LPS binding caspase activation and recruitment domains (CARDs) are bipartite lipid binding modules.

ABSTRACT: Caspase-11 is an innate immune pattern recognition receptor (PRR) that detects cytosolic bacterial lipopolysaccharides (LPS) through its caspase activation and recruitment domain (CARD). Caspase-11 also detects eukaryotic (i.e., self) lipids. This observation raises the question of whether common or distinct mechanisms govern caspase interactions with self- and nonself-lipids. In this study, using biochemical, computational, and cell-based assays, we report that the caspase-11 CARD functions as a bipartite lipid-binding module. Distinct regions within the CARD bind to phosphate groups and long acyl chains of self- and nonself-lipids. Self-lipid binding capability is conserved across numerous caspase-11 homologs and orthologs. The symmetry in self- and nonself-lipid detection mechanisms ena

SUBMITTER: Cao AB 

PROVIDER: S-EPMC11887843 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature