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A9253 Sigma

L-Amino Acid Oxidase from Crotalus adamanteus

Type I, dried venom, ≥0.3 unit/mg solid

Synonym: L-AAO, L-Amino acid: oxygen oxidoreductase (deaminating)



Related Categories 1.4.x.x Acting on CH-NH2, 1.x.x.x Oxidoreductases, Amino Acid Metabolism, Biochemicals and Reagents, Cell Biology,
type   Type I
form   dried venom
solubility   H2O: soluble 1.0 mg/mL clear(lit.)
storage temp.   −20°C


Preparation Note

Dissolves in water at 1 mg/mL concentration to form a clear solution.

Unit Definition

One unit will oxidatively deaminate 1.0 μmole of L-phenylalanine per min at pH 6.5 at 37 °C. (L-Leucine is deaminated at the same rate at pH 7.8 at 37 °C.)


L-amino acid oxidase (LAAO) is used to convert L-amino acids to their corresponding α-keto acids. One unit will oxidatively deaminate 1.0 μmole of L-phenylalanine per min at pH 6.5 at 37 °C. L-amino acid oxidase, from Sigma, has been used in leucine aminopeptidase (LAP) activity assays. The enzyme has been immobilized and used in an enzymatic flow-injection procedure with chemiluminescence detection for on-site determination of L-alanine.

Biochem/physiol Actions

L-Amino acid oxidase is a flavoprotein with a molecular weight of 130 kDa. It consists of two different subunits of approximately 70,000 Da. Each molecule of holoenzyme has two FAD molecules. It is a glycoprotein containing about 2-5% carbohydrate, including sialic acid. Optimum pH is approximately 7.5. It occurs in many snake venoms apart from microorganisms and animal tissue, especially in kidney and liver. The enzyme may be reversibly inactivated by incubation in phosphate buffer, pH 7.5 at 38 °C. L-amino acid oxidase is involved in various metabolic pathways such as alanine and aspartate metabolism, methionine metabolism, valine, leucine and isoleucine degradation, tyrosine metabolism, phenylalanine metabolism, tryptophan metabolism, phenylalanine, tyrosine and tryptophan biosynthesis, and alkaloid biosynthesis.

Price and Availability

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Biomedical Applications
Safety & Documentation

Safety Information

GHS06  GHS06
Signal word 
Hazard statements 
Precautionary statements 
UN 3462 6.1 / PGI
WGK Germany 
Protocols & Articles

Related Content

Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

Peer-Reviewed Papers


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