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Rotational mobility of the photoreaction center in chromatophore membranes of Rhodospirillum rubrum

AuthorsMar, Ted; Picorel Castaño, Rafael ; Gingras, Gabriel
KeywordsRotational mobility
R. rubrum
Reaction center
Chromatophore membrane
Linear dichroism
Bacterial photosynthesis
Issue Date1981
CitationBiochimica et Biophysica Acta (BBA) - Bioenergetics 637 (3): 546-550 (1981)
AbstractWe investigated the rotational mobility of the photoreaction center in chromatophores of Rhodospirillum rubrum by studying the photoinduced linear dichroism of absorption changes at 865 nm. The study was carried out in suspensions of chromatophores treated with ferricyanide in order to bleach their antenna bacteriochlorophyll and thus minimize depolarization by energy transfer. Very little depolarization of the photoinduced absorbance change at 865 nm was observed at room temperature for chromatophores immersed in a highly viscous medium over the time range 0–10 ms following an exciting light flash. In the light of independent evidence for transmembrane arrangement of the photoreaction center, we conclude that the photoreaction center protein is immobilized in the chromatophore membrane for at least 10 ms.
Publisher version (URL)http://dx.doi.org/10.1016/0005-2728(81)90062-1
Identifiersdoi: 10.1016/0005-2728(81)90062-1
issn: 0005-2728
Appears in Collections:(EEAD) Artículos
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