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Structural determinants for interaction with three different effectors on the G protein beta subunit

K Yan1, N Gautam

  • 1Department of, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

The Journal of Biological Chemistry
|January 24, 1997
PubMed
Summary
This summary is machine-generated.

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The G protein beta subunit

Area of Science:

  • Molecular Biology
  • Protein Structure
  • Signal Transduction

Background:

  • G protein beta subunits are crucial signaling molecules.
  • Specific domains of beta subunits interact with various effector proteins.

Purpose of the Study:

  • To investigate the structural determinants of G protein beta subunit interactions with effectors.
  • To elucidate the role of specific structural elements in beta1A interactions.

Main Methods:

  • Yeast two-hybrid system to assess protein-protein interactions.
  • Site-directed mutagenesis to create altered beta1A fragments.
  • Analysis of interaction profiles with adenylyl cyclase 2 (AC2), GIRK1, and PLC-beta2.

Main Results:

Related Experiment Videos

  • A beta1A N-terminal fragment (beta1A) interacts with AC2, GIRK1, and PLC-beta2.
  • Mutations disrupting the N-terminal alpha helix impaired gamma subunit interaction but not effector interactions.
  • Mutations disrupting beta sheet hydrogen bonds impaired GIRK1 and PLC-beta2 interactions but not AC2 or gamma subunit interactions.

    • Conclusions:

    • Proper folding of the first five beta strands in the G protein beta subunit is essential for GIRK1 and PLC-beta2 interaction.
    • Structural determinants for AC2 interaction differ from those for GIRK1 and PLC-beta2.