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Information on EC - tyrosine ammonia-lyase

for references in articles please use BRENDA:EC4.3.1.23
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EC Tree
     4 Lyases
         4.3 Carbon-nitrogen lyases
             4.3.1 Ammonia-lyases
       tyrosine ammonia-lyase
IUBMB Comments
This enzyme is a member of the aromatic amino acid lyase family, other members of which are EC (histidine ammonia-lyase), EC (phenylalanine ammonia-lyase) and EC (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 . The enzyme is far more active with tyrosine than with phenylalanine as substrate, but the substrate specificity can be switched by mutation of a single amino acid (H89F) in the enzyme from the bacterium Rhodobacter sphaeroides [1,2].
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
rsTAL, TAL, tyrosine ammonia lyase, tyrosine ammonia-lyase, more
L-tyrosine = trans-p-hydroxycinnamate + NH3
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