Figure 5.

An insertion in the Allochromatium tepidum α1-polypeptides.A, superposition of Cα carbons of the Allochromatium tepidum α1- and β1-polypeptides (color) with the corresponding Thermochromatium tepidum α- and β-polypeptides (gray) around the Ca²⁺- and BChl a-binding sites. Key residues that ligate to Ca²⁺ and BChl a are shown in sticks. B, expanded view of the loop region marked by the dashed line in (A) shows the position of the Thr40 insertion (red) and the alignment of sequences between A. tepidum and T. tepidum. BChl, bacteriochlorophyll.