The Model of Calvin Cycle Enzyme Organization on Thylakoid Membranes with the Involvement of the Photosystem I Lectin

The Model of Calvin Cycle Enzyme Organization on Thylakoid Membranes with the Involvement of the... Based on our own and other researchers' experimental data, a model of the light-induced assembly of Calvin cycle enzymes on the membranes of stromal thylakoids is suggested. According to this model, the components involved are: (1) the photosystem I chlorophyll–protein complex containing the P700 reaction center, which possesses a stroma-exposed and pH-dependent carbohydrate-binding site performing both photo- and chemoreceptor functions, and (2) ribulose-1,5-bisphosphate carboxylase (Rubisco), a glycoenzyme, which is a specific ligand of the lectin in the stromal thylakoids. After stroma alkalization in light, the carbohydrate-binding site of the photosystem I pigment–lectin complex is transformed into an active state, and this transformation increases the enzyme carboxylase activity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

The Model of Calvin Cycle Enzyme Organization on Thylakoid Membranes with the Involvement of the Photosystem I Lectin

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1013780732193
Publisher site
See Article on Publisher Site

Abstract

Based on our own and other researchers' experimental data, a model of the light-induced assembly of Calvin cycle enzymes on the membranes of stromal thylakoids is suggested. According to this model, the components involved are: (1) the photosystem I chlorophyll–protein complex containing the P700 reaction center, which possesses a stroma-exposed and pH-dependent carbohydrate-binding site performing both photo- and chemoreceptor functions, and (2) ribulose-1,5-bisphosphate carboxylase (Rubisco), a glycoenzyme, which is a specific ligand of the lectin in the stromal thylakoids. After stroma alkalization in light, the carbohydrate-binding site of the photosystem I pigment–lectin complex is transformed into an active state, and this transformation increases the enzyme carboxylase activity.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

References

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