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Related Experiment Videos

Correlation between dynamics and high affinity binding in an SH2 domain interaction

L E Kay1, D R Muhandiram, N A Farrow

  • 1Protein Engineering Network Centres of Excellence, University of Toronto, Ontario, Canada.

Biochemistry
|January 16, 1996
PubMed
Summary
This summary is machine-generated.

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Protein-protein interactions are key for binding affinity. This study reveals that the dynamic behavior of certain regions in the phospholipase C-gamma 1 SH2 domain correlates with high-affinity binding and specificity.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Dynamics

Background:

  • Protein-protein interfaces involve numerous residues, with varying roles in binding affinity and specificity.
  • Src-homology-2 (SH2) domains recognize phosphotyrosine (pTyr) residues, with specificity enhanced by C-terminal interactions.
  • The phospholipase C-gamma 1 SH2 (PLCC SH2) domain binds tightly to peptides with as few as three residues C-terminal to pTyr.

Purpose of the Study:

  • To investigate the role of molecular dynamics in protein-protein interactions within the PLCC SH2 domain.
  • To correlate the mobility of specific residues with binding affinity and specificity.
  • To understand how dynamic behavior influences the recognition of phosphopeptides by SH2 domains.

Main Methods:

  • Utilized novel deuterium (2H) based nuclear magnetic resonance (NMR) spin relaxation experiments.

Related Experiment Videos

  • Probed nanosecond-picosecond timescale dynamics of methyl-containing side chain residues.
  • Analyzed the PLCC SH2 domain in both free and peptide-complexed states.

    • Main Results:

    • Identified high mobility in PLCC SH2 domain regions contacting residues C-terminal to pTyr, in both free and complexed states.
    • Observed significant restriction of motion within the pTyr binding site upon peptide complexation.
    • Demonstrated a correlation between the dynamic behavior of specific residues and binding affinity/specificity.

    Conclusions:

    • The dynamic behavior of the PLCC SH2 domain is crucial for high-affinity binding and specificity.
    • Regions outside the primary pTyr binding site exhibit mobility that contributes to binding.
    • NMR spin relaxation experiments provide insights into the relationship between protein dynamics and function.