Supplementary Figure S4.

Amino-acid sequence alignment of TonB-dependent outermembrane receptors. Proteins encoded in P. gingivalis hmu (HmuR_A7436) and T. forsythia hmu-like (Tf_HmuR_I and Tf_HmuR_II) operons are shown. Conserved histidine (H), glutamic acid (E) residues and FRAP, NPNL motifs present in classical TonB-dependent receptors transporting heme are marked in red and blue, respectively.

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