Europium-labeled GTP as a general nonradioactive substitute for [(35)S]GTPgammaS in high-throughput G protein studies.

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Version: Final published version
Serval ID
serval:BIB_63BA4F9A50BC
Type
Article: article from journal or magazin.
Collection
Publications
Title
Europium-labeled GTP as a general nonradioactive substitute for [(35)S]GTPgammaS in high-throughput G protein studies.
Journal
Analytical Biochemistry
Author(s)
Koval A., Kopein D., Purvanov V., Katanaev V.L.
ISSN
1096-0309 (Electronic)
ISSN-L
0003-2697
Publication state
Published
Issued date
2010
Volume
397
Number
2
Pages
202-207
Language
english
Abstract
[(35)S]GTPgammaS, the nonhydrolyzable radioactive GTP analog, has been a powerful tool in G protein studies and has set the standards in this field of research. However, its radioactive nature imposes clear limitations to its use in regular laboratory practice and in high-throughput experimentation. The europium-labeled GTP analog (Eu-GTP) has been used as an alternative in the analysis of G protein activation by G protein-coupled receptors in cellular membrane preparations. Here we expand the usage of Eu-GTP and show that it can be applied in other types of assays where [(35)S]GTPgammaS has been previously utilized. We demonstrate the applicability of the modified Eu-GTP binding technology to analysis of heterotrimeric and monomeric G proteins of natural and recombinant sources, from different organisms, in assays with soluble proteins and membrane-containing assays of a high-throughput format. The deci-nanomolar K(D) of Eu-GTP for the tested G proteins is similar to that of other fluorescent-modified GTP analogs, while the sensitivity achieved in time-resolved fluorescence analysis of Eu-GTP exceeds that of the radioactive measurements. Overall, the results of our modified Eu-GTP binding assay present Eu-GTP as a general nonradioactive alternative for G protein studies, especially attractive in high-throughput experiments.
Keywords
Animals, Europium/metabolism, GTP-Binding Proteins/metabolism, Guanosine 5'-O-(3-Thiotriphosphate)/metabolism, Guanosine Triphosphate/analogs & derivatives, Guanosine Triphosphate/metabolism, Heterotrimeric GTP-Binding Proteins/metabolism, Kinetics, Organometallic Compounds/metabolism, Receptors, G-Protein-Coupled/metabolism, Swine
Pubmed
Web of science
Create date
22/12/2011 16:12
Last modification date
20/08/2019 14:20
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