Single-Molecule Studies of the Neuronal SNARE Fusion Machinery
Open accessAbstract
SNAREs are essential components of the machinery for Ca 2+-triggered fusion of synaptic vesicles with the plasma membrane, resulting in neurotransmitter release into the synaptic cleft. Although much is known about their biophysical and structural properties and their interactions with accessory proteins such as the Ca 2+ sensor synaptotagmin, their precise role in membrane fusion remains an enigma. Ensemble studies of liposomes with reconstituted SNAREs have demonstrated that SNAREs and accessory proteins can trigger lipid mixing/fusion, but the inability to study individual fusion events has precluded molecular insights into the fusion process. Thus, this field is ripe for studies with single-molecule methodology. In this review, we discuss applications of single-molecule approaches to observe reconstituted SNAREs, their complexes, associated proteins, and their effect on biological membranes. Some of the findings are provocative, such as the possibility of parallel and antiparallel SNARE complexes or of vesicle docking with only syntaxin and synaptobrevin, but have been confirmed by other experiments.
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Munc13 opens syntaxin-1, allowing trans-zippering of SNAREs from the N- to C-terminals and formation of a 4-helix trans-complex or ternary complex.
“Munc13 opens syntaxin-1 (407), allowing the trans-zippering of the SNAREs in the plasma and granular membranes from the N- to the C-terminals (which are anchored to the membrane). This leads to the formation of a 4-helix trans-complex, also referred to as the ‘ternary complex’ (100) (Figure 16B, step ii).”
From Pancreatic β-Cell Electrical Activity and Insulin Secretion: Of Mice and Men (2018) · cites this paper as [100]
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Crystal structure of a SNARE complex involved in synaptic exocytosis at 2.4 Å resolution
Sutton, R. B., Fasshauer, D., Jahn, R., & Brunger, A. T. (1998) · Nature · doi:10.1038/26412 · Cited by 2,417 · cited 4× · see citing works
“SNAREs undergo progressive disorder-to-order transitions upon interactions with binding partners, culminating with the fully folded ternary SNARE complex, consisting of an elongated four-helix bundle (49)”
BackgroundInfluentialMolecular anatomy of a trafficking organelle
Takamori, S., Holt, M., Stenius, K., Lemke, E. A., Grønborg, M., Riedel, D., Urlaub, H., Schenck, S., Brügger, B., Ringler, P., et al. (2006) · Cell · doi:10.1016/j.cell.2006.10.030 · Cited by 2,373 · see citing works
Differential Control of the Releasable Vesicle Pools by SNAP-25 Splice Variants and SNAP-23
Sørensen, J. B., Nagy, G., Varoqueaux, F., Nehring, R. B., Brose, N., Wilson, M. C., & Neher, E. (2003) · Cell · doi:10.1016/s0092-8674(03)00477-x · Cited by 364 · see citing works
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Cited by
Sorted by citations
Pancreatic β-Cell Electrical Activity and Insulin Secretion: Of Mice and Men
Rorsman, P., & Ashcroft, F. M. (2018) · Physiological Reviews · doi:10.1152/physrev.00008.2017 · Cited by 793 · see citing works
- Authors
- Brunger, A. T., Weninger, K., Bowen, M., & Chu, S.
- Affiliations
- The Howard Hughes Medical Institute and Departments of Molecular and Cellular Physiology, Neurology and Neurological Sciences, Structural Biology, and Photon Science, Stanford University, California 94305;
- North Carolina State University (US)
- Stony Brook University Hospital (US)
- United States Department of Energy (US)
- Venue
- Annual Review of Biochemistry
- Publisher
- Annual Reviews
- Published
- 2009-06-01
- Volume
- 78
- Issue
- 1
- Pages
- 903-928
- ISSN
- 0066-4154 (ISSN-L)
- 1545-4509
- PMC
- PMC2854664
- OpenAlex
- W2134371594
- Cited by
- 107
- References
- 4
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 4 · 2018: 4 · 2017: 5 · 2016: 5 · 2015: 9 · 2014: 10 · 2013: 11 · 2012: 10
- FWCI
- 1.04
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Annual Review of Biochemistry (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Howard Hughes Medical Institute
- National Institute of Mental Health (1-R01-MH63105, MH 081923-01, R01MH081923, R37MH063105, R01MH063105)
- National Institute of General Medical Sciences (R21GM076039, GM 076039)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- SNARE proteins, synaptic vesicle fusion, neurotransmitter release, synaptotagmin, syntaxin, synaptobrevin, single-molecule analysis, lipid mixing, membrane fusion, vesicle docking
- MeSH terms
- Animals, Fluorescence, Humans, Neurons, Spectrum Analysis, Microscopy, Atomic Force, SNARE Proteins, Synaptotagmins
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