Cysteinyl-tRNA Synthetase

In enzymology, a cysteine-tRNA ligase is an enzyme that catalyzes the chemical reaction: ATP + L-cysteine + tRNACys ⇌  AMP + diphosphate + L-cysteinyl-tRNACys. The 3 substrates of this enzyme are ATP, L-cysteine, and tRNA(Cys), whereas its 3 products are AMP, diphosphate, and L-cysteinyl-tRNA(Cys). This enzyme belongs to the family of ligases, to be specific those forming carbon-oxygen bonds in aminoacyl-tRNA and related compounds. The systematic name of this enzyme class is L-cysteine:tRNACys ligase (AMP-forming). Other names in common use include cysteinyl-tRNA synthetase, cysteinyl-transferRNA synthetase, cysteinyl-transfer ribonucleate synthetase, and cysteine translase. This enzyme participates in cysteine metabolism and aminoacyl-trna biosynthesis.

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