Tags: Enzyme.
In enzymology a phosphopantothenate-cysteine ligase also known as phosphopantothenoylcysteine synthetase (PPCS) is an enzyme that catalyzes the chemical reaction which constitutes the second of five steps involved in the conversion of pantothenate to Coenzyme A. The reaction is:NTP + (R)-4′-phosphopantothenate + L-cysteine NMP + diphosphate + N-[(R)-4′-phosphopantothenoyl]-L-cysteineThe nucleoside triphosphate (NTP) involved in the reaction varies from species to species.