作为光系统ii核心中替代电子供体.pdfVIP

Journal of Photochemistry and Photobiology B: Biology 104 (2011) 44–50 Contents lists available at ScienceDirect Journal of Photochemistry and Photobiology B: Biology journal homepage: cate/jphotobiol P680 (PD1PD2) and ChlD1 as alternative electron donors in photosystem II core complexes and isolated reaction centers I.V. Shelaev a, F.E. Gostev a, M.I. Vishnev b, A.Ya. Shkuropatov b, V.V. Ptushenko c, M.D. Mamedov c, O.M. Sarkisov a, V.A. Nadtochenko a, A.Yu. Semenov c, V.A. Shuvalov b,⇑ a N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia b Institute of Basic Biological Problems, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia c A.N. Belosersky Institute of Physical–Chemical Biology, Moscow State University, 119991 Moscow, Russia a r t i c l e i n f o Article history: Low temperature (77–90 K) measurements of absorption spectral changes induced by red light illumina- Available online 5 March 2011 tion in isolated photosystem II (PSII) reaction centers (RCs, D1/D2/Cyt b559 complex) with different external acceptors and in PSII core complexes have shown that two differen ectron donors c ter- : natively function in PSII: chlorophyll (Chl) dimer P680 absorbing at 684 nm and Chl monomer ChlD1 Chlorophyll absorbing at 674 nm. Under physiological conditions (278 K) transient absorption difference spectros- Pheophytin copy wi