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Related Experiment Videos

Structural basis for myosin V discrimination between distinct cargoes.

Natasha Pashkova1, Yui Jin, S Ramaswamy

  • 1Department of Biochemistry, University of Iowa, Iowa City, IA 52242, USA.

The EMBO Journal
|January 27, 2006
PubMed
Summary

Myosin V motors transport cargo using their globular tails. Researchers discovered unique structures on the tail that bind specific cargo receptors, enabling distinct cellular transport functions.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Structural Biology

Background:

  • Myosin V molecular motors are essential for intracellular transport, moving various cargoes along actin filaments.
  • Cargoes are attached to the globular tail of myosin V through specific receptors, allowing for diverse transport functions.
  • A single myosin V motor can potentially transport multiple cargoes to different locations over time.

Purpose of the Study:

  • To determine the crystal structure of the myosin V globular tail.
  • To identify conserved regions on the myosin V tail surface as potential cargo-specific receptor attachment sites.
  • To investigate the structural basis for myosin V's ability to bind and transport distinct cargoes.

Main Methods:

  • X-ray crystallography was employed to determine the three-dimensional structure of the myosin V globular tail at 2.2 angstrom resolution.

Related Experiment Videos

  • Bioinformatic analysis was used to identify conserved surface residues on the myosin V tail.
  • Functional assays were performed to assess the role of identified conserved regions in cargo binding and transport.

    • Main Results:

    • The crystal structure of the myosin V globular tail revealed a novel tertiary structure.
    • Several surface patches of highly conserved residues were identified as candidate sites for cargo-specific receptor attachment.
    • Two distinct regions of conserved residues, located at opposite ends of the cargo-binding domain, were found to be crucial for specific cargo transport (vacuole inheritance vs. secretory vesicle movement).

    Conclusions:

    • The myosin V globular tail possesses a unique structure with distinct, spatially separated cargo-binding domains.
    • These spatially segregated binding sites suggest that organelle-specific myosin V receptors are key regulators of cargo attachment.
    • The findings provide structural insights into how myosin V achieves specificity in transporting different cellular cargoes.