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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

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Structural changes in DNA-binding proteins on complexation.

Sayan Poddar1, Devlina Chakravarty2, Pinak Chakrabarti1,2

  • 1Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata 700054, India.

Nucleic Acids Research
|March 14, 2018
PubMed
Summary
This summary is machine-generated.

Protein structural changes upon DNA binding differ significantly from protein-protein interactions. Unbound proteins often have disordered regions that become ordered upon DNA complexation, impacting binding site prediction.

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Area of Science:

  • Structural Biology
  • Bioinformatics
  • Molecular Recognition

Background:

  • Understanding protein-DNA interactions is crucial for molecular biology.
  • Protein structural dynamics influence DNA binding.
  • Predicting DNA-binding sites requires analyzing conformational changes.

Purpose of the Study:

  • To characterize and predict DNA-binding regions in proteins.
  • To compare structural changes in proteins upon DNA binding versus protein-protein interactions.
  • To investigate the role of protein flexibility in DNA recognition.

Main Methods:

  • Analysis of unbound (U) and bound (B) protein forms from a protein-DNA docking benchmark.
  • Comparison of solvent-accessible surface area (ASA) changes in interfaces.
  • Identification of missing residues and their contribution to buried surface area.
  • Assessment of secondary structure content variations (coil, helix, turn, strand).

Main Results:

  • Proteins exhibit greater structural changes upon DNA complexation than in protein-protein interactions, especially enzymes.
  • Protein-DNA interfaces show varied ASA changes, unlike protein-protein interactions.
  • Missing residues in unbound forms contribute significantly to buried surface area upon binding.
  • Disordered segments containing Lys, Gly, and Arg become ordered at the interface.
  • Secondary structure content shifts occur, with potential increases in coil and helix.

Conclusions:

  • Protein flexibility in the unbound state complicates the identification of DNA-binding residues.
  • Conformational changes, including ordering of disordered regions, are key features of protein-DNA recognition.
  • Accurate prediction of DNA-binding sites necessitates considering these dynamic structural alterations.