Fig. 5From: Structures of EccB1 and EccD1 from the core complex of the mycobacterial ESX-1 type VII secretion systemDimerization of cyto-EccD1mt creates a negatively charged groove. a cyto-EccD1mt dimer is shown in cartoon representation underneath a semitransparent surface. Clustered acidic residues are shown in stick representation. b Electrostatic surface calculated using the APBS server [54] with protonation states at pH 7.0 assigned by PROPKA [55]. The surface was colored +10 eV (blue) to −10 eV (red)Back to article page