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Related Experiment Video

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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
12:05

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies

Published on: March 6, 2013

Mapping peptide hormone-receptor interactions using a disulfide-trapping approach.

Paul Monaghan1, Beena E Thomas, Iwona Woznica

  • 1Department of Physiology, Tufts University School of Medicine, Boston, Massachusetts 02111, USA.

Biochemistry
|May 8, 2008
PubMed
Summary

Disulfide trapping offers a refined method to map parathyroid hormone (PTH) interactions with its receptor (PTHR1), surpassing limitations of previous cross-linking techniques. This approach reveals new interaction sites, enabling more accurate molecular models of the PTH-PTHR1 complex.

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Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

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11:44

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

Published on: October 2, 2018

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Parathyroid hormone (PTH) and its receptor (PTHR1) interaction is crucial for bone and mineral metabolism.
  • Previous studies utilized benzoylphenylalanine (Bpa) photoaffinity cross-linking to map this interface.
  • Bpa-based methods have limitations in resolution due to ligand flexibility and size.

Purpose of the Study:

  • To introduce and validate a disulfide-trapping approach for mapping PTH-PTHR1 interactions.
  • To overcome the resolution limits of Bpa cross-linking.
  • To generate a more refined molecular model of the PTH-PTHR1 complex.

Main Methods:

  • A disulfide-trapping strategy involving cysteine substitutions in PTH and PTHR1 was employed.
  • Ligand binding induces disulfide bond formation between proximal cysteines.
  • Disulfide bond formation geometry provides more constrained interaction data than Bpa cross-linking.

Main Results:

  • Disulfide trapping identified 4 interaction sites in PTHR1, compared to 1 site with Bpa cross-linking.
  • A PTH analogue with cysteine at position 1 was used to probe 24 sites in PTHR1.
  • New interaction sites refined molecular dynamics simulations for an updated PTH-PTHR1 complex model.

Conclusions:

  • Disulfide trapping is a powerful complementary technique to photoaffinity cross-linking for mapping peptide-receptor interfaces.
  • This method provides higher resolution insights into ligand-receptor interactions.
  • It facilitates the generation of more accurate molecular models for various peptide-receptor systems.