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The outer membrane (OM) vitamin B 12 receptor, BtuB, is the primary receptor for E group colicin adsorption to Escherichia coli. Cell death by this family of toxins requires the OM porin OmpF but its role remains elusive. We show that OmpF enhances the ability of purified BtuB to protect bacteria against the endonuclease colicin E9, demonstrating either that the two OM proteins form the...
Background: E colicin proteins have three functional domains, each of which is implicated in one of the stages of killing Escherichia coli cells: receptor binding, translocation and cytotoxicity. The central (R) domain is responsible for receptor-binding activity whereas the N-terminal (T) domain mediates translocation, the process by which the C-terminal cytotoxic domain is transported from the receptor...
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