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Related Experiment Videos

Sea urchin vault structure, composition, and differential localization during development.

Phoebe L Stewart1, Miriam Makabi, Jennifer Lang

  • 1Department of Molecular Physiology and Biophysics, Vanderbilt University Medical Center, Nashville, TN, USA. phoebe.stewart@vanderbilt.edu

BMC Developmental Biology
|February 16, 2005
PubMed
Summary
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Sea urchin vaults, similar to mammalian ones, relocalize to the nucleus during development, suggesting a role in macromolecule transport.

Area of Science:

  • Cell Biology
  • Structural Biology
  • Developmental Biology

Background:

  • Vaults are conserved ribonucleoprotein assemblies in eukaryotes with an undetermined function.
  • The sea urchin (Strongylocentrotus purpuratus) is an invertebrate model organism evolutionarily closer to humans than other model organisms lacking vaults.
  • This study compares sea urchin and mammalian vault structures and analyzes vault distribution during sea urchin embryogenesis.

Purpose of the Study:

  • To compare the structure and composition of sea urchin vaults with their mammalian counterparts.
  • To investigate the subcellular localization of vaults during sea urchin embryogenesis.

Main Methods:

  • Sequence analysis of sea urchin major vault protein (MVP).
  • Cryoelectron microscopy (cryo-EM) for structural reconstruction of sea urchin vaults.

Related Experiment Videos

  • Confocal microscopy to track MVP localization during embryogenesis.

    • Main Results:

    • Sea urchin MVP shares significant sequence identity and structural features with rat MVP.
    • Cryo-EM revealed a barrel-shaped structure for sea urchin vaults, nearly identical to rat vaults.
    • Vaults were observed to relocalize from the cytoplasm to the nucleus during sea urchin development, with additional protein components potentially representing molecular cargo.

    Conclusions:

    • Sea urchin vaults exhibit structural and compositional similarities to mammalian vaults.
    • The developmental relocalization of vaults to the nucleus suggests a role in macromolecule transport during embryogenesis.