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Cytoskeletal Accessory Proteins

The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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Fusion of Secretory Vesicles with the Plasma Membrane01:26

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Complexin cross-links prefusion SNAREs into a zigzag array.

Daniel Kümmel1, Shyam S Krishnakumar, Daniel T Radoff

  • 1Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, USA.

Nature Structural & Molecular Biology
|July 26, 2011
PubMed
Summary
This summary is machine-generated.

Complexin protein inhibits neurotransmitter release by binding to SNARE complexes. Its structure reveals a zigzag arrangement that prevents membrane fusion, ensuring precise synaptic signaling.

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Area of Science:

  • Molecular Neuroscience
  • Structural Biology
  • Cellular Signaling

Background:

  • Neurotransmitter release is mediated by SNARE proteins, a process tightly regulated to ensure synaptic fidelity.
  • Complexin acts as a crucial inhibitor of SNARE-mediated fusion, preventing premature release of neurotransmitters.
  • The precise structural mechanism by which complexin inhibits SNARE complex assembly and function remains incompletely understood.

Purpose of the Study:

  • To elucidate the structural basis of complexin's inhibitory mechanism on SNARE-mediated membrane fusion.
  • To determine the atomic-level interactions between complexin and a prefusion SNARE complex.
  • To understand how complexin's unique topology prevents the final zippering step required for vesicle fusion.

Main Methods:

  • Determined the crystal structure of complexin bound to a prefusion SNAREpin mimetic.
  • Utilized structural analysis to identify the binding sites and orientations of complexin's helical domains.
  • Investigated the intermolecular interactions governing complexin's inhibitory function within the SNARE complex.

Main Results:

  • Complexin's central helix anchors to one SNARE complex, while its accessory helix bridges to a second SNARE complex.
  • The accessory helix occupies the binding site of the final v-SNARE segment, preventing complete SNARE complex assembly.
  • Complexin induces a zigzag topology of SNARE complexes, which is structurally incompatible with the apposition of vesicle and plasma membranes.

Conclusions:

  • Complexin inhibits SNARE-mediated fusion not by direct competition with v-SNARE, but by organizing SNAREs into a non-fusogenic zigzag conformation.
  • This structural arrangement effectively blocks the final steps of membrane fusion, ensuring regulated neurotransmitter release.
  • The findings provide critical insights into the molecular machinery controlling synaptic exocytosis and neurotransmission.