Merck, A7189-500UN, L-Alanine Dehydrogenase from Bacillus subtilis

General description
L-Alanine Dehydrogenase has a N-terminal substrate-binding domain and a C-terminal NAD-binding domain.
Application
L-Alanine Dehydrogenase from Bacillus subtilis has been used in the carbon nanotube columns for H2-driven biocatalysis hydrogenation studies.
L-Alanine dehydrogenase converts L-alanine to pyruvate and ammonium. L-Alanine dehydrogenase from Bacillus subtilis may be used to study enzyme inactivation and protection .
Biochem/physiol Actions
L-Alanine Dehydrogenase is essential for sporulation in Bacillus subtilis.
L-Alanine dehydrogenase is a stereospecific dehydrogenase that catalyzes the reversible deamination of L-alanine to pyruvate and ammonium. It is important for the generation of pyruvate during sporulation. L-Alanine dehydrogenase from Bacillus subtilis has a predominately ordered kinetic mechanism in which NAD binds before L-alanine. Subsequently, ammonia, pyruvate and NADH are released in that specific order. Optimal pH for the amination reaction is 8.8-9.0, whereas it is 10-10.5 for the deamination reaction. The enzyme is inactivated by divalent metal ions and p-chloromercuribenzoate, mercuric ion being most effective. The inactivation may be reversed by L- or D-cysteine.
Physical form
Suspension in 2.4 M (NH₄)₂SO₄ solution, pH 7.0
Other Notes
One unit will convert 1.0 μmole of L-alanine to pyruvate and NH₃ per min at pH 10.0 at 25 °C.