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Ubiquitination of Listeria Virulence Factor InlC Contributes to the Host Response to Infection

2019; American Society for Microbiology; Volume: 10; Issue: 6 Linguagem: Inglês

10.1128/mbio.02778-19

2161-2129

Edith Gouin, Damien Balestrino, Orhan Raşid, Marie‐Anne Nahori, Véronique Villiers, Francis Impens, Stevenn Volant, Thomas Vogl, Yves Jacob, Olivier Dussurget, Pascale Cossart,

Redox biology and oxidative stress

The pathogenic potential of Listeria monocytogenes relies on the production of an arsenal of virulence determinants that have been extensively characterized, including surface and secreted proteins of the internalin family. We have previously shown that the Listeria secreted internalin InlC interacts with IκB kinase α to interfere with the host immune response (E. Gouin, M. Adib-Conquy, D. Balestrino, M.-A. Nahori, et al., Proc Natl Acad Sci USA, 107:17333–17338, 2010, https://doi.org/10.1073/pnas.1007765107 ). In the present work, we report that InlC is monoubiquitinated on K 224 upon infection of cells and provide evidence that ubiquitinated InlC interacts with and stabilizes the alarmin S100A9, which is a critical regulator of the immune response and inflammatory processes. Additionally, we show that ubiquitination of InlC causes an increase in reactive oxygen species production by neutrophils in mice and restricts Listeria infection. These findings are the first to identify a posttranscriptional modification of an internalin contributing to host defense.