Figure 6. Close up view of the Aio Rieske 2Fe-2S cluster.

A wall eye stereo superposition of NT-26 (yellow cartoon, with sticks having yellow coloured carbon atoms), A. faecalis (teal cartoon, with sticks having white coloured carbon atoms) and R. sphaeroides (2qjk) bc ₁ complex (salmon cartoon, with sticks having cyan coloured carbon atoms). Nitrogen atoms are coloured blue, oxygen atoms coloured red and sulphur atoms green when shown in stick in all structures. The Rieske cluster from the NT-26 structure is shown with iron atoms as brown spheres and sulphur atoms as dull yellow spheres. The residues in the NT-26 are labelled and the corresponding atoms in the other structures are discussed in the text. The superposition was generated by using all backbone atoms from residue 104 to residue 110 in the NT-26 Aio structure as the template. This provides a more meaningful view of changes at the Rieske cluster than a simple all atom superposition.