Protein Domain : Phosphoribulokinase IPR006082

Type	Family
Description	Phosphoribulokinase (PRK) catalyses the ATP-dependent phosphorylation of ribulose-5-phosphate to ribulose-1,5-phosphate, a key step in the pentose phosphate pathway where carbon dioxide is assimilated by autotrophic organisms [ ]. In general, plant enzymes are light-activated by the thioredoxin/ferredoxin system, while those from photosynthetic bacteria are regulated by a system that has an absolute requirement for NADH. Thioredoxin/ferredoxin regulation is mediated by the reversibleoxidation/reduction of sulphydryl and disulphide groups. In the spinach enzyme ( ) the participating residues are Cys-16 and Cys-55. Sequence analysis shows the first of these cysteines to be present in the ATP-binding site [ ]; neither is found in the bacterial sequences.
Short Name	PRK