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Rigid Body Equilibrium Problems - II01:21

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Related Experiment Video

Updated: Jan 23, 2026

Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification BiCAP
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Modelling multi-protein complexes using PELDOR distance measurements for rigid body minimisation experiments using

Colin M Hammond1, Tom Owen-Hughes1, David G Norman2

  • 1Centre for Gene Regulation and Expression, University of Dundee, Dundee DD1 5EH, UK.

Methods (San Diego, Calif.)
|December 3, 2014
PubMed
Summary

This study introduces a method using Pulsed Electron Double Resonance (PELDOR) to determine the orientation of protein domains within larger complexes. It successfully models the Vps75 homotetramer structure, advancing protein structural biology.

Keywords:
ChromatinDEERMTSSLwizardPELDORVps75XPLOR-NIH

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Area of Science:

  • Structural Biology
  • Biophysics
  • Protein Science

Background:

  • While crystallographic and NMR methods reveal protein domain structures, their orientation in larger complexes remains challenging.
  • Understanding domain orientation is crucial for deciphering protein function within multi-domain polypeptides and complexes.

Purpose of the Study:

  • To develop and demonstrate a pipeline for modeling protein domain orientation using site-specific spin labeling and Pulsed Electron Double Resonance (PELDOR).
  • To model the quaternary structure of the histone chaperone Vps75, specifically the association of homodimers into homotetramers.

Main Methods:

  • Site-specific spin labeling of engineered cysteine residues on the histone chaperone Vps75.
  • Utilizing Pulsed Electron Double Resonance (PELDOR) to obtain distance measurements between spin labels.
  • Employing the XPLOR-NIH platform for computational modeling, incorporating experimental data and symmetry constraints.

Main Results:

  • A pipeline was established for modeling the location of spin labels on Vps75.
  • Experimental PELDOR measurements and symmetry constraints were successfully used to model the orientation of Vps75 homodimers within a homotetramer.
  • A structural model for the Vps75 homotetramer was generated, showcasing the utility of PELDOR in complex structural determination.

Conclusions:

  • PELDOR measurements combined with computational modeling provide a powerful approach for determining the orientation of protein domains in complexes.
  • The study presents a working example of generating a structural model for a protein complex (Vps75 homotetramer) using this integrated methodology.
  • This approach offers new insights into the functional implications of protein domain arrangements in larger biological assemblies.