Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8359853 | Protein Expression and Purification | 2016 | 6 Pages |
Abstract
Arabidopsis RabE1d subclass plays important plant-specific functions in plant growth and development, response to ethylene and defence to plant pathogen, besides their basic cellular role in membrane trafficking. In this study, we present the expression, purification, and characterization of the recombinant core domain of AtRabE1d13-185. AtRabE1d13-185 was successfully expressed in Escherichia coli and purified via two-step nickel affinity chromatography followed by gel filtration, and identified single band in SDS-PAGE. The resultant protein was functionally active, as determined by interaction with guanine nucleotide by a fluorescence-based assay. The intrinsic tryptophan of AtRabE1d13-185 showed fluorescence resonance energy transfer (FRET) effect upon forming complex with fluorescent methylanthraniloyl (mant)-GDP, but quenched when binding with non-labelled guanine nucleotide. The association rate of mantGDP with AtRabE1d13-185 was determined to be 3.48Â ÃÂ 107Â sâ1Â Mâ1. The dissociation rates of GDP and mantGDP from the complex with AtRabE1d13-185 were similar. The koff values were determined to be 4.02Â ÃÂ 10â4Â sâ1 based on the FRET effect for the AtRabE1d13-185:GDP and 5.41Â ÃÂ 10â4Â sâ1 for mantGDP excited directly.
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Authors
Yi Gao, Lingling Tan, Chun-Hai Dong, Xiaomin Hou,