IRG and GBP host resistance factors target aberrant, "non-self" vacuoles characterized by the missing of "self" IRGM proteins.
Journal Article (Journal Article)
Interferon-inducible GTPases of the Immunity Related GTPase (IRG) and Guanylate Binding Protein (GBP) families provide resistance to intracellular pathogenic microbes. IRGs and GBPs stably associate with pathogen-containing vacuoles (PVs) and elicit immune pathways directed at the targeted vacuoles. Targeting of Interferon-inducible GTPases to PVs requires the formation of higher-order protein oligomers, a process negatively regulated by a subclass of IRG proteins called IRGMs. We found that the paralogous IRGM proteins Irgm1 and Irgm3 fail to robustly associate with "non-self" PVs containing either the bacterial pathogen Chlamydia trachomatis or the protozoan pathogen Toxoplasma gondii. Instead, Irgm1 and Irgm3 reside on "self" organelles including lipid droplets (LDs). Whereas IRGM-positive LDs are guarded against the stable association with other IRGs and GBPs, we demonstrate that IRGM-stripped LDs become high affinity binding substrates for IRG and GBP proteins. These data reveal that intracellular immune recognition of organelle-like structures by IRG and GBP proteins is partly dictated by the missing of "self" IRGM proteins from these structures.
Full Text
Duke Authors
Cited Authors
- Haldar, AK; Saka, HA; Piro, AS; Dunn, JD; Henry, SC; Taylor, GA; Frickel, EM; Valdivia, RH; Coers, J
Published Date
- 2013
Published In
Volume / Issue
- 9 / 6
Start / End Page
- e1003414 -
PubMed ID
- 23785284
Pubmed Central ID
- PMC3681737
Electronic International Standard Serial Number (EISSN)
- 1553-7374
Digital Object Identifier (DOI)
- 10.1371/journal.ppat.1003414
Language
- eng
Conference Location
- United States