Cited by 126Legionella and Acanthamoeba researchCellular transport and secretionAutophagy in Disease and Therapy

Functional analysis of novel Rab GTPases identified in the proteome of purified Legionella-containing vacuoles from macrophages: Macrophage LCV proteome

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Hoffmann, Christine, Finsel, Ivo, Otto, Andreas, Pfaffinger, Gudrun, Rothmeier, Eva, Hecker, Michael, Becher, Dörte, Hilbi, Hubert·2014·Cellular Microbiology

Abstract

The opportunistic pathogen Legionella pneumophila employs the Icm/Dot type IV secretion system and ∼300 different effector proteins to replicate in macrophages and amoebae in a distinct 'Legionella-containing vacuole' (LCV). LCVs from infected RAW 264.7 macrophages were enriched by immuno-affinity separation and density gradient centrifugation, using an antibody against the L. pneumophila effector SidC, which specifically binds to the phosphoinositide PtdIns(4)P on the pathogen vacuole membrane. The proteome of purified LCVs was determined by mass spectro-metry (data are available via ProteomeXchange with identifier PXD000647). The proteomics analysis revealed more than 1150 host proteins, including 13 small GTPases of the Rab family. Using fluorescence microscopy, 6 novel Rab proteins were confirmed to localize on pathogen vacuoles harbouring wild-type but not ΔicmT mutant L. pneumophila. Individual depletion of 20 GTPases by RNA interference indicated that endocytic GTPases (Rab5a, Rab14 and Rab21) restrict intracellular growth of L. pneumophila, whereas secretory GTPases (Rab8a, Rab10 and Rab32) implicated in Golgi-endosome trafficking promote bacterial replication. Upon silencing of Rab21 or Rab32, fewer LCVs stained positive for Rab4 or Rab9, implicated in secretory or retrograde trafficking respectively. Moreover, depletion of Rab8a, Rab14 or Rab21 significantly decreased the number of SidC-positive LCVs, suggesting that PtdIns(4)P is reduced under these conditions. L. pneumophila proteins identified in purified LCVs included proteins putatively implicated in phosphorus metabolism and as many as 60 Icm/Dot-translocated effectors, which are likely required early during infection. Taken together, the phagocyte and Legionella proteomes of purified LCVs lay the foundation for further hypothesis-driven investigations of the complex process of pathogen vacuole formation.

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  • Rab 3, 4, 5, 7, 9, 10, 11, and 14 are associated with pathogen-containing phagosomes and allocated to individual maturation stages.

    “A number of Rab proteins have been associated with pathogen-containing phagosomes including Rab 3, 4, 5, 7, 9, 10, 11, and 14 (14, 15) and allocated to individual maturation stages.”

    From Macrophage defense mechanisms against intracellular bacteria (2015) · cites this paper as [15]

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Authors
Hoffmann, C., Finsel, I., Otto, A., Pfaffinger, G., Rothmeier, E., Hecker, M., Becher, D., & Hilbi, H.
Affiliations
  • Max-von-Pettenkofer-Institut für Hygiene und Medizinische Mikrobiologie (DE)
  • Universität Greifswald (DE)
Corresponding author
Hilbi, Hubert
Venue
Cellular Microbiology
Published
2014-01-27
Volume
16
Issue
7
Pages
n/a-n/a
ISSN
1462-5814 (ISSN-L)
OpenAlex
W1542673149
Cited by
126
References
66
Citations by year
2026: 6 · 2025: 1 · 2024: 5 · 2023: 6 · 2022: 5 · 2021: 8 · 2020: 6 · 2019: 9 · 2018: 17 · 2017: 16 · 2016: 14 · 2015: 21 · 2014: 12
FWCI
11.13
Type
journal article
Language
en
Open access
Locations
  • Cellular Microbiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation
  • Imperial College London
  • Deutsche Forschungsgemeinschaft (SPP 1580, HI 1511/1-1)
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (31003A, 125369)
  • Bundesministerium für Bildung und Forschung (03Z1CN21, 0315834C)
  • Eidgenössische Technische Hochschule Zürich
  • Turun Yliopisto
  • Universidade de Lisboa
  • Université de Genève
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Legionella and Acanthamoeba research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
Legionella pneumophila, Legionella-containing vacuole, Rab GTPases, phosphatidylinositol 4-phosphate, host-pathogen interaction, macrophages, bacterial replication, endosomal trafficking, secretory trafficking, Rab21, Rab32, Rab8a, Rab14, Rab5a, Rab4, Rab9, phosphorus metabolism, phagosome formation
MeSH terms
Animals, Bacterial Proteins, Dictyostelium, Humans, Macrophages, Vacuoles, Legionella pneumophila, Proteome, rab GTP-Binding Proteins, Cell Line, Tumor, Mice, Host-Pathogen Interactions

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