GBP1 recruitment to actin-rich pedestals of extracellular Gram-negative bacteria promotes pyroptosis
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Daniel J Bennison Ishaan Chaudhary Dharitri Chaudhuri Justin Chun Ngai Wong Ayush Punwatkar Priyanka Biswas Miyu Stephenson Qiyun Zhong Wouter W Kallemeijn Marianne Guenot Sandra Koigi Diana Papp John P Thomas Dimple Dixit Tamas Korcsmaros Arthur M Talman Eva-Maria Frickel Edward W Tate Sandhya S Visweswariah Gad Frankel Avinash R ShenoyAbstract
The IFNγ-induced GTPase guanylate-binding protein 1 (GBP1) binds to lipopolysaccharide (LPS) on cytosolic gram-negative bacteria and promotes pyroptosis via the recruitment and activation of caspase-4 on the bacterial outer membrane. Enteropathogenic and enterohaemorrhagic Escherichia coli (EPEC and EHEC, respectively) are extracellular pathogens that adhere to host cells and stimulate dense actin polymerisation underneath their attachment sites, generating structures described as actin-rich pedestals. Here, we show that GBP1 traffics to actin-rich pedestals in human cells infected with EPEC or EHEC in vitro and mouse colonocytes infected with the EPEC-like murine pathogen Citrobacter rodentium in vivo. GBP1 promotes caspase-4 recruitment to actin-rich pedestals, leading to pyroptosis and IL-18 release. GBP1 mutants defective in LPS coatomer formation also localise to EPEC pedestals. A novel assay that mimics pathogenic effector activity reveals GBP1 recruitment to sterile actin polymerisation sites. We conclude that cytosolic GBP1 is mobilised to sites of pathogen-induced actin remodelling independently of LPS. Our study establishes that GBP1 not only operates as a pattern-recognition receptor but also orchestrates effector-triggered immunity against pathogens that hijack the actin cytoskeleton.
Journal details
Journal
EMBO Journal
Volume
45
Issue number
14
Pages
5046-5078
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10.1038/s44318-026-00830-z
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Europe PubMed Central
42265284
Pubmed
42265284
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