Abstract:
:Deficiency in mevalonate kinase (MVK) causes systemic inflammation. However, the molecular mechanisms linking the mevalonate pathway to inflammation remain obscure. Geranylgeranyl pyrophosphate, a non-sterol intermediate of the mevalonate pathway, is the substrate for protein geranylgeranylation, a protein post-translational modification that is catalyzed by protein geranylgeranyl transferase I (GGTase I). Pyrin is an innate immune sensor that forms an active inflammasome in response to bacterial toxins. Mutations in MEFV (encoding human PYRIN) result in autoinflammatory familial Mediterranean fever syndrome. We found that protein geranylgeranylation enabled Toll-like receptor (TLR)-induced activation of phosphatidylinositol-3-OH kinase (PI(3)K) by promoting the interaction between the small GTPase Kras and the PI(3)K catalytic subunit p110δ. Macrophages that were deficient in GGTase I or p110δ exhibited constitutive release of interleukin 1β that was dependent on MEFV but independent of the NLRP3, AIM2 and NLRC4 inflammasomes. In the absence of protein geranylgeranylation, compromised PI(3)K activity allows an unchecked TLR-induced inflammatory responses and constitutive activation of the Pyrin inflammasome.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Akula MK,Shi M,Jiang Z,Foster CE,Miao D,Li AS,Zhang X,Gavin RM,Forde SD,Germain G,Carpenter S,Rosadini CV,Gritsman K,Chae JJ,Hampton R,Silverman N,Gravallese EM,Kagan JC,Fitzgerald KA,Kastner DL,Golenbock DT,Berdoi
10.1038/ni.3487subject
Has Abstractpub_date
2016-08-01 00:00:00pages
922-9issue
8eissn
1529-2908issn
1529-2916pii
ni.3487journal_volume
17pub_type
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