ExplorEnz: EC 5.5.1.7

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5.5.1.7

Accepted name:

chloromuconate cycloisomerase

Reaction:

(2R)-2-chloro-2,5-dihydro-5-oxofuran-2-acetate = 3-chloro-cis,cis-muconate

For diagram of reaction, click here

Glossary:

(2R)-2-chloro-2,5-dihydro-5-oxofuran-2-acetate = (+)-4-chloromuconolactone
3-chloro-cis,cis-muconate = (2E,4Z)-3-chlorohexa-2,4-dienedioate

Other name(s):

muconate cycloisomerase II; 2-chloro-2,5-dihydro-5-oxofuran-2-acetate lyase (decyclizing); 2-chloro-2,5-dihydro-5-oxofuran-2-acetate lyase (ring-opening)

Systematic name:

(2R)-2-chloro-2,5-dihydro-5-oxofuran-2-acetate lyase (ring-opening)

Comments:

Requires Mn²⁺. The product of cycloisomerization of 3-chloro-cis,cis-muconate spontaneously eliminates chloride to produce cis-4-carboxymethylenebut-2-en-4-olide. Also acts on 2-chloro-cis,cis-muconate. Not identical with EC 5.5.1.1 (muconate cycloisomerase) or EC 5.5.1.11 (dichloromuconate cycloisomerase).

Links to other databases:

BRENDA, EAWAG-BBD, EXPASY, Gene, KEGG, MetaCyc, PDB, CAS registry number: 95990-33-3

References:

1.	Schmidt, E. and Knackmuss, H.-J. Chemical structure and biodegradability of halogenated aromatic compounds. Conversion of chlorinated muconic acids into maleoylacetic acid. Biochem. J. 192 (1980) 339–347. [PMID: 7305906]
2.	Kaulmann, U., Kaschabek, S.R. and Schlomann, M. Mechanism of chloride elimination from 3-chloro- and 2,4-dichloro-cis,cis-muconate: new insight obtained from analysis of muconate cycloisomerase variant CatB-K169A. J. Bacteriol. 183 (2001) 4551–4561. [DOI] [PMID: 11443090]
3.	Kajander, T., Lehtio, L., Schlomann, M. and Goldman, A. The structure of Pseudomonas P51 Cl-muconate lactonizing enzyme: co-evolution of structure and dynamics with the dehalogenation function. Protein Sci. 12 (2003) 1855–1864. [DOI] [PMID: 12930985]

[EC 5.5.1.7 created 1983]