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Ribulose 1,5-bisphosphate (RuBP) is an organic substance that is involved in photosynthesis, notably as the principal CO 2 acceptor in plants. [1]: 2 It is a colourless anion, a double phosphate ester of the ketopentose (ketone-containing sugar with five carbon atoms) called ribulose.
Ribulose 5-phosphate can be acted upon by phosphopentose isomerase to form ribose 5-phosphate, which is a precursor for nucleotide and co-factor biosynthesis. [2]
Ribose 5-phosphate (R5P) is both a product and an intermediate of the pentose phosphate pathway. The last step of the oxidative reactions in the pentose phosphate pathway is the production of ribulose 5-phosphate. Depending on the body's state, ribulose 5-phosphate can reversibly isomerize to ribose 5-phosphate.
Ribose-phosphate diphosphokinase transfers the diphosphoryl group from Mg-ATP (Mg 2+ coordinated to ATP) to ribose 5-phosphate. [2] The enzymatic reaction begins with the binding of ribose 5-phosphate, followed by binding of Mg-ATP to the enzyme. In the transition state upon binding of both substrates, the diphosphate is transferred.
Phosphoribulokinase (PRK) (EC 2.7.1.19) is an essential photosynthetic enzyme that catalyzes the ATP-dependent phosphorylation of ribulose 5-phosphate (RuP) into ribulose 1,5-bisphosphate (RuBP), both intermediates in the Calvin Cycle.
Ribulose is a ketopentose — a monosaccharide containing five carbon atoms, and including a ketone functional group.It has chemical formula C 5 H 10 O 5.Two enantiomers are possible, d-ribulose (d-erythro-pentulose) and l-ribulose (l-erythro-pentulose).
In enzymology, a ribose 1,5-bisphosphate phosphokinase (EC 2.7.4.23) is an enzyme that catalyzes the chemical reaction ATP + ribose 1,5-bisphosphate ⇌ {\displaystyle \rightleftharpoons } ADP + 5-phospho-alpha-D-ribose 1-diphosphate
Ribose 1,5-bisphosphate phosphokinase (EC 2.7.4.23), an enzyme that catalyzes the chemical reaction ATP + ribose 1,5-bisphosphate ADP + 5-phospho-alpha-D-ribose 1-diphosphate; Ribulose 1,5-bisphosphate (RuBP), an important substrate involved in carbon fixation