Abstract
It is unknown how Legionella pneumophila cells escape the degradative lysosomal pathway after phagocytosis by macrophages and replicate in an organelle derived from the endoplasmic reticulum. Here we show that, after internalization, L. pneumophila-containing phagosomes recruit early secretory vesicles. Once L. pneumophila phagosomes have intercepted early secretory vesicles they begin to acquire proteins residing in transitional and rough endoplasmic reticulum. The functions of Sar1 and ADP-ribosylation factor-1 are important for biogenesis of the L. pneumophila replicative organelle. These data indicate that L. pneumophila intercepts vesicular traffic from endoplasmic-reticulum exit sites to create an organelle that permits intracellular replication and prevents destruction by the host cell.
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Acknowledgements
We thank J. Donaldson (plasmids encoding ARF1), F. Gorelick (Sec31 antibodies), J. Lippincott-Schwartz (plasmid encoding GFP–p58), R. Pepperkok (plasmids encoding Sar1) and G. Warren (giantin, calnexin and COPI antibodies) for generously providing reagents, and A. Neild, O. Rossanese, W. Mothes, L. Pelletier and G. Warren for their many helpful discussions. This work was supported by NIH Grant AI41699.
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Supplementary figures
Figure S1. GFP-p58 does not colocalize with phagosomes containing dotA mutants. (PDF 1829 kb)
Figure S2. The effects of nocodazole and BFA on the distribution of GFPp58 in macrophages.
Figure S3 ER exit sites are not found juxtaposed to dotA LCPs.
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Kagan, J., Roy, C. Legionella phagosomes intercept vesicular traffic from endoplasmic reticulum exit sites. Nat Cell Biol 4, 945–954 (2002). https://doi.org/10.1038/ncb883
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DOI: https://doi.org/10.1038/ncb883
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