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FEBS Lett. 1991 May 6;282(2):341-6.

G-proteins in etiolated Avena seedlings. Possible phytochrome regulation.

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Institute for Cellular and Molecular Photobiology, University of Nebraska-Lincoln 68588-0304.


The molecular mechanism of light signal transduction in plants mediated by the photosensor phytochrome is not well understood. The possibility that phytochrome initiates the signal transduction chain by modulating a G-protein-like receptor is examined in the present work. Etiolated Avena seedlings contain G-proteins as examined in terms of the binding of GTP as well as by cross-reaction with mammalian G-protein antibodies. The binding of GTP was regulated in vivo by red/far-red light. The possible involvement of G-proteins in the phytochrome-mediated signal transduction in etiolated Avena seedlings has been implicated from the study of the light regulated expression of the Cab and phy genes.

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