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Related Concept Videos

Introduction to Membrane Traffic01:44

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The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Receptor-mediated Endocytosis01:20

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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
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Author Spotlight: Image-Based Methods to Study Membrane Trafficking Events in Stomatal Lineage Cells
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Membrane trafficking: licensing a cargo receptor for ER export.

J Christopher Fromme1

  • 1Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA.

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Summary

Endoplasmic reticulum quality control prevents misfolded protein packaging. Mature cargo engagement with receptors recruits vesicle cargo adaptors, a key step in protein sorting.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Trafficking

Background:

  • The endoplasmic reticulum (ER) maintains protein homeostasis through quality control.
  • Misfolded and immature proteins are retained in the ER, preventing their transport.
  • Mechanisms for cargo selection during ER-to-Golgi transport are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms of cargo selection during ER export.
  • To identify factors involved in the recruitment of cargo adaptors to the ER membrane.

Main Methods:

  • Investigated protein-protein interactions using co-immunoprecipitation.
  • Utilized live-cell imaging to observe cargo and receptor dynamics.
  • Employed biochemical assays to confirm adaptor recruitment.

Main Results:

  • Demonstrated that mature cargo binding to its receptor is essential for adaptor recruitment.
  • Identified a specific vesicle cargo adaptor involved in this process.
  • Showed that cargo-receptor engagement directly triggers adaptor recruitment.

Conclusions:

  • Cargo-receptor engagement is a critical signal for recruiting vesicle cargo adaptors.
  • This mechanism ensures that only correctly folded proteins are packaged for transport.
  • Provides new insights into the quality control pathways of the endoplasmic reticulum.