Structural organization of photosystem I reaction centers

FEBS Letters

Vashchenko, R.G.¹  Rakhimberdieva, M.G.¹  Shubin, V.V.¹  Bolychevtseva, Yu.V.¹  Karapetyan, N.V.¹ 

[1] A.N. Bakh Institute of Biochemistry, Academy of Sciences of the USSR, Moscow 117071, Leninsky pr. 33, USSR

关键词: Photosynthesis;    Chlorophyll-protein complex;    Photosystem I;    Circular dichroism P700;    CD;    circular dichroism;    Chl;    chlorophyll;    PSI;    Photosystem I;    CPI;    chlorophyll-protein complex of PSI;    P700;    primary electron donor of PSI;   

DOI  :  10.1016/0014-5793(84)81048-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Using a phosphoroscopic attachment to the dichrograph, light-induced circular dichroism spectra have been measured for chlorophyll-protein complexes of Photosystem I. Minor components at 672, 678 and 685 nm are observed in these spectra in addition to the components of dimer splitting of the P700 Q_y transition at 691 and 698 nm. The minor components are due to the Chl672, Chl₆₇₈ and Chl₆₈₅ forms of antenna chlorophylls, the optical activity of which is changed 2–4% as a result of P700 oxidation. It is suggested that P700 is not an isolated dimer but that it is included in a local complex comprising 8–10 chlorophyll molecules with an exciton level splitting value of 120–140 cm⁻¹.

【 授权许可】

Unknown