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Related Experiment Videos

The beta domain is required for Vps4p oligomerization into a functionally active ATPase.

Parimala R Vajjhala1, Julin S Wong, Hui-Yi To

  • 1Institute for Molecular Bioscience and ARC Special Research Centre for Functional and Applied Genomics, University of Queensland, St Lucia, Queensland, Australia.

The FEBS Journal
|May 18, 2006
PubMed
Summary

The Vps4 protein

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Endocytic and biosynthetic pathways converge at the prevacuolar endosomal compartment.
  • Multivesicular body (MVB) sorting is crucial for protein delivery to the lysosome/vacuole lumen.
  • Vps4, an AAA ATPase, is essential for MVB sorting and endosomal transport.

Purpose of the Study:

  • To investigate the in vivo roles of conserved motifs within the Vps4 protein's beta and AAA domains.
  • To elucidate the functional significance of Vps4's structural domains in endosomal trafficking.

Main Methods:

  • Site-directed mutagenesis of conserved motifs in yeast Vps4.
  • In vivo and in vitro functional assays to assess Vps4p activity.
  • Analysis of Vps4p interactions with itself (homotypic) and Vta1p.

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Main Results:

  • The Vps4 beta domain is dispensable for endosomal recruitment but essential for all Vps4p endocytic functions.
  • The beta domain is critical for Vps4p homotypic interaction and full ATPase activity.
  • Vps4p interaction with Vta1p is dependent on the beta domain.

Conclusions:

  • Assembly of a Vps4p oligomeric complex with full ATPase activity and Vta1p interaction is vital for endosome function.
  • The Vps4 beta domain plays a critical regulatory role in MVB sorting and endosomal trafficking.