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Titolo:
The regulatory role of photosystem II photoinactivation and de novo protein synthesis in the degradation and exchange of two forms of the D1 protein in the cyanobacterium Synechococcus PCC 7942
Autore:
Komenda, J; Koblizek, M; Masojidek, J;
Indirizzi:
AcadRepublicch Republ, Inst Microbiol, Lab Photosynth, Trebon 37981, CzechAcad Sci Czech Republ Trebon Czech Republic 37981 h, Trebon 37981, Czech
Titolo Testata:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
fascicolo: 2-3, volume: 48, anno: 1999,
pagine: 114 - 119
SICI:
1011-1344(199902)48:2-3<114:TRROPI>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH LIGHT-INTENSITY; SP STRAIN PCC-7942; 2 FORMS; ANACYSTIS-NIDULANS; DISTINCT FORMS; PSBA GENES; PHOTOINHIBITION; PHOTOSYNTHESIS; EXPRESSION; TURNOVER;
Keywords:
photosystem II; photoinhibition; D1 protein degradation and turnover; cyanobacteria; Synechococcus PCC 7942;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Komenda, J AcadRepublicch Republ, Inst Microbiol, Lab Photosynth, Trebon 37981, Czech Acad Sci Czech Republ Trebon Czech Republic 37981 7981, Czech
Citazione:
J. Komenda et al., "The regulatory role of photosystem II photoinactivation and de novo protein synthesis in the degradation and exchange of two forms of the D1 protein in the cyanobacterium Synechococcus PCC 7942", J PHOTOCH B, 48(2-3), 1999, pp. 114-119

Abstract

After exposure of cells of the cyanobacterium Synechococcus PCC 7942 to increased irradiance, there is a good correlation between the rate of exchange of the 'low-light' form D1:1 for the 'high-light' form D1:2, and the rateof photosystem II photoinactivation (PSIIPI) assessed in chloramphenicol (CAP)-treated cells. This result indicates that PSIIPI triggers the exchangeof D1:1 for D1:2. On the other hand, the reverse exchange of D1:2 for D1:1after return of the cells to low irradiance is apparently independent of PSIIPI. The D1:2 degradation is partially inhibited by the protease inhibitor Pefabloc, suggesting the role of a serine protease in this process. The degradation of both D1:1 under high irradiance and D1:2 under low irradianceis slowed down in the presence of CAP, confirming previous results obtained with other cyanobacterial strains. A comparison of the turnover rates of the D1 forms under high irradiance shows that the radiolabelled D1:2 turns over significantly faster than D1:1. The presence of D1:2 in the membrane therefore improves the protection of PSII against photodamage and this can be the primary reason for the preferential synthesis of this form under highirradiance. (C) 1999 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/10/20 alle ore 05:32:46