Figure 1 Structure of EcppnP shows a cupin fold.(A ) The overall structure of monomeric Ec ppnP is shown by ribbon and colored by spectrum. (B ) Topological diagram of the structure of Ec ppnP. (C) The dimeric structure ofEc ppnP. The two protomers in the dimer conformation are colored as wheat and blue, respectively. (D) Dimer interface of Ec ppnP. The residues involved in dimerization are shown as the stick.