glutamate dehydrogenase (NADP+) activity Catalysis of the reaction: L-glutamate + H2O + NADP+ = 2-oxoglutarate + NH3 + NADPH + H+. EC:1.4.1.4 GO:0004354 L-glutamate dehydrogenase L-glutamate:NADP+ oxidoreductase (deaminating) L-glutamic acid dehydrogenase activity MetaCyc:GLUTDEHYD-RXN MetaCyc:GLUTSYNIII-PWY NAD(P)-glutamate dehydrogenase activity NAD(P)H-dependent glutamate dehydrogenase activity RHEA:11615 dehydrogenase, glutamate (nicotinamide adenine dinucleotide (phosphate)) glutamic acid dehydrogenase glutamic dehydrogenase activity molecular_function