Probable histidine--tRNA ligase, mitochondrial
Carnosine + Water → L-Histidine + β-Alanine
L-Histidine ↔ Ammonia + Urocanic acid
Anserine + Water → 1-Methylhistidine + β-Alanine
1-Methylhistidine + Adenosine triphosphate + β-Alanine → Adenosine diphosphate + Anserine + Phosphate
Carnosine + S-Adenosylmethionine → Anserine + S-Adenosylhomocysteine
Histamine + Oxygen + Water → Ammonia + Hydrogen peroxide + Imidazole-4-acetaldehyde
Adenosine triphosphate + L-Histidine + tRNA(His) → Adenosine monophosphate + L-Histidyl-tRNA(His) + Pyrophosphate
Formiminoglutamic acid + Tetrahydrofolic acid ↔ 5-Formiminotetrahydrofolic acid + L-Glutamic acid
4-Imidazolone-5-propionic acid + Water → Formiminoglutamic acid
4-Imidazolone-5-propionic acid ↔ Urocanic acid + Water
Imidazole-4-acetaldehyde + NAD + Water → Hydrogen Ion + Imidazoleacetic acid + NADH
Methylimidazole acetaldehyde + NADP + Water → Hydrogen Ion + Methylimidazoleacetic acid + NADPH
1-Methylhistamine + Oxygen + Water → Ammonia + Hydrogen peroxide + Methylimidazole acetaldehyde
Histamine + S-Adenosylmethionine → 1-Methylhistamine + S-Adenosylhomocysteine
L-Histidine → Carbon dioxide + Histamine
L-Histidine + S-Adenosylmethionine → 3-Methylhistidine + S-Adenosylhomocysteine
Adenosine triphosphate + L-Histidine + β-Alanine → Adenosine diphosphate + Carnosine + Phosphate
Aldehyde dehydrogenase family 3 member B1
Amiloride-sensitive amine oxidase [copper-containing]