Phagolysosome resolution requires contacts with the endoplasmic reticulum and phosphatidylinositol-4-phosphate signalling

Roni Levin-Konigsberg, Fernando Montaño-Rendón, Tal Keren-Kaplan, Ren Li, Braeden Ego, Sivakami Mylvaganam, Jessica E. DiCiccio, William S. Trimble, Michael C. Bassik, Juan S. Bonifacino, Gregory D. Fairn, Sergio Grinstein

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

Phosphoinositides have a pivotal role in the maturation of nascent phagosomes into microbicidal phagolysosomes. Following degradation of their contents, mature phagolysosomes undergo resolution, a process that remains largely uninvestigated. Here we studied the role of phosphoinositides in phagolysosome resolution. Phosphatidylinositol-4-phosphate (PtdIns(4)P), which is abundant in maturing phagolysosomes, was depleted as they tubulated and resorbed. Depletion was caused, in part, by transfer of phagolysosomal PtdIns(4)P to the endoplasmic reticulum, a process mediated by oxysterol-binding protein-related protein 1L (ORP1L), a RAB7 effector. ORP1L formed discrete tethers between the phagolysosome and the endoplasmic reticulum, resulting in distinct regions with alternating PtdIns(4)P depletion and enrichment. Tubules emerged from PtdIns(4)P-rich regions, where ADP-ribosylation factor-like protein 8B (ARL8B) and SifA- and kinesin-interacting protein/pleckstrin homology domain-containing family M member 2 (SKIP/PLEKHM2) accumulated. SKIP binds preferentially to monophosphorylated phosphoinositides, of which PtdIns(4)P is most abundant in phagolysosomes, contributing to their tubulation. Accordingly, premature hydrolysis of PtdIns(4)P impaired SKIP recruitment and phagosome resolution. Thus, resolution involves phosphoinositides and tethering of phagolysosomes to the endoplasmic reticulum.

Original languageEnglish
Pages (from-to)1234-1247
Number of pages14
JournalNature Cell Biology
Volume21
Issue number10
DOIs
Publication statusPublished - Oct 1 2019
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the following grants and scholarships: Connaught International Scholarship for Doctoral Students from the University of Toronto and the National Council for Science and Technology/Consejo Nacional de Ciencia y Tecnología (CONACYT) of Mexico (to R.L.-K.) and FDN-143202 from the Canadian Institutes of Health Research (to S.G.). We thank J. Heddleston, S. Khuon and T. Leong-Chew from the AIC for training and support for LLSM. The AIC is a jointly-funded venture of the Gordon and Betty Moore Foundation and the Howard Hughes Medical Institute.

Publisher Copyright:
© 2019, The Author(s), under exclusive licence to Springer Nature Limited.

ASJC Scopus Subject Areas

  • Cell Biology

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