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Quaternary-structural features of deoxy T (PDB entries 2hhb or 2dn2; cyan), CO-ligated R (PDB entries 1aj9 or 1ljw; red) and CO-ligated Hb ζ2β2 s (yellow) structures. The structures were each superposed on the main-chain atoms of the invariant α1β1 and ζ1βs1 heterodimers. (a) Structural differences in the positions of the non-superposed α2β2 and ζ2βs2 heterodimers. (b) The α1–β2 (ζ1–βs2) interface showing the relative positions of the CD and FG corners. (c) The β-cleft.
