Abstract
The investigation of hormone–receptor interaction normally needs isolation and extensive purification of the receptor protein or a particular receptor-containing fraction. To bypass these time- and resource-consuming procedures, we have established a live cell-based assay using transgenic bacteria expressing single eukaryotic receptors. Here we describe some biochemical features of the Arabidopsis cytokinin receptor CRE1/AHK4 expressed in Escherichia coli. The data show that the main characteristics of the ligand–receptor interaction, including binding affinity and ligand specificity, can be determined using intact bacteria expressing a functional receptor.
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