Cysteine transaminase () is an enzyme characterised from rat liver that catalyzes a reversible chemical reaction that interconverts L-cysteine and α-ketoglutaric acid with 3-mercaptopyruvic acid and L-glutamic acid:
This enzyme is a transferase, 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.
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