Fluorescence-based assay probing regulator of G protein signaling partner proteins
Resource
ANALYTICAL BIOCHEMISTRY, 423(1), 133-140
Journal
Analytical Biochemistry
Journal Volume
423
Journal Issue
1
Pages
133-140
Date Issued
2012
Date
2012
Author(s)
Abstract
The regulator of G protein signaling (RGS) proteins are one of the essential modulators for the G protein system. Besides regulating G protein signaling by accelerating the GTPase activity of Gα subunits, RGS proteins are implicated in exerting other functions; they are also known to be involved in several diseases. Moreover, the existence of a single RGS protein in plants and its seven-transmembrane domain found in 2003 triggered efforts to unveil detailed structural and functional information of RGS proteins. We present a method for real-time examination of the protein-protein interactions between RGS and Gα subunits. AtRGS1 from plants and RGS4 from mammals were site-directedly labeled with the fluorescent probe Lucifer yellow on engineered cysteine residues and used to interact with different Gα subunits. The physical interactions can be revealed by monitoring the real-time fluorescence changes (8.6% fluorescence increase in mammals and 27.6% in plants); their correlations to functional exertion were shown with a GTPase accelerating activity assay and further confirmed by measurement of Kd. We validate the effectiveness of this method and suggest its application to the exploration of more RGS signaling partner proteins in physiological and pathological studies. © 2012 Elsevier Inc. All rights reserved.
Subjects
Fluorescence; G proteins; Protein-protein interaction; RGS
Other Subjects
Activation analysis; Amino acids; Fluorescence; Mammals; Signaling; Cysteine residues; Fluorescent probes; Functional information; G protein; ITS applications; Physical interactions; Protein-protein interactions; Trans-membrane domains; Proteins; guanine nucleotide binding protein alpha subunit; guanosine triphosphatase; lucifer yellow; RGS protein; article; enzyme activity; fluorescence analysis; mammal; nonhuman; plant; priority journal; protein analysis; protein protein interaction; Mammalia
Type
journal article
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