2-oxobutanoate + L-histidine <=> 3-(imidazol-5-yl)pyruvate + (2S)-2-aminobutanoate
2-oxobutanoate + l-histidine <=> 3-(imidazol-5-yl)pyruvate + (2s)-2-aminobutanoate
2-oxobutanoate + L-histidine <=> 3-(imidazol-5-yl)pyruvate + (2S)-2-aminobutanoate
2-oxobutanoate + l-histidine <=> 3-(imidazol-5-yl)pyruvate + (2s)-2-aminobutanoate