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Neurexins are functional alpha-latrotoxin receptors
S Sugita1, M Khvochtev, T C Südhof
1Department of Molecular Genetics, Howard Hughes Medical Institute, The University of Texas Southwestern Medical Center, Dallas 75235, USA.
Neuron
|April 10, 1999
Summary
Alpha-latrotoxin, a neurotoxin, uses two receptors: CIRL/latrophilin 1 and neurexins. This study confirms neurexins are potent alpha-latrotoxin receptors, potentially amplifying toxin activity at active sites.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Alpha-latrotoxin is a potent neurotoxin that stimulates synaptic exocytosis.
- Two neuronal receptors, CIRL/latrophilin 1 (CL1) and neurexin-1alpha, have been identified for alpha-latrotoxin.
- The precise role of neurexin-1alpha in alpha-latrotoxin-induced exocytosis remains unclear.
Purpose of the Study:
- To investigate the function of neurexins as alpha-latrotoxin receptors.
- To compare the potency of neurexins and CL1 in binding alpha-latrotoxin.
- To elucidate the mechanism by which neurexins mediate alpha-latrotoxin's effects.
Main Methods:
- Experiments were conducted using PC12 cells.
- Neurexin function as alpha-latrotoxin receptors was assessed.
- The role of intracellular sequences in neurexin activity was examined.
Main Results:
- Neurexins were confirmed to be potent alpha-latrotoxin receptors, comparable to CL1.
- Both alpha- and beta-neurexins function as autonomous receptors.
- Alternative splicing regulates neurexin receptor activity.
- Truncated neurexins lacking intracellular domains were fully active.
Conclusions:
- Neurexins are significant neuronal receptors for alpha-latrotoxin.
- Alpha-latrotoxin uniquely employs two unrelated receptors (CL1 and neurexins) for enhanced recruitment.
- Neurexins and CL1 function in toxin recruitment, not exocytosis itself.