Figure 6
Covalent modifications of TdcF. Stereoviews showing covalent modifications of TdcF. In both cases, 1.6 Å resolution 2mF obs - dF calc electron density maps are shown contoured at approximately 1 sigma. (A) a fully oxidised cysteine (cysteine sulfonic acid) is observed at position 36 in each subunit of all structures; (B) a carboxylated lysine in two alternative conformations that is visible in only the A chain of the 2-ketobutyrate-bound structure. Figure generated using PyMOL [31].