6DAQ:
reference: Structural Characterization of the Hydratase-Aldolases, NahE and PhdJ: Implications for the Specificity, Catalysis, and N-Acetylneuraminate Lyase Subgroup of the Aldolase Superfamily., LeVieux JA, Medellin B, Johnson WH Jr, Erwin K, Li W, Johnson IA, Zhang YJ, Whitman CP, Biochemistry. 2018 Jun 26;57(25):3524-3536. doi: 10.1021/acs.biochem.8b00532., Epub 2018 Jun 11. PMID: 29856600

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).