Plant Physiol. Illumina
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Plant Physiology 61:601-605 (1978)
© 1978 American Society of Plant Biologists

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Web of Science (42)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Anderson, L. E.
Right arrow Articles by Champigny, M.-L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Anderson, L. E.
Right arrow Articles by Champigny, M.-L.
Agricola
Right arrow Articles by Anderson, L. E.
Right arrow Articles by Champigny, M.-L.
Articles

Light Modulation of Enzyme Activity

Activation of the Light Effect Mediators by Reduction and Modulation of Enzyme Activity by Thiol-Disulfide Exchange 1

Louise E. Anderson, Sooja C. Nehrlich and Marie-Louise Champigny2

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

Light and dark modulation experiments with pea (Pisum sativum L.) chloroplast stromal fractions pretreated with dithiothreitol (to reduce protein disulfide bonds) or with 5,5'-dithiobis(2-nitrobenzoic acid) (DTNB) (to block sulfhydryl groups) suggest that light modulation involves thiol-disulfide exchange on the modulatable stromal enzyme protein. Light-dependent reduction of DTNB involves a photosynthetic electron transport chain component located on the reducing side of photosystem I prior to ferredoxin; DTNB may be acting as a light effect mediator substitute. The thylakoid-bound light effect mediator system, then, in its light-activated reduced form probably catalyzes thiol-disulfide exchange reactions on stromal enzymes.

2 Permanent address: Physiologie Cellulaire Végétale, Université de Paris-Sud, 91405 Orsay, France.

1 This research was supported by National Science Foundation Grant PCM 75-02281.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1978 by the American Society of Plant Biologists