Three-dimensional structure of Vc-HlyU. (a) Cartoon diagram of Vc-HlyU monomer showing the α1-α2-α3-α4-β1-β2-α5 fold. (b) Superimposition of Synechococcus SmtB (blue color), S. aureus CzrA (orange), S. aureus CadC (teal), and Vc-HlyU (magenta) monomers. (c) Ribbon diagram of Vc-HlyU dimer showing the secondary structural units. Monomer A and B are in magenta and blue colors, respectively. All figures were created with PyMOL .