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Plant Physiology 85:152-154 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Rubisco Activase Mediates ATP-Dependent Activation of Ribulose Bisphosphate Carboxylase 1

V. J. Streusand and Archie R. Portis, Jr.

Department of Agronomy, University of Illinois, S-215 Turner Hall, 1102 S. Goodwin, Urbana, Illinois 61801, United States Department of Agriculture, Agricultural Research Service, S-215 Turner Hall, 1102 S. Goodwin, Urbana, Illinois 61801

The activation level of ribulosebisphosphate carboxylase following preincubation with ribulose 1,5-bisphosphate was increased by ATP and ribulosebisphosphate carboxylase activase in the absence of thylakoids or illumination. Maximal activation was obtained with 0.5 millimolar ATP in the presence of an ATP regenerating system (phosphoenolpyruvate and pyruvate kinase). Without the ATP regenerating system, activation was lower, linearly dependent on ATP concentration up to 1.0 millimolar, and was strongly inhibited by ADP.

1 Supported in part by United States Department of Agriculture OGPS Grant No. 8600171.




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Copyright © 1987 by the American Society of Plant Biologists