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Related Experiment Video

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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Changes in protein structure at the interface accompanying complex formation.

Devlina Chakravarty1, Joël Janin2, Charles H Robert3

  • 1Department of Biochemistry, Bose Institute , P-1/12 CIT Scheme VIIM, Kolkata 700 054, India.

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|November 24, 2015
PubMed
Summary
This summary is machine-generated.

Protein complex formation alters interface structures, increasing solvent accessibility and reducing flexibility. Disordered regions in unbound proteins become ordered upon binding, impacting molecular recognition and protein docking strategies.

Keywords:
bioinformaticsbound and unbound protein formscrystallographic temperature factordisorder–order transitioninterface areamolecular recognitionprotein flexibilityprotein–protein interactionssecondary structure

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Computational Biology

Background:

  • Protein interactions are fundamental to all biological processes.
  • Understanding structural changes during complex formation is crucial for molecular recognition and docking algorithms.

Purpose of the Study:

  • To characterize structural changes at protein-protein interaction interfaces.
  • To compare unbound (U) and bound (B) protein forms to identify interface atom/residue modifications.

Main Methods:

  • Analysis of protein structures from the Protein-Protein Interaction Affinity Database.
  • Comparison of solvent-accessible surface area (ASA), secondary structure, B factors, and disorder-to-order transitions between unbound and bound states.

Main Results:

  • Interface atoms optimize contacts, leading to increased ASA in 69% of bound proteins.
  • Secondary structure shifts favor helix and strand extension over turns/coils.
  • Reduced flexibility (lower B factors) observed in bound interfaces; disordered residues become ordered.

Conclusions:

  • Protein binding induces significant interface structural and flexibility changes.
  • B-factor analysis of unbound proteins may be unreliable for predicting binding sites.
  • Disordered regions play a role in protein-protein interactions and binding site formation.