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Application of Genetically Encoded Fluorescent Nitric Oxide (NO•) Probes, the geNOps, for Real-time Imaging of NO• Signals in Single Cells
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Deciphering the binding of caveolin-1 to client protein endothelial nitric-oxide synthase (eNOS): scaffolding

Andy E Trane1, Dmitri Pavlov, Arpeeta Sharma

  • 1From the St. Paul's Hospital's Centre of Heart and Lung Innovation.

The Journal of Biological Chemistry
|March 21, 2014
PubMed

Insights

Caveolin-1 (Cav-1) gene inactivation causes cardiovascular issues by disrupting endothelial nitric oxide synthase (eNOS) interaction. A specific Cav-1 peptide (90-99) was identified to enhance nitric oxide (NO) bioavailability.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Caveolin-1 (Cav-1) gene inactivation leads to cardiovascular and pulmonary complications.
  • Blunted Cav-1/endothelial nitric-oxide synthase (eNOS) interaction in vascular endothelial cells is linked to these complications.
  • Cav-1 normally binds and inhibits eNOS via its scaffolding domain (CAV; amino acids 82-101).

Purpose of the Study:

  • To identify the specific domain within CAV responsible for eNOS binding.
  • To elucidate the mechanism of eNOS inhibition by Cav-1.
  • To investigate the therapeutic potential of targeting the Cav-1/eNOS interaction.

Main Methods:

  • Characterization of Cav-1 mutants and peptide subsequences.
  • Binding affinity studies (Kd = 49 nM) for the identified CAV subsequence (90-99).
  • Computer modeling of CAV(90-99) docking to eNOS.
  • Gene silencing and cell reconstitution systems for peptide delivery.

Main Results:

  • A 10-amino acid CAV subsequence (90-99) was identified as the primary eNOS binding site.
  • Computer modeling revealed how Phe-92 within CAV mediates eNOS inhibition.
  • Intracellular delivery of a F92A CAV(90-99) peptide enhanced NO bioavailability in an eNOS- and Cav-1-dependent manner.

Conclusions:

  • The study provides the first detailed analysis of Cav-1 binding to eNOS.
  • The identified CAV(90-99) subsequence is crucial for Cav-1/eNOS interaction and NO regulation.
  • Targeting the Cav-1/eNOS interaction with specific peptides shows potential for therapeutic intervention in cardiovascular diseases.
Keywords:
CaveolaeCaveolinEndotheliumNitric OxideNitric-oxide Synthase

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