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. 2013 Jun 6;8(6):e64746. doi: 10.1371/journal.pone.0064746

Figure 1. Force propagation along a polypeptide in water.

Figure 1

(a) After first equilibrating an (Ala)Inline graphic polypeptide under a relatively low stretching force of Inline graphic applied to both termini of the polypeptide, we then suddenly increase the stretching force by a factor of 10 to Inline graphic. As the polymer is straightened, backbone tension propagates from the two termini into the center of the chain. (b) Structure used in the MD simulation. The (Ala)Inline graphic polypeptide is surrounded by explicit solvent molecules. A constant force, Inline graphic or Inline graphic is applied to the terminal C-Inline graphic atoms, and the end-to-end distance Inline graphic of the peptide is measured.