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Updated: Nov 4, 2025

Translating Ribosome Affinity Purification TRAP to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale
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TRAPP structures reveal the big picture.

Benjamin S Glick1

  • 1Department of Molecular Genetics and Cell Biology, The University of Chicago, Chicago, IL, USA.

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|May 21, 2021
PubMed
Summary
This summary is machine-generated.

New structures reveal how the TRAnsport Protein Particle (TRAPP) complex recognizes its Rab protein substrates. These findings advance understanding of Golgi function and protein transport mechanisms.

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • The TRAnsport Protein Particle (TRAPP) complexes are essential for Golgi apparatus function.
  • TRAPP complexes regulate vesicular transport by activating Rab GTPases.
  • TRAPPIII specifically activates Ypt1 in yeast and Rab1 in metazoans.

Purpose of the Study:

  • To elucidate the structural basis of TRAPPIII-Rab protein recognition.
  • To understand the mechanism of Rab protein activation by TRAPPIII.
  • To investigate the structural diversity and membrane association of TRAPPIII complexes.

Main Methods:

  • X-ray crystallography to determine high-resolution structures of TRAPPIII complexes.
  • Biochemical assays to confirm protein-protein interactions and functional roles.
  • Comparative structural analysis between yeast and metazoan TRAPPIII.

Main Results:

  • Detailed structures reveal specific interactions between TRAPPIII and its Rab substrates (Ypt1/Rab1).
  • A membrane-anchoring mechanism for yeast TRAPPIII was identified.
  • The large subunits defining metazoan TRAPPIII were structurally characterized.

Conclusions:

  • Structural insights clarify how TRAPPIII achieves substrate specificity in Rab protein activation.
  • The findings provide a foundation for understanding TRAPPIII's role in Golgi trafficking.
  • These studies highlight conserved and divergent features of TRAPPIII across species.