Figure 4. Alignment of the consensus sequences of the γ-proteobacterial (γ) and non-γ-proteobacterial (non-γ) β-barrel domains.

The amino acids depicted correspond to amino acids predicted to occur within or immediately adjacent to TMSs 4–8. The positions of the fully conserved residues within each of the two respective consensus sequences are indicated with asterisks (*) above and below the two sequences. Colons (close similarities), and dots (more distant similarities), are as defined for the GAP program. The consensus sequences are based on two separate multiple alignments generated for the β-domains of the 52 γ-proteobacterial proteins and the 17 non-γ-proteobacterial proteins, respectively. Symbols in-between the two consensus sequences indicate similarities and identities between these two consensus sequences.