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Evidence for structural distinction between PS II α and PS II β reaction centers
Author(s) -
Hsu Ban-Dar,
Lin Wen-Jye,
Lee Jee-Yau,
Long Pan Rong
Publication year - 1987
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(87)81241-3
Subject(s) - dcmu , photosynthetic reaction centre , chemistry , fluorescence , photosystem ii , crystallography , biophysics , photochemistry , biology , physics , biochemistry , electron transfer , photosynthesis , optics
The technique of (γ‐ray) radiation inactivation has been used to estimate the functional sizes of the PS II centers (PS II α and PS II β ) responsible for the biphasicity of the fluorescence induction curve from DCMU‐inhibited spinach chloroplasts. It is found that the size of PS II α (266 ± 5 kDa) is almost twice as large as that of PS II β (135 ± 5 kDa). The result clearly indicates that the two types of PS II are structurally distinct and furthermore, the difference exists in the reaction center per se. Implications on the organization of PS II reaction centers are discussed.