Fig. 3: Electrostatic interactions involved in filament assembly.

a, Surface representation of the AlbAB filament with electrostatic coulombic potential displayed. b, An AlbB₂-AlbA₂ tetramer is shown (top). Dimers pulled apart to highlight interaction surface (bottom). AlbB displays negative surface charges at the dimer-dimer interface (yellow outline). c, An AlbA₂-AlbB₂ tetramer is shown (top). Dimers pulled apart to highlight interaction surface (bottom). AlbA displays positive surface charges at the dimer-dimer interface (yellow outline). d, Dimer-dimer interface highlighting significant positive charge surrounding the FMN binding site. e, Residues R41 and M78 of AlbB are located at the dimer-dimer interface forming parts of the FMN binding site.