What is "phosphoribulokinase"

n. (context enzyme English) A phosphotransferase that acts on ribulose phosphate

In enzymology, a phosphoribulokinase is an enzyme that catalyzes the chemical reaction

ATP + D-ribulose 5-phosphate $\rightleftharpoons$ ADP + D-ribulose 1,5-bisphosphate

Thus, the two substrates of this enzyme are ATP and D-ribulose 5-phosphate, whereas its two products are ADP and D-ribulose 1,5-bisphosphate.

This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups ( phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:D-ribulose-5-phosphate 1-phosphotransferase. Other names in common use include phosphopentokinase, ribulose-5-phosphate kinase, phosphopentokinase, phosphoribulokinase (phosphorylating), 5-phosphoribulose kinase, ribulose phosphate kinase, PKK, PRuK, and PRK. This enzyme participates in carbon fixation.