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Titolo:
RAPID INTERCHANGE BETWEEN 2 DISTINCT FORMS OF CYANOBACTERIAL PHOTOSYSTEM-II REACTION-CENTER PROTEIN-D1 IN RESPONSE TO PHOTOINHIBITION
Autore:
CLARKE AK; SOITAMO A; GUSTAFSSON P; OQUIST G;
Indirizzi:
UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN UNIV TURKU,DEPT BIOL SF-20500 TURKU 50 FINLAND
Titolo Testata:
Proceedings of the National Academy of Sciences of the United Statesof America
fascicolo: 21, volume: 90, anno: 1993,
pagine: 9973 - 9977
SICI:
0027-8424(1993)90:21<9973:RIB2DF>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SP STRAIN PCC-7942; PSBA GENE FAMILY; ANACYSTIS-NIDULANS; LIGHT-INTENSITY; PHOTOSYNTHESIS; SYNECHOCOCCUS; EXPRESSION; CHLOROPLASTS; POLYPEPTIDE; SEQUENCE;
Keywords:
HIGH LIGHT STRESS; PROTEIN TURNOVER; SYNECHOCOCCUS SP; PCC-7942;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
A.K. Clarke et al., "RAPID INTERCHANGE BETWEEN 2 DISTINCT FORMS OF CYANOBACTERIAL PHOTOSYSTEM-II REACTION-CENTER PROTEIN-D1 IN RESPONSE TO PHOTOINHIBITION", Proceedings of the National Academy of Sciences of the United Statesof America, 90(21), 1993, pp. 9973-9977

Abstract

We have studied photoinhibition of photosynthesis in the cyanobacterium Synechococcus sp. PCC 7942, which possesses two distinct forms of the photosystem II reaction-center protein D1 (D1:1 and D1:2). We report here that when cells adapted to a growth irradiance of 50 mumol.m-2.s-1 are exposed to an irradiance of 500 mumol.m-2.s-1, the normally predominant D1 form (D1:1) is rapidly replaced with the alternative D1:2. This interchange is not only complete within the first hour of photoinhibition but is also fully reversible once cells are returned to 50 mumol.m-2.s-1. By using a mutant that synthesizes only D1:1, we show that the failure to replace D1:1 with D1:2 during photoinhibition results in severe loss of photosynthetic activity as well as a diminished capacity to recover after the stress period. We believe that this interchange between D1 forms may constitute an active component in a protection mechanism unique among photosynthetic organisms that enables cyanobacteria to effectively cope with and recover from photoinhibition.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 13:18:56