An enzyme that, in the presence of ATP, catalyzes the phosphorylation of d-ribulose 5-phosphate to d-ribulose 1,5-bisphosphate and ADP, a reaction of importance in the carbon dioxide fixation cycle of photosynthesis.

Medical dictionary. 2011.

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  • Phosphoribulokinase — In enzymology, a phosphoribulokinase (EC number| is an enzyme that catalyzes the chemical reaction:ATP + D ribulose 5 phosphate ightleftharpoons ADP + D ribulose 1,5 bisphosphateThus, the two substrates of this enzyme are ATP and D… …   Wikipedia

  • Calvin cycle — s or dark reactions.OverviewDuring photosynthesis, light energy is used to generate chemical free energy, stored in glucose. The light independent Calvin cycle, also (misleadingly) known as the dark reaction or dark stage , uses the energy from… …   Wikipedia

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  • photosynthesis — photosynthetic /foh teuh sin thet ik/, adj. photosynthetically, adv. /foh teuh sin theuh sis/, n. Biol., Biochem. (esp. in plants) the synthesis of complex organic materials, esp. carbohydrates, from carbon dioxide, water, and inorganic salts,… …   Universalium

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