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Plant Physiol. 1985 Jul;78(3):586-90.

Immunological evidence for the presence of ribulose bisphosphate carboxylase in guard cell chloroplasts.

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  • 1Department of Biology, Technion-Israel Institute of Technology, Haifa 32 000, Israel.

Abstract

Ribulose bisphosphate carboxylase (Rubisco) has been found in Vicia faba L. guard cell chloroplasts by two immunological methods, using antibodies raised against highly purified subunits of ribulose bisphosphate carboxylase. Indirect cytoimmunofluorescence revealed binding of antibodies against both the small and the large subunits of ribulose bisphosphate carboxylase. Binding was observed only after partial digestion of guard cell walls by 4% Cellulysin to facilitate antibody penetration. After electrophoresis of a homogenate of guard cell protoplasts, the presence of both subunits was also revealed by immunolabeling technique. Positive response required the inhibition of proteolysis which appeared to be active upon homogenization.

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