PI4P and BLOC-1 remodel endosomal membranes into tubules - Compartimentation et dynamique cellulaires Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2021

PI4P and BLOC-1 remodel endosomal membranes into tubules

Riddhi Atul Jani
Ilse Hurbain
Mathilde Dimarco
Yueyao Zhu
Maria João Amorim
  • Fonction : Auteur
Michael Marks
Graça Raposo

Résumé

ABSTRACT Intracellular trafficking is mediated by transport carriers that originate by membrane remodeling from donor organelles. Tubular carriers play major roles in the flux of membrane lipids and proteins to acceptor organelles. However, how lipids and proteins impose a tubular geometry on the carriers is incompletely understood. By exploiting imaging approaches at different scales on cells and in vitro membrane systems, we show that phosphatidylinositol-4-phosphate (PI4P) and biogenesis of lysosome-related organelles complex 1 (BLOC-1) govern the formation, stability and functions of recycling endosomal tubules. Endosomal PI4P production by type II PI4-kinases is needed to form nascent curved tubules through binding of BLOC-1 that stabilize and elongate them. Membrane remodeling by the PI4P/ BLOC-1 module functions not only in the recycling of endosomal cargoes, but also in the lifecycles of intracellular pathogens such as Chlamydia bacteria and influenza virus. This study demonstrates how a phospholipid and a protein complex coordinate as a minimal machinery to remodel cellular membranes into functional tubes.
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Dates et versions

hal-03869457 , version 1 (27-11-2021)
hal-03869457 , version 2 (24-11-2022)

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Riddhi Atul Jani, Aurélie Di Cicco, Tal Keren-Kaplan, Silvia Vale-Costa, Daniel Hamaoui, et al.. PI4P and BLOC-1 remodel endosomal membranes into tubules. 2021. ⟨hal-03869457v1⟩
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