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Model of MreB assembly. (A) G-MreB subunits require Mg2+ and ATP to polymerize onto the F-MreB protofilament. Polymerization promotes flattening of the monomer (blue arrows) and restructuring of the nucleotide-binding pocket. (B and C) ATP-bound (B) and ADP-bound (C) MreB filaments adopt more and less curved conformations, respectively (orange and green arrows, respectively).
