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- W2071036734 endingPage "e27609" @default.
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- W2071036734 abstract "The proteins that possess guanine nucleotide exchange factor (GEF) activity, which include about ~800 G protein coupled receptors (GPCRs),1 15 Arf GEFs,2 81 Rho GEFs,3 8 Ras GEFs,4 and others for other families of GTPases,5 catalyze the exchange of GTP for GDP on all regulatory guanine nucleotide binding proteins. Despite their importance as catalysts, relatively few exchange factors (we are aware of only eight for ras superfamily members) have been rigorously characterized kinetically.5–13 In some cases, kinetic analysis has been simplistic leading to erroneous conclusions about mechanism (as discussed in a recent review14). In this paper, we compare two approaches for determining the kinetic properties of exchange factors: (i) examining individual equilibria, and; (ii) analyzing the exchange factors as enzymes. Each approach, when thoughtfully used,14,15 provides important mechanistic information about the exchange factors. The analysis as enzymes is described in further detail. With the focus on the production of the biologically relevant guanine nucleotide binding protein complexed with GTP (G•GTP), we believe it is conceptually simpler to connect the kinetic properties to cellular effects. Further, the experiments are often more tractable than those used to analyze the equilibrium system and, therefore, more widely accessible to scientists interested in the function of exchange factors." @default.
- W2071036734 created "2016-06-24" @default.
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- W2071036734 date "2013-01-01" @default.
- W2071036734 modified "2023-10-16" @default.
- W2071036734 title "Quantitative Analysis of Guanine Nucleotide Exchange Factors (GEFs) as Enzymes" @default.
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- W2071036734 doi "https://doi.org/10.4161/cl.27609" @default.
- W2071036734 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4187004" @default.
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