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Snow, Bryan E.; Betts, Laurie; Mangion, Joan; Sondek, John; Siderovski, David P.
Proceedings of the National Academy of Sciences - PNAS, 05/1999, Letnik: 96, Številka: 11Journal Article
Several regulators of G protein signaling (RGS) proteins contain a G protein γ -subunit-like (GGL) domain, which, as we have shown, binds to Gβ 5 subunits. Here, we extend our original findings by describing another GGL-domain-containing RGS, human RGS6. When RGS6 is coexpressed with different Gβ subunits, only RGS6 and Gβ 5 interact. The expression of mRNA for RGS6 and Gβ 5 in human tissues overlaps. Predictions of α -helical and coiled-coil character within GGL domains, coupled with measurements of Gβ binding by GGL domain mutants, support the contention that Gγ-like regions within RGS proteins interact with Gβ 5 subunits in a fashion comparable to conventional Gβ/Gγ pairings. Mutation of the highly conserved Phe-61 residue of Gγ 2 to tryptophan, the residue present in all GGL domains, increases the stability of the Gβ 3/Gγ 2 heterodimer, highlighting the importance of this residue to GGL/Gβ 5 association.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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