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The conserved CTD packing interface is important for the hemolytic activity of CAMP factor. (a) The nine residues at the H6–H7 surface involved in CTD packing are shown as sticks. (b) The CAMPF-9XA mutant (red) is virtually devoid of hemolytic activity. (c) 9XA-CTD, but not WT CTD, lacks the inhibitory effect on full-length CAMP factor. RBC, red blood cells; HEPES, 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid; HBS, HEPES-buffered saline.
