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Cyclic, pseudocyclic and noncyclic photophosphorylation: new links in

Summary: Cyclic, pseudocyclic and noncyclic
photophosphorylation: new links in
the chain
John F. Allen
Department of Plant Biochemistry, Centre for Chemistry and Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden
Photosynthetic electron transport is coupled to ATP
synthesis. This process photosynthetic phosphoryl-
ation proceeds by several alternative electron-trans-
port pathways in isolated chloroplasts. The question:
`Which of these works in real life?' has long occupied
students of photosynthesis. Recent results from struc-
tural biology and genomics suggest that the answer
is `All of them'. The interplay between the pathways
might explain the flexibility of photosynthesis in meet-
ing different metabolic demands for ATP.
In 1953, the year of the double helix and the conquest of
Everest, photosynthesis as electron transfer was gaining
ground over the idea of photolysis of carbon dioxide. Light-
driven electron transfer photoelectrochemistry had
been demonstrated independently by Robert Hill, working


Source: Allen, John F. - School of Biological and Chemical Sciences, Queen Mary, University of London


Collections: Renewable Energy; Biology and Medicine