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J. theor. Biol. (1993) 165, 609-631 Control of Gene Expression by Redox Potential and the

Summary: J. theor. Biol. (1993) 165, 609-631
Control of Gene Expression by Redox Potential and the
Requirement for Chloroplast and Mitochondrial Genomes
Plant Cell Biology, Lund University, Box 7007, 5-220 07 Lund, Sweden
(Received on 19 November 1992, Accepted in revised form on 23 June 1993)
Recent experiments with bacteria have shown that light and oxygen can control gene
expression through effects on oxidation-reduction potential. The term "redox
sensor" is proposed as a general term for electron carriers that initiate control of
gene expression upon oxidation or reduction. The term "redox response regulator" is
proposed for DNA-binding proteins that modify gene expression as a result of the
action of redox sensors. Redox sensors and redox response regulators may function
together in feedback control of redox potential in photosynthesis and respiration,
protecting the cell from damage caused by electrochemistry operating on inappro-
priate electron donors and acceptors. Chloroplast and mitochondrial redox sensors
and redox response regulators, themselves encoded in the nucleus, may place
expression of chloroplast and mitochondrial genes under redox regulatory control.
This hypothesis offers an explanation for the persistence, in evolution, of chloroplast
and mitochondrial genomes, and for the constancy of the subset of chloroplast and
mitochondrial proteins encoded and synthesized within the organelle.


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


Collections: Renewable Energy; Biology and Medicine