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Selecting Conformational Ensembles Using Residual Electron and Anomalous Density (READ).

Loïc Salmon1, Logan S Ahlstrom2,3, James C A Bardwell2,3

  • 1Centre de RMN à Très Hauts Champs, Institut des Sciences Analytiques, UMR 5280, CNRS, ENS Lyon, UCB Lyon 1, Université de Lyon, Villeurbanne, France. loic.salmon@cnrs.fr.

Methods in Molecular Biology (Clifton, N.J.)
|April 2, 2018
PubMed
Summary

Researchers developed a new method combining X-ray crystallography and ensemble selection to visualize dynamic biomolecular complexes. This approach, called residual electron and anomalous density (READ), reveals structural ensembles of protein-protein interactions within crystals.

Keywords:
Conformational dynamicsCrystallographyEnsembleProtein structureStructural biology

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Biophysics

Background:

  • Dynamic biomolecular complexes are crucial for cellular functions.
  • Experimental characterization of their structural ensembles is challenging.
  • Existing methods struggle to capture the heterogeneity and dynamics of these complexes.

Purpose of the Study:

  • To develop a novel hybrid methodology for determining structural ensembles of heterogeneous biomolecular complexes.
  • To enable visualization of dynamic conformational ensembles within crystalline structures.
  • To provide a detailed protocol for the READ method.

Main Methods:

  • Integration of X-ray crystallography with ensemble selection techniques from NMR studies.
  • Development of a selection scheme to identify conformations maximizing agreement with X-ray data.
  • Application of the residual electron and anomalous density (READ) method.

Main Results:

  • Successful visualization of heterogeneous conformational ensembles of biomolecular complexes within crystals.
  • Demonstration of READ's capability to provide high-resolution structural insights.
  • Establishment of a detailed protocol for constructing READ ensembles.

Conclusions:

  • The READ method offers a general approach for studying dynamic protein-protein complexes.
  • This hybrid technique overcomes experimental limitations in characterizing complex structural ensembles.
  • READ provides high-resolution views of dynamic biological systems.