Structural characterization of full-length NSF and 20S particles

Area of Science:

• Molecular Biology
• Cell Biology
• Structural Biology

Background:

• Intracellular vesicle fusion is vital for cellular processes.
• The 20S particle, comprising NSF, SNAPs, and SNARE complex, mediates vesicle fusion.
• Understanding NSF's mechanism in SNARE complex disassembly is key.

Purpose of the Study:

• To elucidate the structural basis of NSF function in vesicle fusion.
• To characterize the nucleotide-dependent conformational changes of NSF.
• To reveal the interaction between NSF and the SNARE complex.

Main Methods:

• Single-particle cryo-electron microscopy (cryo-EM)
• Negative stain electron microscopy (EM)
• Three-dimensional structure reconstruction

Main Results:

• Determined structures of NSF hexamer in ATPγS, ADP-AlFx, and ADP states.
• Revealed a parallel arrangement of NSF's D1 and D2 domains.
• Showcased the 20S particle's interaction with the SNARE complex at two distinct sites.

Conclusions:

• NSF undergoes nucleotide-dependent conformational changes.
• The 20S particle structure provides insights into SNARE complex disassembly by NSF.
• This study advances understanding of the molecular machinery governing vesicle fusion.