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A-C) The crystal structures of (A) MreB (PDB ID: 1JCG), (B) ParM (PDB ID: 1MWM), and (C) crenactin (PDB ID: 4CJ7) display a characteristic U-shaped actin-like fold described by four subdomains surrounding an enclosed ATP-binding pocket (gray). (D) The crystal structure of FtsA (PDB ID: 4A2B) shows a domain swap of IB to IC.
