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Synaptotagmin controls and modulates synaptic-vesicle fusion in a Ca(2+)-dependent manner
1Howard Hughes Medical Institute, Dept of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.
Trends in Neurosciences
|April 1, 1995
Summary
Synaptotagmin acts as a crucial calcium (Ca2+) sensor, linking calcium influx to neurotransmitter release at the synapse. This protein converts the cellular secretory pathway into a Ca2+-regulated exocytotic pathway.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- The molecular mechanisms coupling Ca2+ influx to neurotransmitter release at synapses remain unclear.
- Several proteins have been proposed as potential Ca2+ sensors for exocytosis.
Purpose of the Study:
- To investigate the role of synaptotagmin as a Ca2+ sensor in neurotransmitter release.
Main Methods:
- Electrophysiological studies
- Biochemical analyses
- Genetic experiments in model organisms (C. elegans, Drosophila, mouse)
Main Results:
- Synaptotagmin exhibits properties consistent with a Ca2+ receptor.
- Genetic studies in multiple species highlight synaptotagmin's essential role in neurotransmitter release.
Conclusions:
- Synaptotagmin is identified as a key Ca2+ sensor protein.
- Synaptotagmin mediates the conversion of the cellular secretory pathway into a Ca2+-regulated exocytotic process.