Structure of KpsC-N D160N Kdo adduct.A, shows the overall structure of KpsC-N in cartoon representation, with CMP and Kdo represented in yellow sticks. B, shows a surface view, from the approximate perspective of the gray arrow in panel (A). C and D, show orthogonal views of the electron density map around the D160N–Kdo adduct, contoured at 1.0 σ. Details of interactions mediated by the D160N–Kdo adduct are highlighted in (E), while (F) presents an equivalent view of the structure of WbbBGT99 D232N–Kdo adduct complex.