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D-Ribulose 1,5-Diphosphate Carboxylase from spinach

partially purified powder, 0.01-0.1 unit/mg solid

3-Phospho-D-glycerate carboxy-lyase(dimerizing), Rubisco
CAS Number:
Enzyme Commission number:
MDL number:

biological source


Quality Level


partially purified powder

specific activity

0.01-0.1 unit/mg solid

mol wt

557 kDa

storage temp.


General description

D-Ribulose 1,5-Diphosphate Carboxylase (RUBISCO) amounts to 50% of the total spinach leaves associated soluble protein.[23]
Exists as a 557 kDa hexadecamer composed of eight heavy chains each with a molecular weight of approximately 56 kDa and eight light chains of molecular weight 14 kDa. Each molecule contains one magnesium ion.
pH optimum: ~7.9.
KM for CO2: ~0.45 mM.
Ribulose diphosphate becomes inhibitory at concentrations exceeding 0.7 mM. Orthophosphate and ammonium sulfate are competitive inhibitors. 3-Phosphoglycerate is a noncompetitive inhibitor.


D-Ribulose 1,5-Diphosphate Carboxylase from spinach has been used:
  • as a test protein in pepsin digestion studies
  • as an innocuous or non-hazardous protein sample to test its effect on human intestinal epithelial cell lines
  • [76]
  • in isothermal titration calorimetry (ITC), and radiolabeled binding assays with abscisic acid
  • [70]


    1 unit in poly bottle
    5 units in poly bottle

    Biochem/physiol Actions

    D-Ribulose 1,5-Diphosphate Carboxylase (RUBISCO) depends on Rubisco activase and chaperones for activation.[88] It participates in plant photorespiration events by catalyzing the carboxylation and oxygenation of ribulose-1,5-bisphosphate.[23] Abscisic acid inhibits the carboxylation activity of Rubisco.[70]

    Unit Definition

    One unit will convert 1.0 μmole of D-RuDP and CO2 to 2.0 μmoles of D-3-phosphoglycerate per min at pH 7.8 at 25°C.

    Storage Class Code

    13 - Non Combustible Solids


    WGK 3

    Flash Point(F)

    Not applicable

    Flash Point(C)

    Not applicable

    Personal Protective Equipment

    dust mask type N95 (US), Eyeshields, Gloves

    Certificate of Analysis

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    Certificate of Origin

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