Fig. 7.

The SoxB–SoxY interface. (A) Backbone alignment of T. thermophilus SoxYZ from the SoxB–SoxYZ complex (SoxY orange; SoxZ yellow; carrier arm red) with P. pantotrophus SoxYZ (PDB ID code 2OX5; SoxY cyan; SoxZ light blue; carrier arm blue). The rmsd between the structures is 1.6 Å over 78 equivalent Cα atoms. (B) Position of the SoxY carrier arm within the SoxB active site channel. SoxY (orange) and SoxZ (yellow) are shown in ribbon representation with the carrier arm in sticks representation. SoxB is shown as a section through a space-filling model. The manganese atoms are shown as purple spheres. (C) Molecular details of the interactions between SoxY and SoxB with relevant residues shown in stick representation and the manganese atoms as purple spheres. The SoxY ⁶⁵PAIAES⁷⁰ loop is highlighted in green.