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(A) Detailed view of Hot═Tap turn mimic coordinating directly to the neighboring subunit and indirectly via three water molecules (wat1, wat2, and wat3). (B) Detailed view of the Hot═Tap dipeptides in the six overlayed structures of Fig. 4B. Five chains (shown transparently) adopt an E1 envelope conformation for the thiazolidine ring of Hot═Tap, whereas the thiazolidine ring of chain C shows two alternative puckers (salmon: E1; green: E2).
