<prompt> Oxidative deamination is catalyzed by -GlutaminaseGlutamine synthaseGlutamate dehydrogenaseNone of the above  <response>: Ans. is c i.e., Glutamate dehydrogenase Deaminationo Deamination i.e., removal of -NH, group may be oxidative or non-oxidative.Oxidative deaminationo It is the most important deamination process. Glutamate undergoes oxidative deamination removal of amino group by the action of L-glutamate dehydrogenase GDH. GDH requires NAD or NADP.o Thus, the net removal of a-amino groups to form ammonia, requires the comination of glutamate transminases AL T or AST and glutamate dehydrogenase. The whole process of conversion of a-amino group to ammonia transamination oxidative deamination is called Transdeamination.Nonoxidative deaminationo Beside oxidative deamination, deamination can also occur by non-oxidative methods,. It occurs by: -i By Amino acid oxidases : L-amino acid oxidases of liver and kidney convert an a-amino acid to a-imino acid that decomposes to an a-keto acid with release of ammonium ion. In this reaction, O, is reduced to H,0., which is later decomposed by catalase.ii By amino acid dehydratase : - The a-amino group of serine and threonine can be directly deaminate into NH4 ion by dehydratases. Dehydratases also requirepyridoxal-phosphate as coenzyme. 