Leucine transaminase () is an enzyme characterised from rat liver that catalyzes a reversible chemical reaction to interconvert L-leucine and α-ketoglutaric acid with α-ketoisocaproic acid and L-glutamic acid:
The enzyme is a transferase, specifically a transaminase, which transfer nitrogenous groups. The systematic name of this enzyme class is L-leucine:2-oxoglutarate aminotransferase. Other names in common use include L-leucine aminotransferase, leucine 2-oxoglutarate transaminase, leucine aminotransferase, and leucine-alpha-ketoglutarate transaminase. It employs one cofactor, pyridoxal phosphate.
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