ribulose bisphosphate

(noun)

an organic substance that is involved in photosynthesis, reacts with carbon dioxide to form 3-PGA

Related Terms

  • light-independent reaction
  • rubisco

Examples of ribulose bisphosphate in the following topics:

  • The Calvin Cycle

    • In the stroma, in addition to CO2,two other components are present to initiate the light-independent reactions: an enzyme called ribulose bisphosphate carboxylase (RuBisCO) and three molecules of ribulose bisphosphate (RuBP).
  • The Energy-Requiring Steps of Glycolysis

    • A second ATP molecule donates a high-energy phosphate to fructose-6-phosphate, producing fructose-1,6-bisphosphate.
    • The newly-added high-energy phosphates further destabilize fructose-1,6-bisphosphate.
    • The fourth step in glycolysis employs an enzyme, aldolase, to cleave 1,6-bisphosphate into two three-carbon isomers: dihydroxyacetone-phosphate and glyceraldehyde-3-phosphate.
  • Control of Catabolic Pathways

    • The enzyme's activity is increased when fructose-1,6-bisphosphate levels increase.
    • (Recall that fructose-1,6-bisphosphate is an intermediate in the first half of glycolysis. ) The regulation of pyruvate kinase involves phosphorylation, resulting in a less-active enzyme.
  • Methods of Intracellular Signaling

    • Enzymes known as kinases phosphorylate PI to form PI-phosphate (PIP) and PI-bisphosphate (PIP2).
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