Figure 2.
Bending motions of the S protein in a viral membrane. (A) Illustrative snapshot of the S protein and definition of angles/dihedrals measured to characterize the stalk motion. (B) Probability distribution of the bending angle for each HR2 linker and HR2-TM linker model. (C) Probability distributions of tilt angles for the resampled S protein structures compared to the experimental observation.13 The tilting angle is defined by the principal axis of the S protein head and the membrane normal.