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PHYSIOLOGIA PLANTARUM 100: 863-868, 1997 Printed in Denmark -all rights reserved

Summary: PHYSIOLOGIA PLANTARUM 100: 863-868, 1997
Printed in Denmark - all rights reserved
Copyright Physiologia Plantarum 1997
ISSN 0031-9317
Redox signalling and the structural basis of regulation of
photosynthesis by protein phosphorylation
J. F. Allen and A. Nilsson
Allen, J, E and Nilsson, A, 1997, Redox signalling and the structural basis of regula-
tion of photosynthesis by protein phosphorylation, - Physiol, Plant, 100: 863-868,
In photosynthesis in chloroplasts and cyanobacteria, redox control of thylakoid pro-
tein phosphorylation regulates distribution of absorbed excitation energy between the
two photosystems. When electron transfer through chloroplast photosystem II (PSII)
proceeds at a rate higher than that through photosystem I (PSI), chemical reduction of
a redox sensor activates a thylakoid protein kinase that catalyses phosphorylation of
light-harvesting complex II (LHCII), Phosphorylation of LHCII increases its affinity
for PSI and thus redistributes light-harvesting chlorophyll to PSI at the expense of
PSII, This short-term redox signalling pathway acts by means of reversible,
post-translational modification of pre-existing proteins, A long-term equalisation of
the rates of light utilisation by PSI and PSII also occurs: by means of adjustment of
the stoichiometry of PSI and PSII, It is likely that the same redox sensor controls both


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


Collections: Renewable Energy; Biology and Medicine