Reaction: 4-carboxybut-2-enoyl-CoA = but-2-enoyl-CoA + CO2
Glossary: glutaconyl-CoA = 4-carboxybut-2-enoyl-CoA
Other name(s): glutaconyl coenzyme A decarboxylase; pent-2-enoyl-CoA carboxy-lyase; 4-carboxybut-2-enoyl-CoA carboxy-lyase
Systematic name: 4-carboxybut-2-enoyl-CoA carboxy-lyase (but-2-enoyl-CoA-forming)
Comments: The enzyme from Acidaminococcus fermentans is a biotinyl-protein, requires Na+, and acts as a sodium pump. Prior to the Na+-dependent decarboxylation, the carboxylate is transferred to biotin in a Na+-independent manner. The conserved lysine, to which biotin forms an amide bond, is located 34 amino acids before the C-terminus, flanked on both sides by two methionine residues, which are conserved in every biotin-dependent enzyme.
Links to other databases: BRENDA, EXPASY, KEGG, UM-BBD, Metacyc, PDB, UM-BBD, CAS registry number: 84399-93-9
1. Buckel, W.S. and Semmler, R. Purification, characterisation and reconstitution of glutaconyl-CoA decarboxylase, a biotin-dependent sodium pump from anaerobic bacteria. Eur. J. Biochem. 136 (1983) 427-434. [PMID: 6628393]
2. Buckel, W. Sodium ion-translocating decarboxylases. Biochim. Biophys. Acta 1505 (2001) 15-27. [PMID: 11248185]