IUBMB Enzyme Nomenclature


Accepted name: 2-aminohexano-6-lactam racemase

Reaction: (S)-2-aminohexano-6-lactam = (R)-2-aminohexano-6-lactam

Glossary: (S)-2-aminohexano-6-lactam = L-lysine 1,6-lactam

Other name(s): α-amino-ε-caprolactam racemase

Systematic name: 2-aminohexano-6-lactam racemase

Comments: Contains pyridoxal 5'-phosphate. Also racemises 2-aminopentano-5-lactam (α-amino-δ-valerolactam) and 2-amino-4-thiahexano-6-lactam (where S replaces CH2 of C-4). It does not catalyse the racemisation of α-amino acids but has some transaminase activity with them.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 52652-64-9


1. Ahmed, S.A., Esaki, N., Tanaka, H., Soda, K. L-α-Amino-β-thio-ε-caprolactam, a new sulfur-containing substrate for α-amino-ε-caprolactam racemase. FEBS Lett. 174 (1984) 76-79.

2. Ahmed, S.A., Esaki, N., Tanaka, H., Soda, K. Mechanism of α-amino-ε-caprolactam racemase reaction. Biochemistry 25 (1986) 385-388. [PMID: 3955003]

3. Okazaki, S., Suzuki, A., Mizushima, T., Kawano, T., Komeda, H., Asano, Y. and Yamane, T. The novel structure of a pyridoxal 5'-phosphate-dependent fold-type I racemase, α-amino-ε-caprolactam racemase from Achromobacter obae. Biochemistry 48 (2009) 941–950. [PMID: 19146406]

[EC created 1999]

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