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Docking of the accessory domain. Crosslinking interactions between J3/4 C26 and AL4 U154 and U155 are summarized by black lines. Blue A151 bulge is required for efficient polymerization activity. Red residues in accessory domain are essential for activity. (Red circles) Increased Fe(II)-EDTA damage upon docking; (green circles) decreased Fe-EDTA(II) protection upon docking.
