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- W1998641605 abstract "Rab3A, a member of the Rab3 small G protein family, regulates Ca2+-dependent exocytosis of neurotransmitter. The cyclical activation and inactivation of Rab3A are essential for the Rab3A action in exocytosis. GDP-Rab3A is activated to GTP-Rab3A by Rab3 GDP/GTP exchange protein (Rab3 GEP) and GTP-Rab3A is inactivated to GDP-Rab3A by Rab3 GTPase-activating protein (Rab3 GAP). We have recently found a novel protein, named rabconnectin-3, which is co-immunoprecipitated with Rab3 GEP or GAP from the extract of the crude synaptic vesicle (CSV) fraction of rat brain. Rabconnectin-3 is abundantly expressed in the brain where it is associated with synaptic vesicles. We have found that two more proteins are co-immunoprecipitated with Rab3 GEP from the CSV fraction of rat brain. We attempted here to isolate and characterize one of them.We determined its partial amino acid sequence, cloned its cDNA from a human cDNA library, and determined its primary structure. The protein consisted of 1490 amino acids (aa) and showed a calculated molecular weight of 163808. The protein had 7 WD domains. The protein was abundantly expressed in the brain where it co-localized with rabconnectin-3 on synaptic vesicles. The protein formed a stable complex with rabconnectin-3. We named this protein rabconnectin-3beta and renamed rabconnectin-3 rabconnectin-3alpha. Rabconnectin-3beta, but not rabconnectin-3alpha, directly bound Rab3 GEP. Neither rabconnectin-3alpha nor -3beta directly bound Rab3 GAP.These results indicate that rabconnectin-3 consists of the alpha and beta subunits and binds directly Rab3 GEP through the beta subunit and indirectly Rab3 GAP through an unidentified molecule(s)." @default.
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- W1998641605 date "2003-06-01" @default.
- W1998641605 modified "2023-10-11" @default.
- W1998641605 title "A novel rabconnectin-3-binding protein that directly binds a GDP/GTP exchange protein for Rab3A small G protein implicated in Ca<sup>2+</sup>-dependent exocytosis of neurotransmitter" @default.
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- W1998641605 doi "https://doi.org/10.1046/j.1365-2443.2003.00655.x" @default.
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