PI4P-Dependent Targeting of ATG14 to Mature Autophagosomes

Hui Qiao Sun, Yan Chen, Per Niklas Hedde, Joachim Mueller, Joseph P. Albanesi, Helen Yin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Degradation of autophagosomal cargo requires the tethering and fusion of autophagosomes with lysosomes that is mediated by the scaffolding protein autophagy related 14 (ATG14). Here, we report that phosphatidylinositol 4-kinase 2A (PI4K2A) generates a pool of phosphatidylinositol 4-phosphate (PI4P) that facilitates the recruitment of ATG14 to mature autophagosomes. We also show that PI4K2A binds to ATG14, suggesting that PI4P may be synthesized in situ in the vicinity of ATG14. Impaired targeting of ATG14 to autophagosomes in PI4K2A-depleted cells is rescued by the introduction of PI4P but not its downstream product phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2). Thus, PI4P and PI(4,5)P2 have independent functions in late-stage autophagy. These results provide a mechanism to explain prior studies indicating that PI4K2A and its product PI4P are necessary for autophagosome-lysosome fusion.

Original languageEnglish (US)
Pages (from-to)722-729
Number of pages8
JournalBiochemistry
Volume61
Issue number8
DOIs
StatePublished - Apr 19 2022

Bibliographical note

Funding Information:
The authors thank Dr. Michael Fine for helpful discussions on colocalization analyses using LSM510 software. This work was supported by NIH grants GM121536 (H.Y, J.P.A., J.D.M.) and GM064589 (J.D.M. and Y.C.).

Publisher Copyright:
© 2022 American Chemical Society.

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural

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