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Fig. 2 | BMC Bioinformatics

Fig. 2

From: Evolutionary relationships between heme-binding ferredoxin α + β barrels

Fig. 2

A comparative view of the packing topologies of the ferredoxin α + β barrels. (a-f) Left-side diagrams show a top view of the barrels with β-strands indicated as triangles and α-helices as circles. Right-side diagrams show an opened-up view of the barrel with two ferredoxin-like domains placed side-by-side to show β-strand interactions. Only one pair of interacting β-strands can be seen as the other pair is formed by the peripheral-β-strands. The linear arrangement of the secondary structure elements is shown above the opened-up view, with β-strands indicated as arrows and α-helices as rectangles. Each barrel is constituted of four β-α-β units from two ferredoxin-like domains, colored blue, green, yellow and red. Heme is shown as a black star in all but H. thermophilus siroheme decarboxylase where it is shown as a white dotted-outlined star. N- and C-termini of the protein chains are labeled ‘N’ and ‘C’ in black while those of individual ferredoxin-like domains in barrels with duplicated domains are in pink

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