ER remodeling by the large GTPase atlastin promotes vacuolar growth of Legionella pneumophila.
EMBO Rep
; 18(10): 1817-1836, 2017 10.
Article
in En
| MEDLINE
| ID: mdl-28835546
ABSTRACT
The pathogenic bacterium Legionella pneumophila replicates in host cells within a distinct ER-associated compartment termed the Legionella-containing vacuole (LCV). How the dynamic ER network contributes to pathogen proliferation within the nascent LCV remains elusive. A proteomic analysis of purified LCVs identified the ER tubule-resident large GTPase atlastin3 (Atl3, yeast Sey1p) and the reticulon protein Rtn4 as conserved LCV host components. Here, we report that Sey1/Atl3 and Rtn4 localize to early LCVs and are critical for pathogen vacuole formation. Sey1 overproduction promotes intracellular growth of L. pneumophila, whereas a catalytically inactive, dominant-negative GTPase mutant protein, or Atl3 depletion, restricts pathogen replication and impairs LCV maturation. Sey1 is not required for initial recruitment of ER to PtdIns(4)P-positive LCVs but for subsequent pathogen vacuole expansion. GTP (but not GDP) catalyzes the Sey1-dependent aggregation of purified, ER-positive LCVs in vitro Thus, Sey1/Atl3-dependent ER remodeling contributes to LCV maturation and intracellular replication of L. pneumophila.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Vacuoles
/
Legionella pneumophila
/
GTP-Binding Proteins
/
Endoplasmic Reticulum
/
Membrane Proteins
Limits:
Humans
Language:
En
Journal:
EMBO Rep
Year:
2017
Document type:
Article