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Retromer Sets a Trap for Endosomal Cargo Sorting.

Ludger Johannes1, Christian Wunder1

  • 1Institut Curie, PSL Research University, Chemical Biology of Membranes and Therapeutic Delivery unit, INSERM U 1143, CNRS UMR 3666, 26 rue d'Ulm, 75248 Paris Cedex 05, France.

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Summary
This summary is machine-generated.

The retromer complex drives membrane trafficking from endosomes. Lucas et al. reveal how retromer subunits cooperate to recruit endosomal membranes and recognize cargo.

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Membrane trafficking is essential for cellular function, involving the movement of molecules within cells.
  • The retromer complex is a key mediator of endosome-to-trans-Golgi network and endosome-to-plasma membrane transport.
  • Dysfunctional retromer is linked to neurodegenerative diseases, highlighting its importance.

Purpose of the Study:

  • To elucidate the structural mechanism of retromer-mediated membrane trafficking.
  • To understand how the retromer complex recognizes and binds to endosomal cargo.
  • To investigate the integration of membrane recruitment and cargo recognition by retromer.

Main Methods:

  • Structural analysis of the cargo-bound retromer complex using cryo-electron microscopy.
  • Biochemical assays to study protein-protein interactions between retromer subunits and cargo.
  • In vitro reconstitution of retromer complex assembly and function.

Main Results:

  • Detailed structural insights into the retromer complex bound to its cargo.
  • Identification of cooperative interactions between retromer subunits that mediate membrane binding.
  • Characterization of the mechanism by which cargo recognition is coupled to membrane recruitment.
  • The study reveals how retromer subunits work together to initiate vesicle formation.

Conclusions:

  • The retromer complex employs a cooperative mechanism for endosomal membrane recruitment and cargo selection.
  • Structural data provides a mechanistic understanding of retromer function in membrane trafficking.
  • This work offers insights into potential therapeutic targets for retromer-related disorders.