Kinetic evidence for the function of Z in isolated photosystem II reaction centers

FEBS Letters

Hansson, Ö.¹  Satoh, K.¹  Mathis, P.¹ 

[1] Département de Biologie, SBPh, CEN Saclay, 91191 Gif-sur-Yvette Cedex, France

关键词: Photosynthesis;    Primary reaction;    Tyrosine;    Photosystem II;    DBMIB;    2;    5-dibromothymoquinone;    PS;    photosystem;    P-680;    primary electron donor in PS II;    Z;    tyrosine residue;    secondary electron donor in PS II;   

DOI  :  10.1016/0014-5793(89)81462-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

(D₁,D₂) Photosystem II reaction centers were studied by flash absorption spectroscopy with microsecond resolution. Without addition, absorption transients in the 660–850 nm region are due to a triplet state, probably of P-680, with a decay half-time of 700 μs (no oxygen) or 40 μs (under air). With the addition of DBMIB, presumably acting as electron acceptor, new kinetic and spectral features appear, which are attributed to P-680. A 5 μs phase of decay is present, which is pH-dependent and is attributed to donation from Z to P-680⁺.

【 授权许可】

Unknown