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- W4306168997 abstract "Spores are an infectious form of the zoonotic bacterial pathogen, Bacillus anthracis. The outermost spore layer is the exosporium, comprised of a basal layer and an external glycoprotein nap layer. The major structural proteins of the inner basal layer are CotY (at the mother cell central pole or bottlecap) and ExsY around the rest of the spore. The basis for the cap or noncap specificity of the CotY and ExsY proteins is currently unknown. We investigated the role of sequence differences between these proteins in localization during exosporium assembly. We found that sequence differences were less important than the timing of expression of the respective genes in the positioning of these inner basal layer structural proteins. Fusion constructs with the fluorescent protein fused at the N-terminus resulted in poor incorporation whereas fusions at the carboxy terminus of CotY or ExsY resulted in good incorporation. However, complementation studies revealed that fusion constructs, although accurate indicators of protein localization, were not fully functional. A model is presented that explains the localization patterns observed. Bacterial two-hybrid studies in Escherichia coli hosts were used to examine protein-protein interactions with full-length and truncated proteins. The N-terminus amino acid sequences of ExsY and CotY appear to be recognized by spore proteins located in the spore interspace, consistent with interactions seen with ExsY and CotY with the interspace proteins CotE and CotO, known to be involved with exosporium attachment." @default.
- W4306168997 created "2022-10-14" @default.
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- W4306168997 date "2022-10-01" @default.
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- W4306168997 title "Localization of the CotY and ExsY proteins to the exosporium basal layer of <i>Bacillus anthracis</i>" @default.
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- W4306168997 doi "https://doi.org/10.1002/mbo3.1327" @default.
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