FIG. 1.

Localization of heptose modifications. The sequences of the glycosylated peptides identified in this study are underlined on a schematic representation of the preproprotein showing the N-terminal signal sequence required for inner membrane translocation, a region encompassing 35 imperfect 19-amino-acid repeats (gray boxes) and the autoproteolytic cleavage site separating mature AIDA-I from the membrane-embedded AIDAc. The shaded residues correspond to the consensus sequence of the imperfect repeats. Numbering corresponds to the positions of the amino acids in the preproprotein. In several peptides, a heptose residue could be identified on threonine or serine residues. These residues are circled in the sequence.