'Two-component' ethylene signaling in Arabidopsis
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Updated: Oct 18, 2026

Utilizing the Ethylene-releasing Compound, 2-Chloroethylphosphonic Acid, as a Tool to Study Ethylene Response in Bacteria
Published on: November 10, 2016
1Department of Plant Biology, University of Maryland, College Park 20742, USA. cc203@umail.umd.edu
Abstract:
The Arabidopsis ETR1 gene codes for an ethylene hormone receptor that has striking sequence similarity with bacterial two-component regulators. This finding predicts that the ETR1 receptor transduces the ethylene signal through the phosphotransfer mechanisms established for a number of the bacterial regulators. To test this hypothesis, we have performed in vitro assays for ETR1 autokinase activity as well as for transfer of phosphate to the ETR1 receiver. So far, we have not detected either of these activities. Another question we are focusing on is the identity of protein substrates of the ETR1 receptor. Using the yeast two-hybrid system, we have obtained several clones to be subsequently characterized as potential interactors with ETR1.
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