increases its thermostability. The gene encoding this regulatory factor was cloned with the aid of a 41-mer oligonucleotide probe corresponding to the amino acid sequence of an NH2-terminal segment of this factor. The nucleotide sequence of this gene and the physical map of the 1475-base-pair fragment on which it was cloned are identical to those of purB, which encodes the adenylosuccinate lyase (adenylosuccinate AMP-lyase, EC 4.3.2.2), an enzyme involved in the de novo synthesis of purines. This gene complements the purB mutation of Escherichia coli JK268, and its presence on a multicopy plasmid behind the trc promoter in the purB- strain gives an adenylosuccinate lyase level comparable to that in wild-type B. subtilis. A complex between the adenylosuccinate lyase and the glutamyl-tRNA synthetase was detected by centrifugation on a density gradient. The interaction between these enzymes may play a role in the coordination of purine metabolism and protein biosynthesis.

Authors : Gendron N , Breton R , Champagne N , Lapointe J ,

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