The properties of a form of ribulose diphosphate carboxylase having a high affinity for CO(2) have been studied. Its apparent Km(HCO(3) (-)) of 0.5 to 0.8 mm (pH 7.8) and calculated Km(CO(2)) of 11 to 18 mum are comparable to the values exhibited by intact chloroplasts during photosynthesis. This
Extraction of maize (Zea mays) leaves by progressive grinding under suitably protective conditions yields total carbonic anhydrase activities (4800 units per milligram chlorophyll) comparable to the activity in spinach (Spinacia oleracea) leaves. The total ribulose diphosphate carboxylase activity
Extraction of an aqueous suspension of spinach chloroplast lamellae with a chloroform/methanol mixture leads to solubilization of about 1/3 of the total membrane protein. Amino acid analysis of the chloroform/methanol-soluble protein shows that this fraction is largely enriched in the hydrophobic
Similarities in properties of ribulose diphosphate carboxylase and oxygenase activities further substantiate the hypothesis that the same protein catalyzes both reactions. The Km (ribulose diphosphate) is 0.33 mM for the ribulose diphosphate oxygenase, when assayed in air with an oxygen electrode.
Bicarbonate uptake by isolated chloroplast envelope membranes and intact chloroplasts of spinach (Spinacia oleracea L. var. Viroflay) in darkness exhibited a similar dependency upon temperature, pH, time, and concentrations of isolated or attached envelope membranes. This similarity in uptake
Washed whole chloroplasts of Spinacia oleracea isolated and assayed in a tris (hydroxymethyl aminomethane)-HCl buffered sucrose solution exhibited low dark CO(2) fixing activity, whereas washed whole chloroplasts isolated in the same buffer but assayed in that buffer without sucrose exhibited much
A substantial portion of the ribulose 1,5-diphosphate carboxylase activity in the endosperm of germinating castor beans (Ricinus communis var. Hale) is recovered in the proplastid fraction. The partially purified enzyme shows homology with the enzyme from spinach (Spinacia oleracea) leaves, as
Ribulose 1,5-diphosphate carboxylase (RUDPcase) from autotrophically grown Euglena gracilis was purified to homogeneity as measured by analytical ultracentrifugation, polyacrylamide gel electrophoresis, and immunoprecipitation reactions. The enzyme represented about 9% of total protein and 24% of
Intact Euglena gracilis chloroplasts, which had been purified on gradients of silica sol, incorporated [(35)S]methionine or [(3)H]leucine into soluble and membrane-bound products, using light as the only source of energy. The chloroplasts were osmotically shocked, fractionated on discontinuous
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