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BclA C-terminal domain This is the C-terminal domain of BclA (Bacillus collagen-like protein of anthracis) which is expressed on spores of Bacillus species. Trimers of the C-terminal domain (CTD) form the tips of the spore's hair-like nap and are the immunodominant target of vertebrate antibodies and drive trimerization. Structure analysis indicate the C-terminal region of the peptide folding into an all-beta structure with a jelly-fold topology, similar to the first human complement C1q, a member of the tumor necrosis factor (TNF)-like family. The C-terminal globular domain has been shown to be located on the exterior of the exosporium, and therefore is critical in determining the immunogenicity of the spore in a mammalian host.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",