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CHAPTER ONE J.F. Allen, E. Gantt, J.H. Golbeck, and B. Osmond (eds.),

J.F. Allen, E. Gantt, J.H. Golbeck, and B. Osmond (eds.),
Photosynthesis. Energy from the Sun:
14th International Congress on Photosynthesis,
11551160. 2008 Springer.
Redox Switches and Evolutionary Transitions
John F. Allen, Carol A. Allen, and Sujith Puthiyaveetil
Abstract A redox switch is a signal transduction
event or pathway that places gene expression under
the regulatory control of the redox state of an elec-
tron carrier. Here we propose that the redox state
of a quinone such as plastoquinone, ubiquinone or
menaquinone is sensed and used as information to
decide on the expression of genes for components
of photosynthesis. Three quinone redox switches
are proposed. The first, and most ancient, selects
between transcription of type I and type II reac-
tion centres. It is proposed that simple mutation in
this redox switch produced constitutive expression
of type I and type II reaction centres and so gave


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


Collections: Renewable Energy; Biology and Medicine