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CB1 cannabinoid receptor-phosphorylated fourth intracellular loop structure-function relationships.

Khalil Eldeeb1,2, Anjali D Ganjiwale3, Indu R Chandrashekaran4

  • 1Wake Forest University Health Sciences, Winston-Salem, NC, USA.

Peptide Science (Hoboken, N.J.)
|May 16, 2020
PubMed
Summary
This summary is machine-generated.

Phosphorylation of serine residues in the CB1 cannabinoid receptor

Keywords:
BradykininG protein-coupled receptors (GPCR)endocannabinoidpepducinphosphorylationprotein kinase C (PKC)

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Area of Science:

  • Molecular pharmacology
  • Cellular signaling
  • Protein structure and function

Background:

  • The CB1 cannabinoid receptor's intracellular loop 4 (IL4) contains three key serine residues.
  • Understanding modifications to IL4 is crucial for receptor signaling.
  • Phosphorylation is a key post-translational modification affecting protein function.

Purpose of the Study:

  • To investigate the impact of serine phosphorylation on the CB1 IL4 peptide's conformation.
  • To determine how phosphorylation affects the peptide's cellular signaling capabilities.
  • To explore the physiological relevance of serine phosphorylation in CB1 receptor function.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy to study peptide conformation.
  • Circular dichroism (CD) spectroscopy to assess structural changes.
  • G protein activation assays ([35S]GTPγS binding) and cAMP production assays.

Main Results:

  • Phosphorylation induced helical structures in the IL4 peptide, with varying degrees depending on the serine residue phosphorylated.
  • Helical content followed the order: IL4pSer411 > IL4pSer415 > IL4 > IL4pSer402.
  • Phosphorylated IL4 peptides showed increased efficacy in activating G proteins (Go, Gi3) and inhibiting cAMP accumulation, correlating with helicity.

Conclusions:

  • Phosphorylation of serine residues in CB1 IL4 peptides alters their helical structure.
  • These phosphorylation-dependent structural changes enhance the efficacy of G protein signaling.
  • Serine phosphorylation may be a physiologically relevant modification for CB1 receptor function in vivo.