This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Web of Science (10) Citing Articles via Google Scholar Google Scholar Articles by Marques, I. A. Articles by Anderson, L. E. Search for Related Content PubMed PubMed Citation Articles by Marques, I. A. Articles by Anderson, L. E. Agricola Articles by Marques, I. A. Articles by Anderson, L. E.

Articles

Changing Kinetic Properties of Fructose-1,6-bisphosphatase from Pea Chloroplasts during Photosynthetic Induction ¹

Department of Biological Sciences, University of Illinois at Chicago, Box 4348, Chicago, Illinois 60680

After dark-light transitions, there is a delay in photosynthetic CO₂ fixation by isolated pea chloroplasts in the range of some minutes. In order to assess the physiological significance of light modulation of enzyme activity in the control of induction, we made estimates of the kinetic parameters of fructose-1,6-bisphosphatase immediately upon release from pea chloroplasts in the dark and after illumination for various time periods. The Michaelis constant for fructose-1,6-bisphosphate decreased and maximal velocities increased during induction. It seems likely that light activation of this enzyme is one of the factors contributing to the overcoming of the lag period in photosynthetic CO₂ fixation.