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Title | NSF-mediated disassembly of on- and off-pathway SNARE complexes and inhibition by complexin. |
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Journal, issue, pages | Elife, Vol. 7, Year 2018 |
Publish date | Jul 9, 2018 |
Authors | Ucheor B Choi / Minglei Zhao / K Ian White / Richard A Pfuetzner / Luis Esquivies / Qiangjun Zhou / Axel T Brunger / |
PubMed Abstract | SNARE complex disassembly by the ATPase NSF is essential for neurotransmitter release and other membrane trafficking processes. We developed a single-molecule FRET assay to monitor repeated rounds of ...SNARE complex disassembly by the ATPase NSF is essential for neurotransmitter release and other membrane trafficking processes. We developed a single-molecule FRET assay to monitor repeated rounds of NSF-mediated disassembly and reassembly of individual SNARE complexes. For ternary neuronal SNARE complexes, disassembly proceeds in a single step within 100 msec. We observed short- (<0.32 s) and long-lived (≥0.32 s) disassembled states. The long-lived states represent fully disassembled SNARE complex, while the short-lived states correspond to failed disassembly or immediate reassembly. Either high ionic strength or decreased αSNAP concentration reduces the disassembly rate while increasing the frequency of short-lived states. NSF is also capable of disassembling anti-parallel ternary SNARE complexes, implicating it in quality control. Finally, complexin-1 competes with αSNAP binding to the SNARE complex; addition of complexin-1 has an effect similar to that of decreasing the αSNAP concentration, possibly differentially regulating cis and trans SNARE complexes disassembly. |
External links | Elife / PubMed:29985126 / PubMed Central |
Methods | EM (single particle) |
Resolution | 7.0 Å |
Structure data | EMDB-8944: |