RILP regulates vacuolar ATPase through interaction with the V1G1 subunit

Maria De Luca, Laura Cogli, Cinzia Progida, Veronica Nisi, Roberta Pascolutti, Sara Sigismund, Pier Paolo Di Fiore, Cecilia Bucci

Research output: Contribution to journalArticlepeer-review

Abstract

Rab-interacting lysosomal protein (RILP) is a downstream effector of the Rab7 GTPase. GTP-bound Rab7 recruits RILP to endosomal membranes and, together, they control late endocytic traffic, phagosome and autophagosome maturation and are responsible for signaling receptor degradation. We have identified, using different approaches, the V1G1 (officially known as ATP6V1G1) subunit of the vacuolar ATPase (V-ATPase) as a RILP-interacting protein. V1G1 is a component of the peripheral stalk and is fundamental for correct V-ATPase assembly. We show here that RILP regulates the recruitment of V1G1 to late endosomal and lysosomal membranes but also controls V1G1 stability. Indeed, we demonstrate that V1G1 can be ubiquitylated and that RILP is responsible for proteasomal degradation of V1G1. Furthermore, we demonstrate that alterations in V1G1 expression levels impair VATPase activity. Thus, our data demonstrate for the first time that RILP regulates the activity of the V-ATPase through its interaction with V1G1. Given the importance of V-ATPase in several cellular processes and human diseases, these data suggest that modulation of RILP activity could be used to control V-ATPase function.

Original languageEnglish
Pages (from-to)2697-2708
Number of pages12
JournalJournal of Cell Science
Volume127
Issue number12
DOIs
Publication statusPublished - 2014

Keywords

  • Rab7
  • RILP
  • Ubiquitin
  • V1G1
  • Vacuolar ATPase

ASJC Scopus subject areas

  • Cell Biology
  • Medicine(all)

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