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. 2019 Mar 13;116(14):6818–6827. doi: 10.1073/pnas.1814279116

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Copyright © 2019 the Author(s). Published by PNAS.

This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

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Fig. 2. — Analysis of catalytically primed structures. (A) Catalytically primed structure of insulin receptor kinase (PDB ID code 3BU5) with bound ATP and Mg²⁺ ion. Important interactions are marked with dashed lines. (B) Ramachandran plot of catalytically primed structures (those with bound ATP and Mg²⁺, a phosphorylated activation loop, and resolution ≤2.25 Å): X-DFG (residue before the DFGmotif, blue), DFG-Asp (green), DFG-Phe (orange), and DFG-Gly (red). The Ramachandran regions are marked A (alpha), B (beta), L (left), and E (epsilon). (C) Scatterplot of side-chain dihedral angles χ₁ and χ₂ for DFG-Asp (green) and DFG-Phe (orange) of catalytically primed structures. Asp is in a trans rotamer (χ₁ ∼ 180°) and Phe is in a g⁻ rotamer (χ₁ ∼ 300° or −60°).