Article abstract
Nature Immunology 8, 497 - 503 (2007)
Published online: 15 April 2007 | doi:10.1038/ni1459
A crucial function of SGT1 and HSP90 in inflammasome activity links mammalian and plant innate immune responses
Annick Mayor1,4, Fabio Martinon1,3,4, Thibaut De Smedt2, Virginie Pétrilli1 & Jürg Tschopp1
Abstract
The family of mammalian Nod-like receptors (NLRs) consists of critical intracellular immune proteins structurally related to plant resistance proteins. The NLRs NALP3 and IPAF, for example, can each form a multiprotein proinflammatory complex called the 'inflammasome', and mutations in the gene encoding Nod2, another NLR, are positively associated with Crohn disease. Here we show that many NLRs interacted with the ubiquitin ligase–associated protein SGT1 and heat-shock protein 90 (HSP90), both of which have plant orthologs essential for R-protein responses. 'Knockdown' of SGT1 by small interfering RNA or chemical inhibition of HSP90 abrogated inflammasome activity, and inhibition of HSP90 blocked Nod2-mediated activation of the transcription factor NF-
B and reduced NALP3-mediated gout-like inflammation in mice. Our data demonstrate a similarity in one type of innate immunity in plants and mammals that is consistent with convergent evolution of a shared mechanism.
- Department of Biochemistry, University of Lausanne, CH-1066 Epalinges, Switzerland.
- Apoxis, CH-1004 Lausanne, Switzerland.
- Present address: Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115, USA.
- These authors contributed equally to this work.
Correspondence to: Jürg Tschopp1 e-mail: jurg.tschopp@unil.ch
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