PMID: 11607369Feb 15, 1993Paper

Guanine nucleotide binding protein involvement in early steps of phytochrome-regulated gene expression

Proceedings of the National Academy of Sciences of the United States of America
L C Romero, E Lam

Abstract

The transmission process of light signals from plant photoreceptors to target cellular events is largely unknown. In the present work, we show that treatment of dark-adapted soybean cells (SB-P) with cholera toxin or pertussis toxin uncouples phytochrome-dependent gene expression. Addition of as little as 10 ng of toxin per ml is sufficient to activate expression of genes encoding the major chlorophyll a/b-binding protein (cab) in the dark. Significant levels of cab transcript accumulation are detected within 0.5 h after addition of the toxins and expression of these genes is desensitized to further light treatments. Treatment of SB-P cells with the calmodulin antagonist N-(6-aminohexyl)-5-chloro-1-naphtha-lenesulfonamide hydrochloride (W-7) prevents induction of the photoregulated gene by phytochrome or bacterial toxins. These results indicate the involvement of guanine nucleotide binding protein(s) in phytochrome-mediated cab gene activation. A likely site of action for this step is between the photoreceptor and a downstream W-7-sensitive effector.

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Citations

Dec 1, 1994·Plant Molecular Biology·T D Elich, J Chory
Dec 1, 1994·Plant Molecular Biology·H Ma
Jun 1, 1994·Plant Molecular Biology·C Z JiangS Rodermel
Mar 26, 1998·Biochimica Et Biophysica Acta·T MunnikA Musgrave
Jul 29, 1998·The Plant Journal : for Cell and Molecular Biology·D A Christopher, P H Hoffer
Dec 1, 1996·Photochemistry and Photobiology·J M Staub, X W Deng
May 13, 2004·Photochemistry and Photobiology·George TsolakisKiriakos Kotzabasis
Sep 1, 1994·Current Biology : CB·J Chory
Aug 28, 2001·Plant & Cell Physiology·Y FujisawaY Iwasaki
Nov 4, 1998·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·R Hooley
Dec 1, 2001·Plant & Cell Physiology·A Tsuruhara, T Tezuka
Nov 5, 1999·Molecular Cell Biology Research Communications : MCBRC·N RaghuramS K Sopory
Apr 14, 2004·Journal of Plant Physiology·Adriana Szmidt-JaworskaJan Kopcewicz

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