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Related Experiment Videos

The structural GDP/GTP cycle of human Arf6.

S Pasqualato1, J Ménétrey, M Franco

  • 1Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, 1, avenue de la Terrasse, 91198 Gif sur Yvette cedex and Institut de Pharmacologie Moléculaire et Cellulaire, CNRS, 660 route des Lucioles, 06560 Valbonne, France.

EMBO Reports
|March 27, 2001
PubMed
Summary

The crystal structure of active Arf6 reveals its similarity to Arf1, suggesting differences in Arf protein interactions lie outside their switch regions. This finding offers insights into Arf protein function and regulation.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cell Biology

Background:

  • ADP-ribosylation factor 6 (Arf6) regulates plasma membrane traffic and cytoskeleton organization.
  • Arf proteins share highly similar switch regions, crucial for regulator and effector interactions.
  • Understanding Arf isoform specificity is key to deciphering their distinct cellular roles.

Purpose of the Study:

  • To determine the crystal structure of full-length, non-myristoylated human Arf6 bound to GTPgammaS.
  • To compare the structure of active Arf6 with other Arf family members, particularly Arf1.
  • To elucidate the structural basis for Arf isoform specificity and Arf protein function.

Main Methods:

  • X-ray crystallography of full-length human Arf6.
  • Co-crystallization with GTPgammaS.

Related Experiment Videos

  • Structural comparison with GDP-bound and other active Arf proteins.

    • Main Results:

    • The crystal structure of active Arf6 (bound to GTPgammaS) was determined.
    • Active Arf6 exhibits significant structural similarity to active Arf1.
    • Differences in Arf isoform recognition likely involve regions outside the highly conserved switch regions.

    Conclusions:

    • Arf6 and Arf1 share similar structures in their active, GTP-bound states.
    • The switch regions are not the primary determinants of specificity between active Arf isoforms.
    • GTP-bound Arfs may be recognized through interactions outside the switch regions or within their cellular context.
    • Structural insights are provided into the low intrinsic GTPase activity of Arf proteins.