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• W1489654012 endingPage "1817" @default.
• W1489654012 startingPage "1811" @default.
• W1489654012 abstract "High efficiency transient transfection was used to introduce cDNA corresponding to various G protein alpha subunits into Cos-7 cells. The proteins that were subsequently synthesized were detected with specific G protein alpha subunit antipeptide antiserum and were localized in the membrane fraction of the cell. Cells that were prelabeled with the [3H]inositol and transfected with G alpha q and G alpha 11 cDNA showed marked increases in formation of [3H]inositol phosphates after stimulation with aluminum fluoride. Co-transfection with cDNAs corresponding to phosphoinositide specific phospholipase C beta 1 (PI-PLC beta 1) and to G alpha q or G alpha 11 resulted in even higher levels of inositol phosphate formation. The introduction of mutations that convert residue glutamine 209 to leucine in G alpha q and G alpha 11 resulted in persistent activation of PI-PLC and high steady state levels of inositol phosphates. On the other hand, transfection with a variety of other G alpha subunit cDNAs, i.e. G alpha Z, G alpha OA, G alpha OB, transducin, and the glutamine 205 to leucine mutants of G alpha Z and of G alpha OA did not increase inositol phosphate formation. To further test the specificity of G protein activation of PI-PLC, a cell-free system was prepared by using washed membranes of transiently transfected cells and purified PI-PLC beta 1. Membranes derived from G alpha q and G alpha 11, but not G alpha OA transfected cells, showed guanosine 5-O-thiotriphosphate (GTP gamma S)-stimulated PIP2 hydrolysis. The activity seen in the system reconstituted with membranes derived from G alpha 11-transfected cells was blocked by preincubation with specific G alpha 11 antipeptide antibodies. All of these results are consistent with the conclusion that G alpha q and G alpha 11 cDNA encode proteins that in the presence of GTP gamma S specifically activate PI-PLC." @default.
• W1489654012 created "2016-06-24" @default.
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• W1489654012 date "1992-01-01" @default.
• W1489654012 modified "2023-10-15" @default.
• W1489654012 title "Activation of phospholipase C by the alpha subunits of the Gq and G11 proteins in transfected Cos-7 cells." @default.
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• W1489654012 doi "https://doi.org/10.1016/s0021-9258(18)46018-8" @default.
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