Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Volume 104, Issue 1-2, Pages 229-235Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2011.01.016
Keywords
Photosystem II; Light stress; D1 protein; FtsH protease; Thylakoid unstacking
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20570039]
- Okayama University
- Japan Science Society
- Ryobi Foundation
- Nippon Life Insurance Foundation
- Grants-in-Aid for Scientific Research [20570039] Funding Source: KAKEN
Ask authors/readers for more resources
Degradation of the reaction center-binding D1 protein of Photosystem II is central in photoinhibition of Photosystem II. In higher plant chloroplasts, Photosystem II complexes are abundant in the grana. It has been suggested that the Photosystem II complexes containing photodamaged D1 protein migrate for their repair from the grana to the non-appressed stroma thylakoids, where the photodamaged D1 protein is degraded by a specific protease(s) such as filamentation temperature sensitive H (FtsH) protease. There are several possible ways to activate the FtsH proteases. As FtsH is a membrane-bound ATP-dependent metalloprotease, it requires ATP and zinc as essential part of its catalytic mechanism. It is also suggested that a membrane protein(s) associated with FtsH is required for modulation of the FtsH activity. Here, we propose several possible mechanisms for activation of the proteases, which depend on oligomerization of the monomer subunits. In relation to the oligomerization of FtsH subunits, we also suggest unique distribution of active FtsH hexamers on the thylakoids: hexamers of the FtsH proteases are localized near the Photosystem II complexes at the grana. Degradation of the D1 protein probably takes place in the grana rather than in the stroma thylakoids to circumvent long-distance migration of both the Photosystem II complexes containing the photodamaged D1 protein and the proteases. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available