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Summary: Cell, Vol. 110, 273276, August 9, 2002, Copyright 2002 by Cell Press
MinireviewPhotosynthesis of ATP--
Electrons, Proton Pumps,
Rotors, and Poise
The name "Z scheme" is retained even where a clock-
wise rotation of the diagram produces, instead, the letter
"N." The upper line of the "Z" is photosystem I, and the
lower line is photosystem II. At the lower right of the "Z,"
electrons originate from water, and oxygen is produced.
John F. Allen1
Department of Plant Biochemistry
Center for Chemistry and Chemical Engineering
Lund University
Box 124
The electrons are moved leftward (or upward, which isSE-221 00 Lund
more intuitive, in the "N") by the reaction centers ofSweden
photosystems I and II. The photosystems themselves
are connected by the oblique line of the intermediary
chain. The electrons arrive finally at the upper left of theLight-driven electron transport is coupled to ATP syn-
"Z," where they produce NADPH. Thus, photosystem Ithesis in chloroplasts. While the nature of the coupling
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