RUSC2 and WDR47 oppositely regulate kinesin-1-dependent distribution of ATG9A to the cell periphery

Mol Biol Cell. 2021 Nov 1;32(21):ar25. doi: 10.1091/mbc.E21-06-0295. Epub 2021 Aug 25.

Abstract

Autophagy-related protein 9 (ATG9) is a transmembrane protein component of the autophagy machinery that cycles between the trans-Golgi network (TGN) in the perinuclear area and other compartments in the peripheral area of the cell. In mammalian cells, export of the ATG9A isoform from the TGN into ATG9A-containing vesicles is mediated by the adaptor protein 4 (AP-4) complex. However, the mechanisms responsible for the subsequent distribution of these vesicles to the cell periphery are unclear. Herein we show that the AP-4-accessory protein RUSC2 couples ATG9A-containing vesicles to the plus-end-directed microtubule motor kinesin-1 via an interaction between a disordered region of RUSC2 and the kinesin-1 light chain. This interaction is counteracted by the microtubule-associated protein WDR47. These findings uncover a mechanism for the peripheral distribution of ATG9A-containing vesicles involving the function of RUSC2 as a kinesin-1 adaptor and WDR47 as a negative regulator of this function.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Autophagosomes / metabolism
  • Autophagy
  • Autophagy-Related Proteins / metabolism*
  • Carrier Proteins / metabolism*
  • Carrier Proteins / physiology
  • HEK293 Cells
  • HeLa Cells
  • Humans
  • Kinesins / metabolism
  • Membrane Proteins / metabolism*
  • Microtubule-Associated Proteins / metabolism*
  • Microtubules / metabolism
  • Nerve Tissue Proteins / metabolism*
  • Protein Transport / physiology
  • Vesicular Transport Proteins / metabolism*
  • trans-Golgi Network / metabolism

Substances

  • ATG9A protein, human
  • Autophagy-Related Proteins
  • Carrier Proteins
  • KIF5B protein, human
  • Membrane Proteins
  • Microtubule-Associated Proteins
  • Nerve Tissue Proteins
  • RUSC2 protein, human
  • Vesicular Transport Proteins
  • WDR47 protein, human
  • Kinesins