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Figure 3
Ternary-structural transitions in each subunit. (a) Changes in the distance between the Cβ atom of Val E11 and the iron of the heme (yellow dashed line in the inset) for each subunit. The overall oxygen saturation of the crystals (horizontal axis) was determined as in Fig. 1[link]. (b) Superpositions around the heme of the A1 (left) and B2 (right) subunits. The stick models of fully oxygenated OliHb (PDB entry 2zs0; Numoto et al., 2008aBB17) and Crystals 1, 2, 3 and 4 are drawn in red, magenta, green, cyan and blue, respectively. The conformational changes in A1 Arg97 and B2 Arg101 are indicated by black arrows. (c) Superpositions of the tetrameric subassemblies. The color schemes are the same as in (b). The A and B helices of each subunit are labeled. Close-up views of the superpositions of the AB loops are shown in the right panels.

IUCrJ
Volume 8| Part 6| November 2021| Pages 954-962
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521009386