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A redox‐dependent interaction between two electron‐transfer partners involved in photosynthesis
Author(s) -
Morales Renaud,
Charon MarieHélène,
Kachalova Galina,
Serre Laurence,
Medina Milagros,
GómezMoreno Carlos,
Frey Michel
Publication year - 2000
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1093/embo-reports/kvd057
Subject(s) - ferredoxin , photosynthesis , redox , electron transfer , photosystem i , ferredoxin—nadp(+) reductase , photochemistry , photosystem , electron transport chain , photosystem ii , biophysics , chemistry , biology , biochemistry , enzyme , organic chemistry
Ferredoxin:NADP + :reductase (FNR) catalyzes one terminal step of the conversion of light energy into chemical energy during photosynthesis. FNR uses two high energy electrons photoproduced by photosystem I (PSI) and conveyed, one by one, by a ferredoxin (Fd), to reduce NADP + to NADPH. The reducing power of NADPH is finally involved in carbon assimilation. The interaction between oxidized FNR and Fd was studied by crystallography at 2.4 Å resolution leading to a three‐dimensional picture of an Fd–FNR biologically relevant complex. This complex suggests that FNR and Fd specifically interact prior to each electron transfer and disassemble upon a redox‐linked conformational change of the Fd.