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Summary: The ancestral symbiont sensor kinase CSK links
photosynthesis with gene expression in chloroplasts
Sujith Puthiyaveetil*, T. Anthony Kavanagh
, Peter Cain
, James A. Sullivan*, Christine A. Newell§
, John C. Gray§
,
Colin Robinson
, Mark van der Giezen¶
, Matthew B. Rogers¶
, and John F. Allen*
*School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom; Smurfit Institute of
Genetics, Trinity College Dublin, Dublin 2, Ireland; Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom;
§Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom; and ¶Centre for Eukaryotic
Evolutionary Microbiology, School of Biosciences, University of Exeter, Exeter EX4 4QD, United Kingdom
Communicated by Elisabeth Gantt, University of Maryland, College Park, MD, April 25, 2008 (received for review February 15, 2008)
We describe a novel, typically prokaryotic, sensor kinase in chloro-
plasts of green plants. The gene for this chloroplast sensor kinase
(CSK) is found in cyanobacteria, prokaryotes from which chloroplasts
evolved. The CSK gene has moved, during evolution, from the
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