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Information on EC 4.3.1.3 - histidine ammonia-lyase

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EC Tree
     4 Lyases
         4.3 Carbon-nitrogen lyases
             4.3.1 Ammonia-lyases
                4.3.1.3 histidine ammonia-lyase
IUBMB Comments
This enzyme is a member of the aromatic amino acid lyase family, other members of which are EC 4.3.1.23 (tyrosine ammonia-lyase), EC 4.3.1.24 (phenylalanine ammonia-lyase) and EC 4.3.1.25 (phenylalanine/tyrosine ammonia-lyase). The enzyme contains the cofactor 3,5-dihydro-5-methylidene-4H-imidazol-4-one (MIO), which is common to this family . This unique cofactor is formed autocatalytically by cyclization and dehydration of the three amino-acid residues alanine, serine and glycine . This enzyme catalyses the first step in the degradation of histidine and the product, urocanic acid, is further metabolized to glutamate [2,3].
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Reaction Schemes
Synonyms
hal, histidase, histidine ammonia lyase, histidinase, l-histidase, more
REACTION
REACTION DIAGRAM
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ORGANISM
UNIPROT
LITERATURE
L-histidine = urocanate + NH3
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