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Four clear examples of the presence of Lys‐CH2‐Cys crosslinks in the PDB. A, B: MtHPP structure (PDB ID: 5eqa) original and with the bridging methylene group, respectively. The remaining panels are organized in the same manner and present: (C,D) 1es5 structure; (E, F), 2xhi; (G, H), 3czg. In (A–F) the 2F o‐F c maps (blue) are contoured at 3σ, F o‐F c maps (green) at 7σ, whereas the respective levels in panels (G,H) are 2σ and 6σ.
