Turnover of D1 protein encoded by psbA gene in higher plants and cyanobacteria sustains photosynthetic efficiency to maintain plant productivity under photoinhibitory irradiance

Title:

Turnover of D1 protein encoded by psbA gene in higher plants and cyanobacteria sustains photosynthetic efficiency to maintain plant productivity under photoinhibitory irradiance

Creator:

Singh, M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:abea02cc-edb2-4002-b675-e240ffb3986e
uuid:abea02cc-edb2-4002-b675-e240ffb3986e
issn:0300-3604
doi:10.1023/A:1007297227403

Subject:

irradiation stress, lincomycin, photosynthesis, protein synthesis and degradation, recovery, and Synechocystis

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The photosynthesis and related plant productivity aspects of plants and cyanobacteria depend upon the functioning of photosystem 2 (PS2), associated with D1 and D2 heterodimer reaction centre core proteins. The D1 protein is encoded by psbA gene, genetically localized on the plastid genome (cpDNA), contains functional cofactors of PS2 in association with D2 protein, and also functions for radiant energy transformation through oxidation of water and reduction of plastoquinone. Surprisingly, D1 protein accounts for even less than 1% of the total thylakoid membrane protein content. In spite of that, its rate of turnover is very much comparable to ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) large subunit, most abundantly present in green tissue. The normal functioning of PS2 possesses damage-repair cycles of D1 protein. Generally, rate of photodamage does not exceed the rate of repair under optimal growth conditions, therefore, no adverse effect on photosynthetic efficiency is manifest. However, under strong irradiance coupled with elevated temperature, level of photodamage exceeds the rate of repair, resulting in photoinhibition, photodegradation of D1 protein, and lowering photosynthetic efficiency linked with plant productivity eventually. The features of D1 turnover process are reviewed, particularly with respect to molecular mechanisms.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

161-169

Source:

Photosynthetica | 2000 Volume:38 | Number:2

Harvested from:

CDK

Metadata only:

false