Distinct endocytic pathways control the rate and extent of synaptic vesicle protein recycling - PubMed (original) (raw)
Distinct endocytic pathways control the rate and extent of synaptic vesicle protein recycling
Susan M Voglmaier et al. Neuron. 2006.
Free article
Abstract
Synaptic vesicles have been proposed to form through two mechanisms: one directly from the plasma membrane involving clathrin-dependent endocytosis and the adaptor protein AP2, and the other from an endosomal intermediate mediated by the adaptor AP3. However, the relative role of these two mechanisms in synaptic vesicle recycling has remained unclear. We now find that vesicular glutamate transporter VGLUT1 interacts directly with endophilin, a component of the clathrin-dependent endocytic machinery. In the absence of its interaction with endophilin, VGLUT1 recycles more slowly during prolonged, high-frequency stimulation. Inhibition of the AP3 pathway with brefeldin A rescues the rate of recycling, suggesting a competition between AP2 and -3 pathways, with endophilin recruiting VGLUT1 toward the faster AP2 pathway. After stimulation, however, inhibition of the AP3 pathway prevents the full recovery of VGLUT1 by endocytosis, implicating the AP3 pathway specifically in compensatory endocytosis.
Comment in
- Rustling synaptic vesicle cargo after exocytosis.
Grabner C, Zenisek D. Grabner C, et al. Neuron. 2006 Jul 6;51(1):3-5. doi: 10.1016/j.neuron.2006.06.015. Neuron. 2006. PMID: 16815324 Review.
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