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Related Concept Videos

Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
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Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules

Published on: April 25, 2025

Full protein flexibility is essential for proper hot-spot mapping.

Katrina W Lexa1, Heather A Carlson

  • 1Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1065, United States.

Journal of the American Chemical Society
|December 17, 2010
PubMed
Summary

Accurate hot-spot mapping for structure-based drug design requires accounting for protein flexibility. Simulations reveal that only fully flexible proteins, not rigid ones, correctly identify binding sites by eliminating spurious minima.

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Area of Science:

  • Computational Chemistry
  • Structural Biology
  • Drug Design

Background:

  • Traditional structure-based drug design (SBDD) methods for hot-spot identification often use fixed protein structures.
  • These methods neglect protein flexibility and solvent competition, leading to inaccurate potential surfaces and spurious minima.

Purpose of the Study:

  • To compare the impact of protein rigidity versus flexibility on hot-spot mapping accuracy in SBDD.
  • To investigate the role of solvent effects and probe competition in hot-spot identification.

Main Methods:

  • Mixed-solvent molecular dynamics simulations were performed.
  • Compared simulations using rigid protein structures versus fully flexible protein structures.
  • Analyzed probe molecule interactions and solvent competition on protein surfaces.

Main Results:

  • Restricting protein conformational sampling (rigid or partially flexible) still resulted in numerous spurious local minima.
  • Dynamic averaging of probes and water competition did not smooth the potential surface as expected with restricted flexibility.
  • Only simulations allowing full protein flexibility successfully located correct minima and eliminated spurious ones.

Conclusions:

  • Full protein flexibility is critical for accurate hot-spot mapping in SBDD.
  • Ignoring protein flexibility leads to significant errors in identifying potential drug binding sites.
  • Computational methods for SBDD must incorporate dynamic protein behavior for reliable results.