Figure 6

Apex cluster at the dimer interface. The triads formed from sequentially apart residues (x (A/B), x+2 (A/B), x+4 (B/A), where x is an arbitrary sequence number) at the top vertex found for all LuxS proteins under study (except for Bacillus sp. LuxS). The triad for 1j6x (class II) is depicted here; the backbone is represented as new cartoon and each monomer and the residues coming from it are coloured differently.