(2S)-2-Amino-4-{[(1R)-1-carboxy-2-(1H-imidazol-4-yl)ethyl]amino}butanoate; N-[(3S)-3-Amino-3-carboxypropyl]-D-histidine

staphylopine:NADP+ oxidoreductase [(2S)-2-amino-4-{[(1R)-1-carboxy-2-(1H-imidazol-4-yl)ethyl]amino}butanoate]-forming; Staphylopine + NADP+ + H2O <=> (2S)-2-Amino-4-{[(1R)-1-carboxy-2-(1H-imidazol-4-yl)ethyl]amino}butanoate + Pyruvate + NADPH + H+

S-adenosyl-L-methionine:D-histidine N-[(3S)-3-amino-3-carboxypropyl]-transferase; S-Adenosyl-L-methionine + D-Histidine <=> (2S)-2-Amino-4-{[(1R)-1-carboxy-2-(1H-imidazol-4-yl)ethyl]amino}butanoate + 5'-Methylthioadenosine