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Proteolysis has a critical role in transmitting information within a biological system and therefore an important element of biology is to determine the subset of proteins amenable to proteolysis. Until recently, it has been thought that proteases cleave native protein substrates only within solvent exposed loops, but recent evidence indicates that cleavage sites located within α-helices can also...
AB 5 toxins are composed of an enzymatic A subunit that disrupts cellular function associated with a pentameric B subunit required for host cell invasion. EcxAB is an AB 5 toxin isolated from clinical strains of Escherichia coli classified as part of the cholera family due to B subunit homology. Cholera-group toxins have catalytic ADP-ribosyltransferases as their A subunits, so it...
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