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• W2034762571 abstract "Resistance to inhibitors of cholinesterase (Ric) 8A is a guanine nucleotide exchange factor that activates certain G protein α-subunits. Genetic studies in Caenorhabditis elegans and Drosophila melanogaster have placed RIC-8 in a previously uncharacterized G protein signaling pathway that regulates centrosome movements during cell division. Components of this pathway include G protein subunits of the Gαi class, GPR or GoLoco domain-containing proteins, RGS (regulator of G protein signaling) proteins, and accessory factors. These proteins interact to regulate microtubule pulling forces during mitotic movement of chromosomes. It is unclear how the GTP-binding and hydrolysis cycle of Gαi functions in the context of this pathway. In mammals, the GoLoco domain-containing protein LGN (GPSM2), the LGN- and microtubule-binding nuclear mitotic apparatus protein (NuMA), and Gαi regulate a similar process. We find that mammalian Ric-8A dissociates Gαi-GDP/LGN/NuMA complexes catalytically, releasing activated Gαi-GTP in vitro . Ric-8A-stimulated activation of Gαi caused concomitant liberation of NuMA from LGN. We conclude that Ric-8A efficiently utilizes GoLoco/Gαi-GDP complexes as substrates in vitro and suggest that Ric-8A-stimulated release of Gαi-GTP and/or NuMA regulates the microtubule pulling forces on centrosomes during cell division." @default.
• W2034762571 created "2016-06-24" @default.
• W2034762571 creator A5054552947 @default.
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• W2034762571 date "2005-11-07" @default.
• W2034762571 modified "2023-10-17" @default.
• W2034762571 title "Resistance to inhibitors of cholinesterase 8A catalyzes release of Gαi-GTP and nuclear mitotic apparatus protein (NuMA) from NuMA/LGN/Gαi-GDP complexes" @default.
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• W2034762571 doi "https://doi.org/10.1073/pnas.0508306102" @default.
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