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Related Experiment Videos

Dynamic alpha-helices: conformations that do not conform.

Kuljeet Singh Sandhu1, Debasis Dash

  • 1GN Ramachandran Knowledge Center for Genome Informatics, Institute of Genomics and Integrative Biology, CSIR, Delhi 110007, India.

Proteins
|April 5, 2007
PubMed
Summary
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Proteins contain dynamic helical regions that switch conformations, aiding function and stability. These "molecular switches" are crucial for biological processes and protein interactions.

Area of Science:

  • Structural Biology
  • Protein Dynamics
  • Biophysics

Background:

  • Protein structural transitions are vital for function and stability but remain poorly understood.
  • Analysis of Protein Data Bank entries identified numerous regions prone to helical-nonhelical conformational changes.

Purpose of the Study:

  • To characterize dynamic helical regions in proteins.
  • To investigate the factors influencing these conformational transitions.
  • To develop a predictive model for identifying such regions.

Main Methods:

  • Extensive analysis of Protein Data Bank entries.
  • Statistical analysis of residue composition, surface accessibility, and conformational mobility.
  • Contact analysis to understand environmental influences (ligand, nucleic acid, crystal contacts).

Related Experiment Videos

  • Supervised learning (logistic regression) for predictive modeling.

    • Main Results:

    • Identified 103 dynamic helical regions, depleted in hydrophobic residues compared to rigid helices.
    • Dynamic helices exhibit higher surface accessibility and conformational mobility (P=3.35e-07).
    • Conformational transitions are driven by protein-ligand, protein-nucleic acid, and crystal contacts.
    • Predictive model achieved reasonable accuracy in identifying transition-prone regions.
    • Dynamic helices often experience more contacts in helical vs. nonhelical states (P=0.001).

    Conclusions:

    • Dynamic helical regions act as 'molecular switches,' regulating protein recognition and binding.
    • These conformational switches are critical for protein function, stability, and biological processes.
    • Protein structure-function relationships are best understood as dynamic rather than static.