Related Experiment Videos
SNAP receptors implicated in vesicle targeting and fusion
T Söllner1, S W Whiteheart, M Brunner
1Rockefeller Research Laboratory, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.
Nature
|March 25, 1993
Summary
N-ethylmaleimide-sensitive fusion protein (NSF) and soluble NSF attachment proteins (SNAPs) are key for intracellular membrane fusion. Researchers identified SNAP receptors (SNAREs) in the brain, revealing their role in specific vesicle docking and neurotransmitter release.
Area of Science:
- Cell Biology
- Neuroscience
- Molecular Biology
Background:
- Intracellular membrane fusion is vital for cellular processes, including neurotransmitter release.
- N-ethylmaleimidesensitive factor (NSF) and soluble NSF attachment proteins (SNAPs) are implicated as essential components of this fusion machinery.
Purpose of the Study:
- To identify and characterize the targets of NSF and SNAPs involved in intracellular membrane fusion.
- To elucidate the role of these target proteins in vesicle docking and specificity.
Main Methods:
- Affinity purification was employed, utilizing the natural binding interactions between NSF/SNAPs and their targets.
- Proteins were isolated from bovine brain tissue.
Main Results:
- Four principal proteins, designated SNAP receptors (SNAREs), were successfully isolated.
- All identified SNAREs were associated with the synapse, with distinct types found on synaptic vesicles and the plasma membrane.
- Evidence suggests SNAREs mediate specific vesicle-to-target recognition.
Conclusions:
- NSF and SNAPs, along with specific SNAREs, form a conserved apparatus for intracellular vesicle fusion.
- SNAREs play a critical role in ensuring the specificity of vesicle docking to target membranes.
- This mechanism is likely fundamental to both constitutive and regulated fusion processes, including neurotransmission.