label: (2S)-2-amino-4-{[(1S)-1-carboxy-2-(1H-imidazol-4-yl)ethyl]amino}butanoate + S-methyl-5'-thioadenosine + H(+) => L-histidine + S-adenosyl-L-methionine
label_lc: (2s)-2-amino-4-{[(1s)-1-carboxy-2-(1h-imidazol-4-yl)ethyl]amino}butanoate + s-methyl-5'-thioadenosine + h(+) => l-histidine + s-adenosyl-l-methionine