NDLI: FtsH Is Involved in the Early Stages of Repair of Photosystem II in Synechocystis sp PCC 6803W⃞

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FtsH Is Involved in the Early Stages of Repair of Photosystem II in Synechocystis sp PCC 6803W⃞

Content Provider	PubMed Central
Author	Silva, Paulo Thompson, Elinor Bailey, Shaun Kruse, Olaf Mullineaux, Conrad W. Robinson, Colin Mann, Nicholas H. Nixon, Peter J.
Copyright Year	2003
Abstract	When plants, algae, and cyanobacteria are exposed to excessive light, especially in combination with other environmental stress conditions such as extreme temperatures, their photosynthetic performance declines. A major cause of this photoinhibition is the light-induced irreversible photodamage to the photosystem II (PSII) complex responsible for photosynthetic oxygen evolution. A repair cycle operates to selectively replace a damaged D1 subunit within PSII with a newly synthesized copy followed by the light-driven reactivation of the complex. Net loss of PSII activity occurs (photoinhibition) when the rate of damage exceeds the rate of repair. The identities of the chaperones and proteases involved in the replacement of D1 in vivo remain uncertain. Here, we show that one of the four members of the FtsH family of proteases (cyanobase designation slr0228) found in the cyanobacterium Synechocystis sp PCC 6803 is important for the repair of PSII and is vital for preventing chronic photoinhibition. Therefore, the ftsH gene family is not functionally redundant with respect to the repair of PSII in this organism. Our data also indicate that FtsH binds directly to PSII, is involved in the early steps of D1 degradation, and is not restricted to the removal of D1 fragments. These results, together with the recent analysis of ftsH mutants of Arabidopsis, highlight the critical role played by FtsH proteases in the removal of damaged D1 from the membrane and the maintenance of PSII activity in vivo.
Related Links	http://dx.doi.org/10.1105/tpc.012609
Ending Page	2164
Page Count	13
Starting Page	2152
File Format	PDF
ISSN	10404651
e-ISSN	1532298X
Journal	The Plant Cell
Issue Number	9
Volume Number	15
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2003-08-01
Access Restriction	Open
Rights Holder	American Society of Plant Biologists
Subject Keyword	Plant Science Cell Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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FtsH is involved in the early stages of repair of photosystem II in Synechocystis sp PCC 6803.

Investigating the Early Stages of Photosystem II Assembly in Synechocystis sp. PCC 6803

Subunit Organization of a Synechocystis Hetero-Oligomeric Thylakoid FtsH Complex Involved in Photosystem II Repair [C] [W] [OA]

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FtsH Is Involved in the Early Stages of Repair of Photosystem II in Synechocystis sp PCC 6803W⃞

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FtsH Is Involved in the Early Stages of Repair of Photosystem II in Synechocystis sp PCC 6803W⃞