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Overall structure of Dda_ykkC and detailed cross-helix interactions. (A) Cartoon representation of guanidinium (cyan) bound Dda_ykkC. Surface representation showing boot-like shape (bottom inset). (B) Detailed non-WC contacts in L1 region including AG aDNB and cross-helix contacts (inset). (C) Minor groove interaction between P3 A-loop and L1. Ribose zipper contacts are shown from the front (left) and base-specific contacts from the rear (right).
