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Insights into ErbB signaling from the structure of the ErbB2-pertuzumab complex

Matthew C Franklin1, Kendall D Carey, Felix F Vajdos

  • 1Department of Protein Engineering, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94114 USA.

Cancer Cell
|April 20, 2004
PubMed

Insights

We determined the structure of human epidermal growth factor receptor 2 (ErbB2) bound to pertuzumab. This antibody blocks ErbB2 dimerization and signaling, offering insights into cancer therapy.

Area of Science:

  • Structural Biology
  • Molecular Biology
  • Immunology

Background:

  • Human epidermal growth factor receptor 2 (ErbB2/HER2) is a key target in cancer therapy.
  • Pertuzumab is a monoclonal antibody that targets ErbB2.

Purpose of the Study:

  • To determine the crystal structure of ErbB2 in complex with pertuzumab.
  • To elucidate the molecular interactions between ErbB2 and pertuzumab.
  • To investigate the role of specific residues in ErbB2-pertuzumab binding and ErbB2-ErbB3 heterodimerization.

Main Methods:

  • X-ray crystallography (3.2 Å resolution)
  • Mutagenesis studies
  • Analysis of protein-protein interactions

Main Results:

  • The structure reveals pertuzumab binds ErbB2's domain II, sterically hindering receptor dimerization.
  • Key pertuzumab residues essential for ErbB2 interaction were identified.
  • Mutagenesis confirmed the functional significance of ErbB2 residues at the interface.
  • ErbB2-ErbB3 heterodimerization was analyzed, with some conserved homodimerization residues found dispensable.

Conclusions:

  • The ErbB2-pertuzumab structure provides a molecular basis for pertuzumab's mechanism of action.
  • Understanding these interactions can inform the development of targeted cancer therapies.
  • The study clarifies the distinct requirements for ErbB2 homodimerization versus ErbB2-ErbB3 heterodimerization.

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