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(A) Distance fluctuations for atoms (Cζ, Nη1, and Nη2 of Arg188; Cδ of Glu277) of the Arg188-Glu277 salt bridge. -▪-: Distance from CζArg188 to CδGlu277; -•-: distance from Nη1Arg188 to CδGlu277; and -▴-: distance from Nη2Arg188 to CδGlu277. (B) and (C) Typical interaction modes (B, Mode I; C, Mode II) of Arg188-Glu277 pair including relative water molecules.
