Figure 8. Salt-bridge interactions of Glu310 impact the DFG flip.
(a) Probability of forming the R409–E310 salt bridge in the DFG-in (blue) and DFG-out (red) states as a function of simulation pH. A representative snapshot of the R409–E310 salt bridge in a DFG-out state is shown on the top. (b) Probability of forming the R385–E310 salt bridge in the DFG-in (blue) and DFG-out (red) states as a function of simulation pH. A representative snapshot of the R385–E310 salt bridge in the DFG-in state is shown on the top. A salt bridge was considered present if the minimum distance between the carboxylate oxygens of Glu and the guanidinium nitrogens of Arg is at most 4 Å.