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. Author manuscript; available in PMC: 2009 Aug 14.
Published in final edited form as: Proteins. 2008 Nov 15;73(3):690–704. doi: 10.1002/prot.22097

Figure 4.

Figure 4

Ligand orientations of bis-his heme binding motifs. Correlation plot of the two alpha angles for bis-His heme systems are shown for (A) b-type heme binding motifs and (B) c-type heme binding motifs, nonredundant set (open circles) and redundant set (closed circles). The top and bottom histidine is defined by the right hand rule (see text). The histidine in the CXXCH motif is always on the top of the heme. The lines represent the relative orientation of the two His ligands: parallel (solid), perpendicular (dashed) or anti-parallel (dotted).