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In Vivo Single-Molecule Tracking at the Drosophila Presynaptic Motor Nerve Terminal
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Exploring the conformational changes of the Munc18-1/syntaxin 1a complex.

Ioanna Stefani1, Justyna Iwaszkiewicz2, Dirk Fasshauer1

  • 1Department of Computational Biology, University of Lausanne, Lausanne, Switzerland.

Protein Science : a Publication of the Protein Society
|December 18, 2023
PubMed
Summary
This summary is machine-generated.

Munc18-1, crucial for neurotransmitter release, appears to facilitate syntaxin-1a

Keywords:
Munc13Munc18‐1SM proteinSNARE proteinneuronal secretionsynaptobrevinsyntaxin‐1a

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Neurotransmitter release relies on membrane fusion, driven by SNARE complex formation.
  • Munc18-1 binds syntaxin-1a, inhibiting SNARE complex assembly but is vital for neurotransmission.
  • The mechanism by which Munc18-1 facilitates syntaxin-1a availability for SNARE complex formation remains unclear.

Purpose of the Study:

  • To biochemically investigate the structural rearrangements of the Munc18-1 and syntaxin-1a complex.
  • To understand how Munc18-1 enables syntaxin-1a to participate in SNARE complex formation.

Main Methods:

  • Utilized site-directed mutagenesis to weaken the Munc18-1-syntaxin-1a complex.
  • Employed sequence and structural analysis, supported by molecular dynamics simulations.
  • Generated a homology model of the altered Munc18-1-syntaxin-1a conformation.

Main Results:

  • Identified specific mutations that induce structural rearrangements in the Munc18-1-syntaxin-1a complex.
  • Revealed a potentially more open conformation of syntaxin-1a while still bound to Munc18-1.
  • This altered conformation is proposed to allow initiation of SNARE complex formation.

Conclusions:

  • Munc18-1 likely induces a conformational change in syntaxin-1a, enabling SNARE complex assembly.
  • The study provides a structural basis for Munc18-1's essential role in neurotransmitter release.
  • Further research is needed to elucidate regulatory roles of other proteins in this process.