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Structure of the endosomal CORVET tethering complex.

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The CORVET complex, crucial for cell function, uses Rab5, PI3P, and membrane defects to tether membranes. This reveals an organelle-specific code for membrane fusion, distinct from the related HOPS complex.

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Area of Science:

  • Cell biology
  • Molecular and structural biology

Background:

  • The endolysosomal system is vital for cellular processes like nutrient uptake and protein regulation.
  • Endosomal maturation involves membrane fusion, mediated by tethering complexes such as CORVET and HOPS.
  • The specific membrane recognition mechanisms of these tethering complexes are not well understood.

Purpose of the Study:

  • To elucidate the structure and membrane tethering requirements of the CORVET complex.
  • To understand how CORVET distinguishes its target membranes compared to the homologous HOPS complex.

Main Methods:

  • Cryo-electron microscopy was used to determine the structure of the CORVET complex.
  • Biochemical assays were employed to investigate the minimal requirements for CORVET-mediated membrane tethering.

Main Results:

  • The structure of CORVET was solved, revealing its core similarity to HOPS but distinct functional subunits.
  • CORVET requires Rab5 GTPase, phosphatidylinositol-3-phosphate (PI3P), and membrane lipid packing defects for tethering.
  • These findings suggest an organelle-specific membrane code for fusion.

Conclusions:

  • CORVET and HOPS share structural similarities but differ in membrane recognition.
  • CORVET utilizes a unique combination of factors, including PI3P and membrane properties, for specific membrane tethering.
  • The study provides a paradigm for how tethering complexes function through conserved shape and membrane interactions.