(R)-3-amino-2-methylpropionate—pyruvate transaminase

(R)-3-amino-2-methylpropionate—pyruvate transaminase () is an enzyme that catalyzes the chemical reaction

The two substrates of this enzyme characterised from liver are (R)-3-aminoisobutyric acid and pyruvic acid. Its products are methylmalonic acid semialdehyde and L-alanine.

This enzyme is a transferase, specifically a transaminase, which transfer nitrogenous groups. The systematic name of this enzyme class is (R)-3-amino-2-methylpropanoate:pyruvate aminotransferase. Other names in common use include D-3-aminoisobutyrate-pyruvate transaminase, beta-aminoisobutyrate-pyruvate aminotransferase, D-3-aminoisobutyrate-pyruvate aminotransferase, D-3-aminoisobutyrate-pyruvate transaminase, (R)-3-amino-2-methylpropionate transaminase, and D-beta-aminoisobutyrate:pyruvate aminotransferase.

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