Journal
SCIENCE
Volume 334, Issue 6062, Pages 1565-1569Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1212991
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 665, SFB 958, EXC 257]
- Bundesministerium fur Bildung und Forschung (The German Federal Agency of Education and Research)
- Max Delbruck Center for Molecular Medicine
- Boehringer Ingelheim Fonds
- DFG [GRK 1123]
- Swiss National Science Foundation [PBSKP3-123456/1]
- Swiss National Science Foundation (SNF) [PBSKP3-123456] Funding Source: Swiss National Science Foundation (SNF)
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The molecular machinery mediating the fusion of synaptic vesicles (SVs) at presynaptic active zone (AZ) membranes has been studied in detail, and several essential components have been identified. AZ-associated protein scaffolds are viewed as only modulatory for transmission. We discovered that Drosophila Rab3-interacting molecule (RIM)-binding protein (DRBP) is essential not only for the integrity of the AZ scaffold but also for exocytotic neurotransmitter release. Two-color stimulated emission depletion microscopy showed that DRBP surrounds the central Ca(2+) channel field. In drbp mutants, Ca(2+) channel clustering and Ca(2+) influx were impaired, and synaptic release probability was drastically reduced. Our data identify RBP family proteins as prime effectors of the AZ scaffold that are essential for the coupling of SVs, Ca(2+) channels, and the SV fusion machinery.
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