IUBMB Enzyme Nomenclature


Accepted name: (carboxyethyl)arginine β-lactam-synthase

Reaction: ATP + L-N2-(2-carboxyethyl)arginine = AMP + diphosphate + deoxyamidinoproclavaminate

For diagram click here.

Systematic name: L-N2-(2-carboxyethyl)arginine cyclo-ligase (AMP-forming)

Comments: Forms part of the pathway for the biosythesis of the β-lactamase inhibitor clavulanate in Streptomyces clavuligerus. It has been proposed [3] that L-N2-(2-carboxyethyl)arginine is first converted into an acyl-AMP by reaction with ATP and loss of diphosphate, and that the β-lactam ring is then formed by the intramolecular attack of the β-nitrogen on the activated carboxy group.

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


1. Zhou, J., Kelly, W.L., Bachmann, B.O., Gunsior, M., Townsend, C.A. and Solomon, E.I. Spectroscopic studies of substrate interactions with clavaminate synthase 2, a multifunctional α-KG-dependent non-heme iron enzyme: Correlation with mechanisms and reactivities. J. Am. Chem. Soc. 123 (2001) 7388-7398.

2. Townsend, C.A. New reactions in clavulanic acid biosynthesis. Curr. Opin. Chem. Biol. 6 (2002) 583-589. [PMID: 12413541]

3. Bachmann, B.O., Li, R. and Townsend, C.A. β-Lactam synthetase: a new biosynthetic enzyme. Proc. Natl. Acad. Sci. USA 95 (1998) 9082-9086. [PMID: 9689037]

[EC created 2003]

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