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The molecular mechanisms by which dense core vesicles (DCVs) translocate, tether, dock and prime are poorly understood. In this study, Caenorhabditis elegans was used as a model organism to study the function of Rab proteins and their effectors in DCV exocytosis. RAB-27/AEX-6, but not RAB-3, was found to be required for peptide release from neurons. By analyzing the movement of DCVs approaching the plasma membrane using total internal reflection fluorescence microscopy, we demonstrated that RAB-27/AEX-6 is involved in the tethering of DCVs and that its effector rabphilin/RBF-1 is required for the initial tethering and subsequent stabilization by docking.

RAB-27 and its effector RBF-1 regulate the tethering and docking steps of DCV exocytosis in C. elegans