FIG. 1.

Structure of Fosβ and Junβ hybrid proteins. (A) Organization of significant inserts in plasmids pFosβ and pJunβ, encoding, respectively, Fosβ and Junβ hybrids. The position of the pelB signal sequence (ss), the E tag, the leucine zippers, and the igAβ gene segments are indicated as well as the lac promoter (plac). Sizes are symbolic. (B) Predicted topology of the Fosβ and Junβ hybrids in the bacterial OM, with the leucine zipper domains exposed to the external medium and the oligomeric AT complex in the bacterial OM (49). (C) Putative interactions between two bacteria expressing Fosβ and Junβ proteins.