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Significant species‐dependence of P700 redox potential as verified by spectroelectrochemistry: Comparison of spinach and Theromosynechococcus elongatus
Author(s) -
Nakamura Akimasa,
Suzawa Tomoyuki,
Kato Yuki,
Watanabe Tadashi
Publication year - 2005
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2005.02.076
Subject(s) - p700 , spinach , redox , photosystem i , chemistry , photochemistry , photosynthetic reaction centre , photosystem ii , photosynthesis , inorganic chemistry , electron transfer , biochemistry
The redox potentials of P700, the primary electron donor of photosystem (PS) I, of spinach and Thermosynechococcus elongatus were determined by means of spectroelectrochemistry with an error range of ±2–3 mV, to find that the redox potential of P700 in T. elongatus is lower by ca. 50 mV as compared with spinach. The shift in the P700 redox potential of PS I core particles prepared by harsh detergent treatments remained to within 10 mV for both organisms. These results show that the 50 mV difference in the P700 redox potential between the two organisms is not a detergent‐induced artifact but reflects an intrinsic property of each PS I.