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Related Experiment Videos

GIP, a G-protein-coupled receptor interacting protein.

Giulio Innamorati1, Michael Insuk Whang, Raffaella Molteni

  • 1Scientific Institute San Raffaele, Universtita' Vita-Salute, Milan, Italy. giulio.innamorati@hsr.it

Regulatory Peptides
|November 1, 2002
PubMed
Summary

Researchers discovered a new protein, G-protein-coupled receptor Interacting Protein (GIP), that interacts with the V2 vasopressin receptor. This transmembrane protein is located on the plasma membrane and interacts with intracellular proteins.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The V2 vasopressin receptor (V2R) plays a crucial role in regulating water balance.
  • Understanding V2R interactions is key to deciphering its signaling pathways.

Purpose of the Study:

  • To identify and characterize novel proteins interacting with the V2R.
  • To elucidate the structure and function of the identified interacting protein.

Main Methods:

  • Protein cloning and gene localization.
  • Immunocytochemistry and biotinylation assays for subcellular localization.
  • Pull-down experiments to confirm protein interactions.
  • Sequence homology analysis for structural inference.

Main Results:

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  • A novel protein, G-protein-coupled receptor Interacting Protein (GIP), was identified interacting with V2R.
  • GIP gene is located on chromosome 17, encoding a 379-amino-acid protein.
  • GIP is a transmembrane protein, localized to the plasma membrane, likely as a trimer.
  • The cytosolic domain of GIP features a collagen-like helix and a globular domain that interacts with V2R and other cytosolic proteins.

Conclusions:

  • GIP is a novel V2R-interacting protein with a unique transmembrane structure.
  • The globular domain of GIP is critical for its interaction with V2R and intracellular signaling partners.
  • GIP represents a new target for understanding V2R-mediated cellular processes.