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We demonstrated previously that monocytes and macrophages are target cells for the Rho-modifying Clostridium botulinum C3 ADP-ribosyltransferase. Here, we report the construction, expression and characterization of a recombinant streptavidin-C3 fusion protein which allows for delivery of biotin-labelled molecules into the cytosol of macrophages via enzymatically inactive C3bot1E174Q. The enzyme domain...
The C2 toxin produced by Clostridium botulinum is a binary AB-type exotoxin composed of the enzyme subunit C2I and the binding/translocation moiety C2II. After proteolytic activation, C2IIa mediates the subsequent internalization of C2I into the cytosol of mammalian target cells. The N-terminal domain of C2I (C2IN) is necessary for C2IIa-dependent uptake, but lacks the enzyme domain that is responsible...
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