IUBMB Enzyme Nomenclature


Accepted name: phenylalanine aminomutase (L-β-phenylalanine forming)

Reaction: L-phenylalanine = L-β-phenylalanine

Glossary: L-β-phenylalanine = (R)-3-amino-3-phenylpropanoate

Systematic name: L-phenylalanine 2,3-aminomutase [(R)-3-amino-3-phenylpropanoate forming]

Comments: The enzyme contains the cofactor 3,5-dihydro-5-methylidene-4H-imidazol-4-one (MIO). This unique cofactor is formed autocatalytically by cyclization and dehydration of the three amino-acid residues alanine, serine and glycine. cf. EC, phenylalanine aminomutase (D-β-phenylalanine forming).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Feng, L., Wanninayake, U., Strom, S., Geiger, J. and Walker, K.D. Mechanistic, mutational, and structural evaluation of a Taxus phenylalanine aminomutase. Biochemistry 50 (2011) 2919-2930. [PMID: 21361343]

[EC created 2013]

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