Phosphoribulokinase (PRK) 2.7.1.19 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 [1]. 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.

Uridine kinase (pyrimidine ribonucleoside kinase) is the rate-limiting enzyme in the pyrimidinesalvage pathway. It catalyzes the following reaction:ATP + Uridine = ADP + UMP

Pantothenate kinase (2.7.1.33) catalyzes the rate-limiting step in the biosynthesis of coenzyme A, the conversion of pantothenate to D-4'-phosphopantothenate in the presence of ATP.

1. The form II fructose 1,6-bisphosphatase and phosphoribulokinase genes form part of a large operon in Rhodobacter sphaeroides: primary structure and insertional mutagenesis analysis. Biochemistry 29, 8085-93

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