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Structural organization of photosystem I reaction centers
Author(s) -
Karapetyan N.V.,
Shubin V.V.,
Rakhimberdieva M.G.,
Vashchenko R.G.,
Bolychevtseva Yu.V.
Publication year - 1984
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 - 10.1016/0014-5793(84)81048-0
Subject(s) - p700 , photosystem i , dimer , photosystem ii , photochemistry , light harvesting complexes of green plants , chemistry , circular dichroism , chlorophyll a , crystallography , photosynthetic reaction centre , spectral line , photosynthesis , physics , electron transfer , biochemistry , organic chemistry , astronomy
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, Chl 678 and Chl 685 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 .