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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Clathrin-mediated endocytosis (CME) is crucial for cellular processes.
  • Eps15 protein interactions are central to CME.
  • Eps15 EH domains bind Asn-Pro-Phe (NPF) motifs in intrinsically disordered regions (IDRs).

Purpose of the Study:

  • Investigate the interaction between Eps15 EH domains and a disordered Dab2 fragment.
  • Elucidate the molecular mechanisms governing protein interactions in early CME.
  • Understand the role of binding promiscuity in Eps15-mediated endocytosis.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy.
  • Biochemical assays to study protein-protein interactions.
  • Analysis of intrinsically disordered regions (IDRs) and their binding partners.

Main Results:

  • Eps15 EH domains exhibit binding promiscuity, recognizing NPF and other phenylalanine-containing motifs.
  • Eps15's own IDR (Eps15_IDR) interacts with EH domains, suggesting a self-inhibitory mechanism.
  • Eps15_IDR and Dab2 fragment bind simultaneously to EH123, forming dynamic networks and promoting condensate formation.

Conclusions:

  • Binding promiscuity of Eps15 EH domains is key to its function in CME.
  • Competitive and cooperative interactions regulate Dab2 recruitment and condensate assembly.
  • These findings offer molecular insights into the dynamic regulation of endocytic protein networks.