Fig. 3

Structure of the STAS dimers of RsbR and RsbS. a Structure of the RsbR STAS dimer. The protein is shown in cyan blue ribbon representation. Residues participating in the dimer interface are shown in ball and stick representation with C, O, and N atoms color-coded in cyan blue, red, and dark blue, respectively. Residue numbers and secondary structure labels are provided, as well as the location of the dimer interface, the flexible loop and the C-terminal tail. b Structure of RsbS STAS dimer. The protein as well as interface residues are shown as in (a), except for the ribbon and the C atoms are color-coded red. c Superposition of the STAS domain structures of RsbR and RsbS. d Structure-based sequence alignment of RsbR and RsbS STAS domains. Residue numbers are provided for both proteins, as well as the location of the C-terminal tail of RsbR. Secondary structures are shown on top of the sequence alignment