期刊论文详细信息
FEBS Letters
A protein conformational change associated with the photoreduction of the primary and secondary quinones in the bacterial reaction center
Nabedryk, E.1  Thibodeau, D.L.1  Bauscher, M.3  Breton, J.1  Mäntele, W.3  Bagley, K.A.2 
[1] Service de Biophysique, C.E.N. Saclay, 91191 Gif-sur-Yvette cedex, France;Department of Physics, University of California at San Diego, La Jolla, CA 92093, USA;Institut für Biophysik und Strahlenbiologie, Albertstr. 23, 7800 Freiburg, FRG
关键词: Fourier transform infrared spectroscopy;    Bacterial reaction center;    Photosynthesis;    Primary quinone;    Secondary quinone;    FTIR;    Fourier transform infrared;    QA (QB);    primary (secondary) quinone;    P;    primary electron donor;    BChl;    bacteriochlorophyll;    RC;    reaction center;   
DOI  :  10.1016/0014-5793(90)81506-J
学科分类:生物化学/生物物理
来源: John Wiley & Sons Ltd.
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【 摘 要 】

A comparison is made between the PQA → P+Q A and PQAQB → P+QAQ B transitions in Rps. viridis and Rb. sphaeroides reaction centers (RCs) by the use of light-induced Fourier transform infrared (FTIR) difference spectroscopy. In Rb. sphaeroides RCs, we identify a signal at 1650 cm−1 which is present in the P+QA-minus-PQA spectrum and not in the P+QAQ B-minus-PQAQB spectrum. In contrast, this signal is present in both P+Q A-minus-PQ A and P+QAQ B-minus-PQAQB spectra of Rps. viridis RCs. These data are interpreted in terms of a conformational change of the protein backbone near QA (possible at the peptide C≡O of a conserved alanine residue in the QA pocket) and of the different bonding interactions of QB with the protein in the RC of the two species.

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