FIG. 3.

Comparison of the deduced amino acid sequences of the HgbA, HgbB, and HgbC proteins from NTHI strain N182. The asterisks indicate identical amino acids, and the dots indicate conservative amino acid substitutions. The arrowhead indicates the position of the putative signal peptidase I cleavage site. The bracket indicates the amino acids encoded by the CCAA repeats. The seven boxes enclose the amino acid sequences that have homology with other TonB-dependent proteins (16, 41).