L-aspartate oxidase;
NadB;
Laspo;
AO

Oxidoreductases;
Acting on the CH-NH2 group of donors;
With oxygen as acceptor

L-aspartate:oxygen oxidoreductase

L-aspartate + O2 = iminosuccinate + H2O2 [RN:R00481]

R00481;
(other) R00357

L-aspartate [CPD:C00049];
O2 [CPD:C00007]

A flavoprotein (FAD). L-Aspartate oxidase catalyses the first step in the de novo biosynthesis of NAD+ in some bacteria. O2 can be replaced by fumarate as electron acceptor, yielding succinate [5]. The ability of the enzyme to use both O2 and fumarate in cofactor reoxidation enables it to function under both aerobic and anaerobic conditions [5]. Iminosuccinate can either be hydrolysed to form oxaloacetate and NH3 or can be used by EC 2.5.1.72, quinolinate synthase, in the production of quinolinate. The enzyme is a member of the succinate dehydrogenase/fumarate-reductase family of enzymes [5].