Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 229-235 |
| Number of pages | 7 |
| Journal | Journal of Photochemistry and Photobiology B: Biology |
| Volume | 104 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Jul 2011 |
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Keywords
- D1 protein
- FtsH protease
- Light stress
- Photosystem II
- Thylakoid unstacking
ASJC Scopus subject areas
- Radiation
- Radiology Nuclear Medicine and imaging
- Radiological and Ultrasound Technology
- Biophysics
Cite this
Quality control of Photosystem II : Where and how does the degradation of the D1 protein by FtsH proteases start under light stress? - Facts and hypotheses. / Nishimura, Miho; Yamamoto, Yasusi.
In: Journal of Photochemistry and Photobiology B: Biology, Vol. 104, No. 1-2, 07.2011, p. 229-235.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quality control of Photosystem II
T2 - Where and how does the degradation of the D1 protein by FtsH proteases start under light stress? - Facts and hypotheses
AU - Nishimura, Miho
AU - Yamamoto, Yasusi
PY - 2011/7
Y1 - 2011/7
N2 - 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.
AB - 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.
KW - D1 protein
KW - FtsH protease
KW - Light stress
KW - Photosystem II
KW - Thylakoid unstacking
UR - http://www.scopus.com/inward/record.url?scp=79957977244&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79957977244&partnerID=8YFLogxK
U2 - 10.1016/j.jphotobiol.2011.01.016
DO - 10.1016/j.jphotobiol.2011.01.016
M3 - Article
VL - 104
SP - 229
EP - 235
JO - Journal of Photochemistry and Photobiology B: Biology
JF - Journal of Photochemistry and Photobiology B: Biology
SN - 1011-1344
IS - 1-2
ER -