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Coupled folding-binding versus docking: a lattice model study.

Nitin Gupta1, Anders Irbäck

  • 1Department of Computer Science and Engineering, Indian Institute of Technology Kanpur, 208016. nitingpt@iitk.ac.in

The Journal of Chemical Physics
|July 23, 2004
PubMed
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We studied protein binding using a simple model. A folded protein sequence showed rigid docking, while an unstructured sequence attached then folded, revealing distinct binding behaviors.

Area of Science:

  • Computational biology
  • Protein folding and binding

Background:

  • Understanding protein sequence determines structure and function is crucial.
  • Protein binding kinetics and thermodynamics influence biological processes.

Purpose of the Study:

  • To investigate the binding behavior differences between two related protein sequences with distinct structural properties.
  • To compare the thermodynamics and kinetics of binding for a folded versus an unstructured protein sequence.

Main Methods:

  • Utilized a simple hydrophobic/polar protein model.
  • Performed Monte Carlo simulations to study binding thermodynamics and kinetics.
  • Analyzed binding modes and free-energy profiles.

Main Results:

Related Experiment Videos

  • Observed significant differences in binding behavior between the two sequences.
  • The folded sequence exhibited rigid docking as its primary binding mode.
  • The unstructured sequence demonstrated a tendency to attach to the target before folding.

    • Conclusions:

    • Protein sequence and its inherent structure significantly impact binding mechanisms.
    • Distinct binding pathways (rigid docking vs. attach-and-fold) arise from differences in protein structural stability.
    • The study provides insights into the interplay between protein structure, folding, and target binding.