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Titolo:
ELECTRON-TRANSPORT REGULATES EXCHANGE OF 2 FORMS OF PHOTOSYSTEM-II D1PROTEIN IN THE CYANOBACTERIUM SYNECHOCOCCUS
Autore:
CAMPBELL D; ZHOU GQ; GUSTAFSSON P; OQUIST G; CLARKE AK;
Indirizzi:
UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN
Titolo Testata:
EMBO journal
fascicolo: 22, volume: 14, anno: 1995,
pagine: 5457 - 5466
SICI:
0261-4189(1995)14:22<5457:EREO2F>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE-DEPENDENCE; ANACYSTIS-NIDULANS; CHLOROPHYLL FLUORESCENCE; LIGHT-INTENSITY; DISTINCT FORMS; OXIDIZING SIDE; PHOTOSYNTHESIS; PHOTOINHIBITION; POLYPEPTIDE; MUTANTS;
Keywords:
LIGHT-HARVESTING; PHOTOACCLIMATION; PHOTOINHIBITION; PHOTORECEPTOR; PSBA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
D. Campbell et al., "ELECTRON-TRANSPORT REGULATES EXCHANGE OF 2 FORMS OF PHOTOSYSTEM-II D1PROTEIN IN THE CYANOBACTERIUM SYNECHOCOCCUS", EMBO journal, 14(22), 1995, pp. 5457-5466

Abstract

Synechococcus sp, PCC 7942 modulates photosynthetic function by transiently replacing the constitutive D1 photosystem II protein, D1:1, with an alternate form, D1:2, to help counteract photoinhibition under excess light, We show that a temperature drop from 37 to 25 degrees C also drives D1:1/D1:2 exchange under constant, moderate light, Chilling or light-induced D1 exchange results from rapid loss of psbAI message coding for D1:1 and accumulation of psbAII and psbAIII messages codingfor D1:2, During chilling, a large pool of a novel form, D1:2, transiently accumulates, distinguishable from normal D1 by an increase in apparent molecular mass, D1: is not phosphorylated and is probably a functionally inactive, incompletely processed precursor, After acclimation to 25 degrees C, D1:2 disappears and D1:1 again predominates, although substantial D1:2 remains, Partial inhibition of electron transport under constant, moderate light also triggers the D1 exchange process, These treatments all increase excitation pressure on photosystem IIrelative to electron transport, Therefore, information from photosynthetic electron transport regulates D1 exchange without any requirementfor a change in light intensity or quality, possibly via a redox sensing mechanism proximal to photosystem II.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 19:25:52