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EMAC, Retromer, and VSRs: do they connect?

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Plant scientists must reconsider models of intracellular membrane trafficking. New findings suggest the plant retromer complex may differ from yeast and mammalian counterparts, impacting our understanding of vacuolar sorting receptors (VSRs) transport.

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Area of Science:

  • Plant cell biology
  • Molecular and cell biology
  • Membrane trafficking

Background:

  • Eukaryotic endomembrane trafficking shares commonalities, enabling hypothesis generation in plants based on yeast and mammalian models.
  • Novel plant cellular compartments with unique protein complex localizations necessitate cautious interpretation of trafficking mechanisms.
  • The recently identified ER and microtubule-associated compartment (EMAC) presents such a case.

Purpose of the Study:

  • To critically evaluate the proposed retrograde transport of vacuolar sorting receptors (VSRs) to the EMAC via retromer vesicles.
  • To highlight discrepancies between proposed models and existing literature on plant retromer composition, localization, and function.
  • To address recent contradictory findings regarding VSR trafficking in plants.

Main Methods:

  • Literature review and critical analysis of existing data on plant retromer and VSR trafficking.
  • Comparison of plant retromer models with those from yeast and mammalian systems.
  • Re-evaluation of the EMAC's role in intracellular trafficking pathways.

Main Results:

  • The postulation of EMAC as a recipient of VSRs via retromer vesicles is based on non-plant models and overlooks specific plant literature.
  • Plant retromer's composition and function may deviate from the conserved pentameric complex (retromer core and sorting nexins) model.
  • Recent studies present findings that contradict the proposed VSR trafficking pathway to EMAC.

Conclusions:

  • Current models of VSR trafficking to EMAC in plants require revision based on plant-specific retromer characteristics.
  • Plant retromer may not function identically to its counterparts in yeast and mammals, necessitating a re-examination of its role in VSR sorting.
  • Further research is needed to elucidate the precise mechanisms of VSR trafficking and the function of EMAC in plant cells.