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Related Concept Videos

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Related Experiment Video

Updated: Jan 20, 2026

Imaging Neurons within Thick Brain Sections Using the Golgi-Cox Method
10:26

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Golgin45-Syntaxin5 Interaction Contributes to Structural Integrity of the Golgi Stack.

Neeraj Tiwari1, Morven Graham1, Xinran Liu1

  • 1Department of Cell Biology, Yale University School of Medicine, New Haven, CT, 06520, USA.

Scientific Reports
|August 30, 2019
PubMed
Summary

Golgin45 binds Syntaxin5, a novel interaction critical for Golgi structure. Disrupting this binding causes Golgi cisternal fusion, highlighting tether-SNARE roles in maintaining Golgi integrity.

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Related Experiment Videos

Last Updated: Jan 20, 2026

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Structural Biology

Background:

  • The Golgi apparatus's stacked structure is crucial for its function.
  • Golgin tethers and GRASP proteins are known regulators of Golgi morphology.
  • The specific role of Golgin45 in Golgi structure is not well understood.

Purpose of the Study:

  • To elucidate the functional role of Golgin45 in maintaining Golgi structure.
  • To identify novel binding partners of Golgin45.
  • To investigate the impact of Golgin45-Syntaxin5 interaction on Golgi morphology.

Main Methods:

  • Sequence homology analysis to identify potential binding domains.
  • Site-directed mutagenesis to disrupt Golgin45-Syntaxin5 interaction.
  • Pull-down assays with recombinant proteins.
  • Exogenous expression of Golgin45 mutants in HeLa cells.
  • Electron microscopy (EM) and EM tomography.
  • siRNA-mediated gene depletion.

Main Results:

  • Golgin45 was identified as a novel Syntaxin5-binding protein.
  • A leucine zipper-like motif in Golgin45 mediates Syntaxin5 binding.
  • A point mutation (D171A) abolished Golgin45-Syntaxin5 interaction but not Rab2-GTP binding.
  • Expression of the D171A mutant caused Golgi intercisternal fusion.
  • Depletion of Golgin tethers that bind Syntaxin5 also induced Golgi fusion.

Conclusions:

  • The interaction between Golgin45 and Syntaxin5 is essential for preventing Golgi intercisternal fusion.
  • Tether-SNARE interactions play a significant role in maintaining Golgi stack structural integrity.
  • This finding provides new insights into the molecular mechanisms governing Golgi organization.