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Plant Physiology 54:791-793 (1974)
© 1974 American Society of Plant Biologists

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Microenvironmental Manipulation of the Observed Michaelis Constant of Ribulose Diphosphate Carboxylase 1

Louise E. Anderson

a Department of Biological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois 60680

Urease and ribulose 1, 5-diphosphate carboxylase can be bound to Sepharose to give an immobilized two-enzyme system which catalyzes the reaction urea -> H2CO3 -> phosphoglyceric acid. The observed Km of the system for urea approaches the lower value for urease when carboxylase levels on the gel exceed urease levels. If a similar system operates in the chloroplast, the high Km (H2CO3) of ribulose 1,5-diphosphate carboxylase may not be metabolically significant.

1 This work was supported by National Science Foundation Grant GB28160-A1.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1974 by the American Society of Plant Biologists