An atypical BAR domain protein in autophagy

Autophagy. 2018;14(7):1155-1156. doi: 10.1080/15548627.2018.1445915. Epub 2018 May 25.


The sorting nexin Atg20 interacts with the selective macroautophagy/autophagy scaffolding protein Atg11, suggesting an important role for Atg20 in the initiation of selective autophagy. To explore this possibility, we recently investigated the structure and function of Atg20 using a variety of biophysical and yeast genetic approaches. Our data demonstrate that the BAR domain of Atg20 interacts with Snx4/Atg24 to form an asymmetric heterodimeric BAR domain complex. Atg20 also contains a long intrinsically disordered N terminus that facilitates binding to Atg11 and a large 89-amino acid insertion in its BAR domain, which we have termed the BAR-GAP. This BAR-GAP region is a unique feature of Atg20 and has not been observed in other BAR domains. Furthermore, the BAR-GAP of Atg20 contains an amphipathic helix which is required for membrane binding, tubulation and autophagy. Our findings demonstrate the important role of this novel region in autophagy.

Keywords: SAXS; amphipathic helix; electron microscopy; structure; vacuole; yeast.

Publication types

  • Research Support, N.I.H., Extramural
  • Comment

MeSH terms

  • Autophagy*
  • Autophagy-Related Proteins
  • Saccharomyces cerevisiae
  • Saccharomyces cerevisiae Proteins*
  • Sorting Nexins
  • Vesicular Transport Proteins


  • Atg11 protein, S cerevisiae
  • Autophagy-Related Proteins
  • Saccharomyces cerevisiae Proteins
  • Sorting Nexins
  • Vesicular Transport Proteins