"Data suggest that GTP-binding protein beta/gamma (Gb/g) heterodimers interact specifically with lipid-embedded neuronal t-SNARE proteins syntaxin 1A and SNAP-25B (synaptosomal-associated protein 25B); this binding is competitive with synaptotagmin 1 for binding sites on the t-SNARE proteins; Gb/g inhibits Ca2+/synaptotagmin 1-dependent membrane fusion."xsd:string