Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Role of two forms of the D1 protein in the recovery from photoinhibition of photosystem II in the cyanobacterium Synechococcus PCC 7942
Autore:
Komenda, J;
Indirizzi:
Acad Sci Czech Republ, Inst Microbiol, Lab Photosynth, Trebon 37981, CzechRepublic Acad Sci Czech Republ Trebon Czech Republic 37981 n 37981, CzechRepublic
Titolo Testata:
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
fascicolo: 3, volume: 1457, anno: 2000,
pagine: 243 - 252
SICI:
0005-2728(20000421)1457:3<243:ROTFOT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH LIGHT-INTENSITY; SP STRAIN PCC-7942; 2 FORMS; SYNECHOCYSTIS PCC-6803; ANACYSTIS-NIDULANS; DISTINCT FORMS; PSBA GENES; DEGRADATION; EXPRESSION; PHOTOSYNTHESIS;
Keywords:
cyanobacterium; D1 protein; photoinhibition; photosynthesis; photosystem II; Synechococcus PCC 7942;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Komenda, J Acad Sci Czech Republ, Inst Microbiol, Lab Photosynth, Opatovicky Mlyn, Trebon 37981, Czech Republic Acad Sci Czech Republ Opatovicky MlynTrebon Czech Republic 37981
Citazione:
J. Komenda, "Role of two forms of the D1 protein in the recovery from photoinhibition of photosystem II in the cyanobacterium Synechococcus PCC 7942", BBA-BIOENER, 1457(3), 2000, pp. 243-252

Abstract

The study of turnover of two distinct forms of the photosystem II (PSII) D1 protein in cells of the cyanobacterium Synechococcus PCC 7942 showed thatthe 'high-light' form D1:2 is degraded significantly faster at 500 mu E m(-2) s(-1) as compared with 50 mu E m(-2) s(-1) while the degradation rates of the 'low-light' form D1:1 under low and high irradiance are not substantially different. Consequently, the D1:1 turnover does not match photoinactivation of PSII under increased irradiance and therefore the cells containing this D1 form exhibit a decrease in the PSII activity. Monitoring of the content of each D1 form during a recovery from growth-temperature photoinhibition showed a good correlation between the synthesis of D1:2 and restoration of the PSII activity. In contrast, when photoinhibitory treatment was conducted at low temperature, a fast recovery was not accompanied by the D1:2accumulation. The data suggest that photoinactivation at growth temperature results in a modification of PSII that inhibits insertion of D1:1 and, therefore, for restoration of the photochemical activity in the photoinactivated PSII complexes the D1:2 synthesis is needed. This may represent the primary reason for the requirement of psbAII/psbAIII expression under increased irradiance. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 04:14:17