1.5.1.1 L-pipecolate + NAD(P)+ = 1-piperideine-2-carboxylate + NAD(P)H + H+ (1) - 1.5.1.1 L-pipecolate + NAD(P)+ = 1-piperideine-2-carboxylate + NAD(P)H + H+ (1) proposed catalytic mechanism of ketimine reductase 743355 1.5.1.1 L-proline + NAD(P)+ = 1-pyrroline-2-carboxylate + NAD(P)H + H+ (2) - 1.5.1.1 L-proline + NAD(P)+ = 1-pyrroline-2-carboxylate + NAD(P)H + H+ (2) proposed catalytic mechanism of ketimine reductase 743355 1.5.1.1 L-proline + NAD(P)+ = 1-pyrroline-2-carboxylate + NAD(P)H + H+ Mobile domains I and II of protein change their conformations to produce the catalytic form. Preference for NADPH over NADH is explained by the cofactor binding site architecture 674509