6lg3

Publication Abstract from PubMed

Pyroptosis, an inflammatory form of programmed cell death, has been implicated in eliminating pathogenic infections. However, macrophage pyroptosis-related proteins from Mycobacterium tuberculosis (M.tb) have largely gone unexplored. Here, we identified a cell pyroptosis-inducing protein, Rv1579c, named EST12, secreted from the M.tb H37Rv region of difference 3. EST12 binds to the receptor for activated C kinase 1 (RACK1) in macrophages, and the EST12-RACK1 complex recruits the deubiquitinase UCHL5 to promote the K48-linked deubiquitination of NLRP3, subsequently leading to an NLRP3 inflammasome caspase-1/11-pyroptosis gasdermin D-interleukin-1beta immune process. Analysis of the crystal structure of EST12 reveals that the amino acid Y80 acts as a critical binding site for RACK1. An EST12-deficient strain (H37RvDeltaEST12) displayed higher susceptibility to M.tb infection in vitro and in vivo. These results provide the first proof that RACK1 acts as an endogenous host sensor for pathogens and that EST12-RACK1-induced pyroptosis plays a pivotal role in M.tb-induced immunity.

Mycobacterial EST12 activates a RACK1-NLRP3-gasdermin D pyroptosis-IL-1beta immune pathway.,Qu Z, Zhou J, Zhou Y, Xie Y, Jiang Y, Wu J, Luo Z, Liu G, Yin L, Zhang XL Sci Adv. 2020 Oct 23;6(43). pii: 6/43/eaba4733. doi: 10.1126/sciadv.aba4733., Print 2020 Oct. PMID:33097533^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.