Cysteine transaminase

In enzymology, a cysteine transaminase is an enzyme that catalyzes the chemical reaction

L-cysteine + 2-oxoglutarate rightleftharpoons mercaptopyruvate + L-glutamate

Thus, the two substrates of this enzyme are L-cysteine and 2-oxoglutarate, whereas its two products are mercaptopyruvate and L-glutamate.

This enzyme belongs to the family of transferases, specifically the transaminases, which transfer nitrogenous groups. The systematic name of this enzyme class is L-cysteine:2-oxoglutarate aminotransferase. Other names in common use include cysteine aminotransferase, L-cysteine aminotransferase, and CGT. This enzyme participates in cysteine metabolism. It employs one cofactor, pyridoxal phosphate.


  • CHATAGNER F, SAURET-IGNAZI G "[Role of transamination and pyridoxal phosphate in the enzymatic formation of hydrogen sulfide from cysteine by the rat liver under anaerobiosis.]". Bull. Soc. Chim. Biol. 415–28.

External links

The CAS registry number for this enzyme class is .

Gene Ontology (GO) codes

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