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Structure of R. palustris cyt c′ (Q1A/F32W/W72F) (Protein Data Bank ID code 1MQV) (44). The side chains of W72 (purple) and W32 (blue) are highlighted [the W72 orientation was modeled on the basis of the WT structure (47)]. The heme iron is axially ligated to H117 shown in green. Helices I, II, III, and IV are constructed from the residues of 4–26, 34–54, 75–95, and 99–120, respectively.
