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Mechanical Network in Titin Immunoglobulin from Force Distribution Analysis

Figure 2

Force distribution in I27.

(A) Graph representation of changes in interatomic forces, , observed upon mechanical perturbation of I27. Edges connect non-bonded atom pairs with . The protein surface is shown in gray. A 3D animation of this figure is available as Video S1. (B) Changes in atomic forces, Δf, mapped onto the protein structure. Colors range from blue for elements outside the mechanical network with Δf = 0 to red for force bearing elements with high Δf. (C) Graph representation of displayed as edges as in (A). I27 is shown as cartoon. Edges connecting main-chain atoms are colored blue, those connecting side chain atoms are colored red. Mechanical load at the C-terminus is mainly taken up by main-chain interactions around the A'G strand, whereas at the N-terminal side forces are primarily propagating into the protein core by side chain interactions.

doi: https://doi.org/10.1371/journal.pcbi.1000306.g002