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Oncogenic mutations and packing defects in protein structure

Ariel Fernández1

  • 1Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, USA. ariel@uchicago.edu

Journal of Biomolecular Structure & Dynamics
|July 12, 2003
PubMed

Insights

Oncogenic mutations in proteins like p21ras and p53 disrupt structural integrity, impairing function. These mutations reduce protein binding affinity by altering how hydrogen bonds interact with water, impacting tumor formation.

Area of Science:

  • Structural biology
  • Oncogenesis
  • Protein biochemistry

Background:

  • Understanding oncogenic mutations is crucial for cancer research.
  • The structural basis for altered protein function in cancer remains unclear.
  • Specific examples like p21ras and p53 are key in cancer studies.

Purpose of the Study:

  • To investigate the structural consequences of oncogenic mutations on protein function.
  • To elucidate how mutations in p21ras and p53 affect protein interactions and binding affinity.
  • To assess the role of structural defects in proto-oncogene activation.

Main Methods:

  • Analysis of protein structure and hydrogen bond shielding in wild-type and mutant proteins.
  • Investigating the role of intermolecular and intramolecular interactions in protein complexation and ligand binding.
  • Assessing the impact of mutations on protein-ligand binding affinity and hydrolysis.

Main Results:

  • Oncogenic mutations cause structural deficiencies in protein packing, specifically affecting backbone hydrogen bonds.
  • Mutations in p21ras and p53 impair protein interactivity by suppressing normal binding signals and reducing binding affinity.
  • Mutations hinder GAP-induced hydrolysis in p21ras and decrease DNA binding affinity in p53.

Conclusions:

  • Oncogenic mutations alter protein structure, leading to impaired function and reduced binding affinity.
  • The study reveals mechanisms by which mutations in p21ras and p53 contribute to oncogenesis.
  • High sensitivity of structural defects to genetic mutations may be a prerequisite for proto-oncogene existence.

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