Reaction: CTP + (R)-4'-phosphopantothenate + L-cysteine = CMP + diphosphate + N-[(R)-4'-phosphopantothenoyl]-L-cysteine
For diagram of reaction click here.
Other name(s): phosphopantothenoylcysteine synthetase; phosphopantothenate—cysteine ligase
Systematic name: (R)-4'-phosphopantothenate:L-cysteine ligase
Comments: A key enzyme in the production of coenzyme A. The bacterial enzyme requires CTP, in contrast to the eukaryotic enzyme, EC 6.3.2.51, which requires ATP. Cysteine can be replaced by some of its derivatives.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9023-50-1
References:
1. Brown, G.M. The metabolism of pantothenic acid. J. Biol. Chem. 234 (1959) 370-378. [PMID: 13630913]
2. Strauss, E., Kinsland, C., Ge, Y., McLafferty, F.W. and Begley, T.P. Phosphopantothenoylcysteine synthetase from Escherichia coli. Identification and characterization of the last unidentified Coenzyme A biosynthetic enzymes in bacteria. J. Biol. Chem. 276 (2001) 13513-13516. [PMID: 11278255]
3. Kupke, T. Molecular characterization of the 4'-phosphopantothenoylcysteine synthetase domain of bacterial Dfp flavoproteins. J. Biol. Chem. 277 (2002) 36137-36145. [PMID: 12140293]