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Interactions between VacA protomers in the hexamer (OA-1). (A) Cryo-EM map of the VacA hexamer. (B) Model of the VacA hexamer. (C) The protomer–protomer intermolecular interactions including multiple side-chain hydrogen bonds and salt bridges. (D) The 293ProPro294 and 351GlyGly352 motifs (28) probably control the orientation of the protruding segment from p55. The glycines are shown in sphere and colored by element for clarity.
