ExplorEnz: EC 4.3.1.12

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4.3.1.12

Accepted name:

ornithine cyclodeaminase

Reaction:

L-ornithine = L-proline + NH₃

For diagram of proline biosynthesis, click here and for diagram of the postulated mechanism, click here

Other name(s):

ornithine cyclase; ornithine cyclase (deaminating); L-ornithine ammonia-lyase (cyclizing)

Systematic name:

L-ornithine ammonia-lyase (cyclizing; L-proline-forming)

Comments:

Requires NAD⁺. The enzyme is a member of the μ-crystallin protein family [4]. The reaction is stimulated by the presence of ADP or ATP and is inhibited by O₂ [2].

Links to other databases:

BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB, CAS registry number: 9054-76-6

References:

1.	Costilow, R.N. and Laycock, L. Ornithine cyclase (deaminating). Purification of a protein that converts ornithine to proline and definition of the optimal assay conditions. J. Biol. Chem. 246 (1971) 6655–6660. [PMID: 4399881]
2.	Muth, W.L. and Costilow, R.N. Ornithine cyclase (deaminating). II. Properties of the homogeneous enzyme. J. Biol. Chem. 249 (1974) 7457–7462. [PMID: 4373469]
3.	Espineda, C.E., Linford, A.S., Devine, D. and Brusslan, J.A. The AtCAO gene, encoding chlorophyll a oxygenase, is required for chlorophyll b synthesis in Arabidopsis thaliana. Proc. Natl. Acad. Sci. USA 96 (1999) 10507–10511. [DOI] [PMID: 10468639]
4.	Goodman, J.L., Wang, S., Alam, S., Ruzicka, F.J., Frey, P.A. and Wedekind, J.E. Ornithine cyclodeaminase: structure, mechanism of action, and implications for the μ-crystallin family. Biochemistry 43 (2004) 13883–13891. [DOI] [PMID: 15518536]
5.	Alam, S., Wang, S.C., Ruzicka, F.J., Frey, P.A. and Wedekind, J.E. Crystallization and X-ray diffraction analysis of ornithine cyclodeaminase from Pseudomonas putida. Acta Crystallogr. D Biol. Crystallogr. 60 (2004) 941–944. [DOI] [PMID: 15103146]

[EC 4.3.1.12 created 1976]