Alanine transaminase (ALT) is a transaminase enzyme (EC 18.104.22.168). It is also called alanine aminotransferase (ALAT) and was formerly called serum glutamate-pyruvate transaminase (SGPT) or serum glutamic-pyruvic transaminase (SGPT). ALT is found in plasma and in various body tissues, but is most common in the liver. It catalyzes the two parts of the alanine cycle. Serum ALT level, serum AST (aspartate transaminase) level, and their ratio (AST/ALT ratio) are commonly measured clinically as biomarkers for liver health. The tests are part of blood panels.
ALT, Native (Porcine)
Type I, Lyophilized powder containing Citrate and acetate; Type II, ammonium sulfate suspension, Suspension in 1.8 M (NH4)2SO4 solution, pH 6.0.
Enzyme Commission Number
Type II, > 75 units/mg protein
One unit will convert 1.0 μmole of α-ketoglutarate to L-glutamate per min at pH 7.6 at 37°C in the presence of L-alanine.
Protein determined by biuret
Alanine transaminase; ALT; EC 22.214.171.124; alanine aminotransferase; ALAT; glutamic-pyruvic transaminase; glutamic-alanine transaminase; GPT; β-alanine aminotransferase; alanine-α-ketoglutarate aminotransferase; alanine-pyruvate aminotransferase; glutamic acid-pyruvic acid transaminase; glutamic-pyruvic aminotransferase; L-alanine aminotransferase; L-alanine transaminase; L-alanine-α-ketoglutarate aminotransferase; pyruvate transaminase; pyruvate-alanine aminotransferase; pyruvate-glutamate transaminase