Stark effect in P700, the primary electron donor of Photosystem I

FEBS Letters

Krawczyk, S.¹  Maksymiec, W.² 

[1] Institute of Physics, M. Curie-Sklodowska University, Radziszewskiego 10, 20-031 Lublin, Poland;Institute of Biology, Division of Plant Physiology, M. Curie-Sklodowska University, Akademicka 19, Lublin, Poland

关键词: Photosynthesis;    Photosystem I;    Reaction center;    Pigment-protein;    P700;    Stark spectrum;   

DOI  :  10.1016/0014-5793(91)80952-Y

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Quadratic Stark effect in CP1 pigment-protein complex was examined at low temperatures in the red spectral region. The Stark spectra of samples containing P700 in reduced form exhibit a strong negative band at 704 nm, which disappears on chemical oxidation of P700. The change in permanent dipole moment, Δμ, of P700 on electronic excitation estimated from these spectra was found to be between 4.7 and 7.7 Debye units. It is suggested to reflect the charge-transfer contribution to the excited state of P700. For antenna chlorophyll, Δμ≌ 1 D was obtained in accordance with the data for monomeric chlorophyll.

【 授权许可】

Unknown