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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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EGFR in limbo.

Michael J Eck1, William C Hahn

  • 1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA. eck@red.dfci.harvard.edu

Cell
|May 15, 2012
PubMed
Summary
This summary is machine-generated.

Oncogenic mutations in epidermal growth factor receptor (EGFR) promote cancer by stabilizing a disordered kinase state, leading to aberrant activation. This research reveals how EGFR mutations drive cancer through structural instability.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Epidermal growth factor receptor (EGFR) signaling is crucial for normal cellular functions.
  • EGFR activation typically requires ligand binding, leading to receptor dimerization.
  • Aberrant EGFR signaling, driven by mutations, is a hallmark of many cancers.

Discussion:

  • Shan et al. identified a partially disordered conformation of the EGFR kinase domain.
  • This intrinsic structural flexibility is normally transient.
  • Oncogenic mutations appear to lock EGFR in an active, dimerized state.

Key Insights:

  • EGFR kinase possesses inherent structural instability.
  • Mutations exploit this instability, promoting ligand-independent dimerization and activation.
  • This provides a new mechanistic understanding of oncogenic EGFR signaling.

Outlook:

  • Targeting the EGFR kinase's structural dynamics could offer novel therapeutic strategies.
  • Further research into EGFR conformational states may reveal new vulnerabilities.
  • Understanding these mechanisms is key to developing more effective cancer treatments.