ArticlePLoS biology2026
Caveolin 1 is a conserved host factor mediating Bacillus cereus hemolysin BL toxin cytolytic toxicity.
Article in PLoS biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Hemolysin BL (HBL) is a tripartite α‑pore‑forming toxin and a major Bacillus cereus virulence factor. Although LITAF and its homolog CDIP1 were previously identified as host receptors that promote HBL‑induced cytolysis, mice lacking both proteins remain only partially protected, indicating the existence of additional determinants of susceptibility. Using genome‑wide CRISPR knockout screens in Litaf-/-/Cdip1-/- mouse embryonic fibroblasts and human HT1080 cells, we identify caveolin‑1 (CAV1), a caveola‑associated membrane protein, as a third conserved host factor required for HBL cytolytic activity. Confocal imaging and co‑immunoprecipitation analyses show that CAV1 colocalizes with HBL and physically associates with the toxin at the plasma membrane. Notably, mice lacking all three factors (Litaf/Cdip1/Cav1 triple knockouts) are completely resistant to HBL toxin challenge, establishing CAV1 as an additional host factor mediating HBL toxin cytotoxicity. These findings define a tripartite host factor system required for HBL toxin activity and position CAV1 as an additional host determinant to B. cereus virulence.
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