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Oncogenic mutations reduce the stability of SRC kinase

S Fabio Falsone1, Sebastian Leptihn, Anja Osterauer

  • 1Institut für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.

Journal of Molecular Biology
|October 27, 2004
PubMed

Insights

The viral tyrosine kinase v-Src is less stable and more prone to aggregation than its cellular counterpart c-Src. This destabilization, caused by oncogenic mutations, leads to v-Src inactivity at physiological temperatures.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Oncology

Background:

  • The viral tyrosine kinase v-Src possesses oncogenic potential due to its constitutive activity.
  • Unlike cellular c-Src, v-Src has a C-terminal deletion and point mutations rendering it uncontrollable.

Purpose of the Study:

  • To investigate the structural and stability differences between v-Src and c-Src.
  • To elucidate the molecular basis for the distinct regulatory mechanisms of viral versus cellular Src kinases.

Main Methods:

  • In vitro analysis of the structure and stability of purified v-Src and c-Src proteins.
  • Assessment of protein unfolding and aggregation propensity.
  • Evaluation of hydrophobic residue exposure in the native state.

Main Results:

  • v-Src exhibits significantly lower stability against unfolding and aggregation compared to c-Src.
  • Hydrophobic residues are more exposed in the native state of v-Src.
  • v-Src demonstrates inactivity near physiological temperatures.

Conclusions:

  • The mutations conferring oncogenic properties to v-Src lead to its destabilization.
  • Destabilization and increased hydrophobic exposure contribute to v-Src's altered activity profile.
  • Understanding these structural differences is crucial for comprehending viral oncogenesis.

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