PMID:12692329

Citation	Moshkov, IE, Mur, LA, Novikova, GV, Smith, AR and Hall, MA (2003) Ethylene regulates monomeric GTP-binding protein gene expression and activity in Arabidopsis. Plant Physiol. 131:1705-17
Abstract	Ethylene rapidly and transiently up-regulates the activity of several monomeric GTP-binding proteins (monomeric G proteins) in leaves of Arabidopsis as determined by two-dimensional gel electrophoresis and autoradiographic analyses. The activation is suppressed by the receptor-directed inhibitor 1-methylcyclopropene. In the etr1-1 mutant, constitutive activity of all the monomeric G proteins activated by ethylene is down-regulated relative to wild type, and ethylene treatment has no effect on the levels of activity. Conversely, in the ctr1-1 mutant, several of the monomeric G proteins activated by ethylene are constitutively up-regulated. However, the activation profile of ctr1-1 does not exactly mimic that of ethylene-treated wild type. Biochemical and molecular evidence suggested that some of these monomeric G proteins are of the Rab class. Expression of the genes for a number of monomeric G proteins in response to ethylene was investigated by reverse transcriptase-PCR. Rab8 and Ara3 expression was increased within 10 min of ethylene treatment, although levels fell back significantly by 40 min. In the etr1-1 mutant, expression of Rab8 was lower than wild type and unaffected by ethylene; in ctr1-1, expression of Rab8 was much higher than wild type and comparable with that seen in ethylene treatments. Expression in ctr1-1 was also unaffected by ethylene. Thus, the data indicate a role for monomeric G proteins in ethylene signal transduction.
Links	PubMed PMC166926 Online version:10.1104/pp.014035
Keywords	Amino Acid Sequence; Animals; Arabidopsis/drug effects; Arabidopsis/genetics; Arabidopsis/metabolism; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Cyclopropanes/pharmacology; Ethylenes/pharmacology; Gene Expression Regulation, Plant/drug effects; Genes, Plant/genetics; Humans; Molecular Sequence Data; Monomeric GTP-Binding Proteins/genetics; Monomeric GTP-Binding Proteins/metabolism; Mutation/genetics; Phylogeny; Plant Growth Regulators/pharmacology; Sequence Homology, Amino Acid; Signal Transduction/drug effects; Up-Regulation/drug effects
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Gene product	Qualifier	GO ID	GO term name	Evidence Code	with/from	Aspect	Notes	Status
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