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Crystal structure of the isolated G domain of ATL1 bound to GDP·Mg2+. A, the G domain structure displays weak crystal packing interactions that involve switch regions. The G domain (colored salmon), helix α4 (red), and a second protomer (white) are illustrated. B, comparison of the isolated G domain with either the engaged (PDB code 3Q5E; left) or relaxed cross-over (PDB code 3Q5D; right) structures (both black).
