Additional file 6.

Figure S2. Alignments of ferredoxin and flavodoxin-like protein sequences of P.carbinolicus and its relatives. Ferredoxins of D. africanus, for which rates of electron transfer are known, and flavodoxins of E. coli and D. africanus are shown for comparison. Only double-4Fe4S-cluster ferredoxins have been detected in the partial genome sequence of D. acetoxidans, the closest relative of P. carbinolicus, which is able to operate a catabolic TCA cycle, but one of them has serine and aspartate in lieu of cysteine as two of the predicted ligands to iron atoms, and the other has two additional cysteine residues, which could affect their electron transfer properties. The existence of single-4Fe4S-cluster ferredoxins in D. acetoxidans cannot be ruled out.

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Aklujkar et al. BMC Genomics 2012 13:690   doi:10.1186/1471-2164-13-690