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Related Experiment Videos

Protein-protein recognition: an experimental and computational study of the R89K mutation in Raf and its effect on

J Zeng1, M Fridman, H Maruta

  • 1Laboratoire de Biologie Structurale (C.N.R.S), I.G.B.M.C, Illkirch (C.U. de Strasbourg), France.

Protein Science : a Publication of the Protein Society
|April 21, 1999
PubMed
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The Raf-R89K mutation significantly reduces Ras-Raf binding affinity, disrupting the MAP kinase pathway. Computational simulations reveal desolvation and electrostatic interactions as key factors influencing binding energy changes.

Area of Science:

  • Molecular biology
  • Biophysics
  • Computational chemistry

Background:

  • The Ras-Raf interaction is crucial for the MAP kinase signaling pathway, regulating cell growth and differentiation.
  • Residue 89 in Raf (Raf/Arg89) is central to the Ras-Raf binding interface and influences binding affinity.
  • The Raf-R89K mutation abolishes in vivo signaling, indicating a critical role for Arg89.

Purpose of the Study:

  • To experimentally and computationally investigate the impact of the Raf-R89K mutation on Ras-Raf binding.
  • To determine the binding free energy change associated with the mutation.
  • To elucidate the microscopic interactions responsible for the altered binding affinity.

Main Methods:

  • Experimental measurement of Ras-Raf binding affinity using a fusion protein and radiolabeled GTP-Ras.

Related Experiment Videos

  • Computational alchemical free energy simulations to model the Arg to Lys mutation at residue 89.
  • Analysis of electrostatic interactions and solvation free energy contributions using multiple force fields.

    • Main Results:

    • The Raf-R89K mutation reduced Ras-Raf binding affinity by at least 175-fold (ΔΔG ≥ 3.0 kcal/mol).
    • Alchemical simulations yielded a binding free energy decrease of 2.9 ± 1.9 kcal/mol, consistent with experimental data.
    • Increased desolvation cost for Lys compared to Arg (7 kcal/mol) and electrostatic interactions with Ras residues (Ser39) and other Raf residues contributed significantly to the binding energy change.

    Conclusions:

    • The Raf-R89K mutation severely impairs Ras-Raf binding due to unfavorable desolvation and altered electrostatic interactions.
    • The findings highlight the general principle of Lys's lower propensity to participate in protein-protein interfaces compared to Arg.
    • This study provides atomic-level insights into Ras-Raf interactions, valuable for understanding mutation effects in signaling pathways.