Sorting of yeast membrane proteins into an endosome-to-Golgi pathway involves direct interaction of their cytosolic domains with Vps35p

J Cell Biol. 2000 Oct 16;151(2):297-310. doi: 10.1083/jcb.151.2.297.

Abstract

Resident late-Golgi membrane proteins in Saccharomyces cerevisiae are selectively retrieved from a prevacuolar-endosomal compartment, a process dependent on aromatic amino acid-based sorting determinants on their cytosolic domains. The formation of retrograde vesicles from the prevacuolar compartment and the selective recruitment of vesicular cargo are thought to be mediated by a peripheral membrane retromer protein complex. We previously described mutations in one of the retromer subunit proteins, Vps35p, which caused cargo-specific defects in retrieval. By genetic and biochemical means we now show that Vps35p directly associates with the cytosolic domains of cargo proteins. Chemical cross-linking, followed by coimmunoprecipitation, demonstrated that Vps35p interacts with the cytosolic domain of A-ALP, a model late-Golgi membrane protein, in a retrieval signal-dependent manner. Furthermore, mutations in the cytosolic domains of A-ALP and another cargo protein, Vps10p, were identified that suppressed cargo-specific mutations in Vps35p but did not suppress the retrieval defects of a vps35 null mutation. Suppression was shown to be due to an improvement in protein sorting at the prevacuolar compartment. These data strongly support a model in which Vps35p acts as a "receptor" protein for recognition of the retrieval signal domains of cargo proteins during their recruitment into retrograde vesicles.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Alkaline Phosphatase / genetics
  • Alkaline Phosphatase / metabolism
  • Carrier Proteins*
  • Cell Polarity
  • Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / genetics
  • Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / metabolism
  • Endosomes / metabolism*
  • Fungal Proteins / genetics
  • Fungal Proteins / metabolism*
  • Golgi Apparatus / metabolism*
  • Membrane Proteins / metabolism*
  • Models, Biological
  • Mutation
  • Protein Sorting Signals
  • Protein Structure, Tertiary
  • Protein Transport*
  • Receptors, Cell Surface / genetics
  • Recombinant Fusion Proteins / metabolism
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins*
  • Signal Recognition Particle / metabolism
  • Suppression, Genetic
  • Vesicular Transport Proteins*

Substances

  • Carrier Proteins
  • Fungal Proteins
  • Membrane Proteins
  • PEP1 protein, S cerevisiae
  • Protein Sorting Signals
  • Receptors, Cell Surface
  • Recombinant Fusion Proteins
  • Saccharomyces cerevisiae Proteins
  • Signal Recognition Particle
  • VPS35 protein, S cerevisiae
  • Vesicular Transport Proteins
  • Alkaline Phosphatase
  • Dipeptidyl-Peptidases and Tripeptidyl-Peptidases
  • STE13 protein, S cerevisiae