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Conformity01:20

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Related Experiment Video

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A two-step probing method to compare lysine accessibility across macromolecular complex conformations.

Andrew J MacRae1,2, Patricia Coltri1,3, Eva Hrabeta-Robinson1

  • 1Department of Molecular, Cell and Developmental Biology, University California , Santa Cruz , USA.

RNA Biology
|June 20, 2019
PubMed
Summary

This study introduces a chemical probing method to map lysine residue reactivity in large molecular complexes. This technique provides crucial biochemical insights into structural rearrangements, complementing cryo-electron microscopy models.

Keywords:
Chemical probingRNA protein complexlysinemass spectrometry

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Advances in cryo-electron microscopy (cryo-EM) enable structural determination of large, dynamic molecular complexes.
  • High-resolution models of complex biological assemblies are often limited, hindering understanding of functional transitions.
  • Orthogonal biochemical data is essential for elucidating the molecular interactions driving conformational changes.

Purpose of the Study:

  • To develop and validate a novel two-step chemical probing method for assessing lysine residue reactivity in macromolecular complexes.
  • To demonstrate the utility of this method in understanding protein-RNA interactions and conformational dynamics.
  • To provide a biochemical approach for contextualizing structural models obtained by cryo-EM and X-ray crystallography.

Main Methods:

  • A two-step chemical probing strategy targeting lysine residues in purified macromolecular complexes.
  • Detection of modified lysine residues using tandem mass spectrometry (MS/MS).
  • Application of the method to the *E. coli* 30S ribosomal subunit and human spliceosomes.

Main Results:

  • Lysine reactivity patterns quantitatively correlate with existing X-ray crystallography-derived structural models of the *E. coli* 30S ribosome.
  • The method successfully identified distinct lysine reactivity profiles across three different human spliceosome conformations.
  • Demonstrated the method's effectiveness in revealing structural rearrangements and protein-RNA interaction dynamics.

Conclusions:

  • The chemical probing method offers a powerful biochemical approach to complement structural studies of macromolecular complexes.
  • This technique is particularly valuable for investigating ribonucleoprotein complexes and changes in protein-RNA interactions.
  • The method aids in interpreting architectural rearrangements observed in intermediate-resolution cryo-EM structures solved in multiple conformations.