{"doi":"10.1074/jbc.m116.773523","title":"Gβγ directly modulates vesicle fusion by competing with synaptotagmin for binding to neuronal SNARE proteins embedded in membranes","abstract":null,"journal":"Journal of Biological Chemistry","year":2017,"id":657833,"datarank":1.1281389115763831,"base_score":3.6888794541139363,"endowment":3.6888794541139363,"self_citation_contribution":0.5533319181170905,"citation_network_contribution":0.5748069934592926,"self_endowment_contribution":0.5533319181170905,"citer_contribution":0.5748069934592926,"corpus_percentile":null,"corpus_rank":null,"citation_count":39,"citer_count":25,"citers_with_citation_signal":23,"citers_with_endowment":23,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":651843,"name":"Brian Page","orcid":"0000-0002-8945-568X","position":1,"is_corresponding":false},{"id":1717254,"name":"Michael C. Chicka","orcid":null,"position":2,"is_corresponding":false},{"id":515273,"name":"Rebecca L. Brindley","orcid":"0000-0002-4357-4413","position":3,"is_corresponding":false},{"id":1717255,"name":"Christopher A. Wells","orcid":null,"position":4,"is_corresponding":false},{"id":609881,"name":"Anita M. Preininger","orcid":"0000-0001-8011-9391","position":5,"is_corresponding":false},{"id":575167,"name":"Karren Hyde","orcid":null,"position":6,"is_corresponding":false},{"id":1717259,"name":"James A. Gilbert","orcid":null,"position":7,"is_corresponding":false},{"id":1717260,"name":"Osvaldo Cruz-Rodriguez","orcid":null,"position":8,"is_corresponding":false},{"id":1717261,"name":"Kevin P.M. Currie","orcid":null,"position":9,"is_corresponding":false},{"id":299758,"name":"Edwin R. Chapman","orcid":"0000-0001-9787-8140","position":10,"is_corresponding":false},{"id":416115,"name":"Simon Alford","orcid":"0000-0002-0454-4246","position":11,"is_corresponding":false},{"id":511533,"name":"Heidi E. Hamm","orcid":"0000-0001-5437-5287","position":12,"is_corresponding":false},{"id":577033,"name":"Zack Zurawski","orcid":"0000-0003-3621-5137","position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Gβγ directly modulates vesicle fusion by competing with synaptotagmin for binding to neuronal SNARE proteins embedded in membranes","abstract":"G i/o -coupled G protein-coupled receptors can inhibit neurotransmitter release at synapses via multiple mechanisms. In addition to Gβγ-mediated modulation of voltage-gated calcium channels (VGCC), inhibition can also be mediated through the direct interaction of Gβγ subunits with the soluble N -ethylmaleimide attachment protein receptor (SNARE) complex of the vesicle fusion apparatus. Binding studies with soluble SNARE complexes have shown that Gβγ binds to both ternary SNARE complexes, t-SNARE heterodimers, and monomeric SNAREs, competing with synaptotagmin 1(syt1) for binding sites on t-SNARE. However, in secretory cells, Gβγ, SNAREs, and synaptotagmin interact in the lipid environment of a vesicle at the plasma membrane. To approximate this environment, we show that fluorescently labeled Gβγ interacts specifically with lipid-embedded t-SNAREs consisting of full-length syntaxin 1 and SNAP-25B at the membrane, as measured by fluorescence polarization. Fluorescently labeled syt1 undergoes competition with Gβγ for SNARE-binding sites in lipid environments. Mutant Gβγ subunits that were previously shown to be more efficacious at inhibiting Ca 2+ -triggered exocytotic release than wild-type Gβγ were also shown to bind SNAREs at a higher affinity than wild type in a lipid environment. These mutant Gβγ subunits were unable to inhibit VGCC currents. Specific peptides corresponding to regions on Gβ and Gγ shown to be important for the interaction disrupt the interaction in a concentration-dependent manner. In in vitro fusion assays using full-length t- and v-SNAREs embedded in liposomes, Gβγ inhibited Ca 2+ /synaptotagmin-dependent fusion. Together, these studies demonstrate the importance of these regions for the Gβγ-SNARE interaction and show that the target of Gβγ, downstream of VGCC, is the membrane-embedded SNARE complex.","is_dataset_classified":null,"base_score":3.6888794541139363,"endowment":3.6888794541139363,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"28515322","pmcid":"PMC5519367","openalex_id":"https://openalex.org/W2615728852","authors":[],"funders":[{"funder_name":"National Institute of Neurological Disorders and Stroke","grant_id":"R01NS052446","title":null},{"funder_name":"National Eye Institute","grant_id":"R01EY010291","title":null},{"funder_name":"National Institute of Mental Health","grant_id":"R01MH101679","title":null},{"funder_name":"National Institute of Mental Health","grant_id":"R01MH061876","title":null},{"funder_name":"National Institute of Mental Health","grant_id":"RO1MH084874","title":null},{"funder_name":"NIDDK NIH HHS","grant_id":"R01 DK109204","title":null},{"funder_name":"NIMH NIH HHS","grant_id":"R01 MH084874","title":null}],"total_grants":7,"fwci":2.2102,"citation_percentile":0.87372642,"influential_citations":0,"citation_trend":[{"year":2018,"count":9},{"year":2019,"count":5},{"year":2020,"count":5},{"year":2021,"count":4},{"year":2022,"count":5},{"year":2023,"count":3},{"year":2024,"count":2},{"year":2025,"count":5},{"year":2026,"count":1}],"oa_status":"hybrid","license":"cc-by","oa_locations":[{"url":"http://www.jbc.org/article/S0021925820429874/pdf","host_type":"journal"},{"url":"http://www.jbc.org/article/S0021925820429874/pdf","host_type":"publisher"},{"url":"https://api.elsevier.com/content/article/PII:S0021925820429874?httpAccept=text/xml","host_type":"publisher"},{"url":"https://api.elsevier.com/content/article/PII:S0021925820429874?httpAccept=text/plain","host_type":"publisher"},{"url":"https://syndication.highwire.org/content/doi/10.1074/jbc.M116.773523","host_type":"publisher"},{"url":"https://doi.org/10.1074/jbc.m116.773523","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/28515322","host_type":"repository"},{"url":"http://europepmc.org/pmc/articles/PMC5519367","host_type":"repository"},{"url":"https://www.ncbi.nlm.nih.gov/pmc/articles/5519367","host_type":"repository"}],"fields_of_study":["Cellular transport and secretion","Lipid Membrane Structure and Behavior","Pancreatic function and diabetes","Animals","Binding, Competitive","Calcium Signaling","Cattle","Cell Line","GTP-Binding Protein beta Subunits","GTP-Binding Protein gamma Subunits","Humans","Lipid Bilayers","Liposomes","Membrane Fusion","Models, Molecular","Mutation","Nerve Tissue Proteins","Peptide Fragments","Protein Conformation","Protein Interaction Domains and Motifs","Protein Multimerization","Rats","Recombinant Fusion Proteins","Recombinant Proteins","Synaptosomal-Associated Protein 25","Synaptotagmin I","Syntaxin 1"],"mesh_terms":["Animals","Binding, Competitive","Cattle","Cell Line","Humans","Lipid Bilayers","Liposomes","Membrane Fusion","Models, Molecular","Mutation","Nerve Tissue Proteins","Peptide Fragments","Protein Conformation","Recombinant Fusion Proteins","Recombinant Proteins","Calcium Signaling","GTP-Binding Protein beta Subunits","GTP-Binding Protein gamma Subunits","Synaptosomal-Associated Protein 25","Syntaxin 1","Synaptotagmin I","Rats","Protein Interaction Domains and Motifs","Protein Multimerization"],"keywords":["Synaptotagmin 1","Vesicle fusion","Lipid bilayer fusion","SNAP25","Membrane","Vesicle","Cell biology","Fusion","Chemistry","Synaptic vesicle","Biophysics","Biology","Biochemistry","Exocytosis","G protein","Neurotransmitter release","Snare Proteins","G Protein-coupled Receptor (Gpcr)"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Clean water and sanitation"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[{"name":"gen"}],"source":"live","citation_network_status":"fetched"},"created_at":"2026-08-12T02:28:50.540861Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}