1. Cell Biology
Download icon

Autophagy: COPII vesicles and the expansion of the phagophore

  1. Catherine Rabouille  Is a corresponding author
  1. Royal Netherlands Academy of Arts and Sciences and University Medical Center, The Netherlands
  2. University Medical Center Groningen, The Netherlands
Insight
Cite this article as: eLife 2019;8:e44944 doi: 10.7554/eLife.44944
1 figure

Figures

Autophagy starts with the production of special COPII vesicles.

When cells are growing (top), the E3 ligase FBXW5, which is associated with Cul1 and SKP1, tags Sec23B (pink circle) with ubiquitin (Ub). This labels Sec23B for destruction by the cell. Starvation kick-starts autophagy, whereby the cell recycles certain components in order to obtain amino acids and nutrients. It also activates ULK1, a kinase that phosphorylates Sec23B (red circle) on Serine 186, thus preventing FBXW5 from tagging it for destruction. Instead, Sec23B-P associates with Sec24AB (green) to form a complex that is not recruited to the endoplasmic reticulum exit sites (ERES; gray line), but to the ER-Golgi intermediate compartment (ERGIC; black line). Another COPII protein, Sec12 (light blue), has also been relocated to this structure. This creates special COPII vesicles (dark blue) that bud to fuel the growth of the phagophore (violet structure) and autophagic activity.

Download links

A two-part list of links to download the article, or parts of the article, in various formats.

Downloads (link to download the article as PDF)

Download citations (links to download the citations from this article in formats compatible with various reference manager tools)

Open citations (links to open the citations from this article in various online reference manager services)