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Spectroelectrochemistry of P700 in native photosystem I particles and diethyl ether‐treated thylakoid membranes from spinach and Thermosynechococcus elongatus

2008; Wiley; Volume: 582; Issue: 7 Linguagem: Inglês

10.1016/j.febslet.2008.02.075

1873-3468

Yanrong Zhang, Akimasa Nakamura, Yoshinori Kuroiwa, Yuki Kato, Tadashi Watanabe,

Spectroscopy and Quantum Chemical Studies

The redox potentials ( E ∘′ ) of P700 in intact and diethyl ether‐treated thylakoid membranes as well as native photosystem (PS) I particles from spinach and Thermosynechococcus elongatus have been measured by a spectroelectrochemistry with an error range of ±2–3 mV. Stepwise removal of antenna pigments by ether treatment caused distinct shifts of the E ∘′ value with increasing degree of water saturation in ether; negatively from +471 to +428 mV for spinach, but positively from +423 to +436 mV for T. elongatus . Such a contrasting behavior is discussed by invoking the mode of action of ether on the microenvironments around P700.