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Updated: Nov 12, 2025

Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein GST-RhoAG17A from Epithelial Cell Lysates
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Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein GST-RhoAG17A from Epithelial Cell Lysates

Published on: March 31, 2012

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Natriuretic peptide receptor-C releases and activates guanine nucleotide-exchange factor H1 in a ligand-dependent

Mika Nishida1, Kenji Miyamoto1, Shogo Abe1

  • 1Department of Biological Science and Technology, Tokushima University Graduate School, Minamijosanjima-cho, Tokushima, 770-8506, Japan.

Biochemical and Biophysical Research Communications
|March 19, 2021
PubMed

Insights

Natriuretic peptide receptor-C (NPR-C) binds to GEF-H1, a protein regulating RhoA signaling. Ligands trigger GEF-H1 release and activation, suggesting NPR-C’s role in diverse physiological functions.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Endocrinology

Background:

  • Natriuretic peptide receptor-C (NPR-C) clears natriuretic peptides and inhibits adenylyl cyclase via Gαi.
  • The full physiological roles and intracellular signaling of NPR-C remain unclear.

Purpose of the Study:

  • To identify novel binding proteins and elucidate intracellular signaling pathways of NPR-C.
  • To investigate the interaction between NPR-C and GEF-H1.

Main Methods:

  • Co-immunoprecipitation assays to detect protein interactions.
  • Site-directed mutagenesis to identify interaction domains.
  • Ligand stimulation assays to observe dynamic protein interactions and signaling events.

Main Results:

  • GEF-H1 was identified as a novel binding protein for NPR-C.
  • NPR-C interaction with GEF-H1 depends on a specific 37-amino acid cytoplasmic region.
  • NPR-A, unlike NPR-C, did not interact with GEF-H1.
  • NPR-C ligands (ANP, CNP, osteocrin) induced GEF-H1 dissociation from NPR-C.
  • Osteocrin treatment phosphorylated GEF-H1, enhanced its 14-3-3 binding, and increased its activation.

Conclusions:

  • NPR-C regulates GEF-H1 signaling, indicating its involvement in diverse physiological roles beyond natriuretic peptide clearance.
  • The findings reveal a novel mechanism for NPR-C in modulating RhoA signaling pathways.

Keywords:
GEF-H1NPR-COsteocrinProtein-protein interaction

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