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Titolo:
THE STRUCTURAL ORGANIZATION OF THE ANTENN A CHROMOPHORE PROTEIN COMPLEXES IN MEMBRANES OF THE PHOTOSYNTHETIC BACTERIUM RHODOPSEUDOMONAS-VIRIDIS
Autore:
KLEVANIK AV;
Indirizzi:
RUSSIAN ACAD SCI,INST SOIL SCI & PHOTOSYNTH PUSHCHINO 142292 MOSCOW REGION RUSSIA
Titolo Testata:
Biologiceskie membrany
fascicolo: 1, volume: 15, anno: 1998,
pagine: 11 - 23
SICI:
0233-4755(1998)15:1<11:TSOOTA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
RUS
Soggetto:
PRIMARY ELECTRON-DONOR; LIGHT-HARVESTING COMPLEX; REACTION CENTERS; PICOSECOND DYNAMICS; EXCITATION-ENERGY; COHERENT MOTION; PURPLE BACTERIA; SPECTRAL HOLE; FLUORESCENCE; PHOTODICHROISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
A.V. Klevanik, "THE STRUCTURAL ORGANIZATION OF THE ANTENN A CHROMOPHORE PROTEIN COMPLEXES IN MEMBRANES OF THE PHOTOSYNTHETIC BACTERIUM RHODOPSEUDOMONAS-VIRIDIS", Biologiceskie membrany, 15(1), 1998, pp. 11-23

Abstract

A possible structural and functional organization of the antenna chromophore protein complexes (CPC) in the Rhodopseudomonas viridis membranes was considered within the frameworks of structural models proposedby Zuber and Brunisholz (in Chlorophylls / Ed, Scheer H. Boca Raton: CRC Press, 1991. P. 626-703). Analysis of the absorption spectra led to the conclusion that the number of the antenna bacteriochlorophyll molecules per reaction center (RC) is 30 +/- 3 for both chromathophores and quantasomes of Rps. viridis. It implies a multicentral organization of the CPCs around RCs, when the CPC of a cyclic structure is formedby (alpha beta gamma)(4) polypeptides. Analysis of the dependence of the antenna fluorescence yield on the oxidized primary donor concentration being realised within a multicentral model revealed a nearly linear dependence when the antenna fluorescence lifetimes were assumed to be 60-70 and 110-120 ps for the open and closed RCs, respectively, which is in an agreement with the experimental observations. The Rps. viridis membrane domain was concluded to consist of 4-6 RCs surrounded by16-22 CPCs, and both of these protein subsystems are packed into a hexagonal array.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:25:54