6ajd

Crystal structure of a monometallic dihydropyrimidinase from Pseudomonas aeruginosa PAO1 reveals no lysine carbamylation within the active site

spinqualitylabelsall models 6ajd, resolution 2.22Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ajd is a 2 chain structure with sequence from Pseudomonas aeruginosa PAO1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.223Å Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HYDA_PSEAE Catalyzes the hydrolysis of dihydropyrimidines and of the structurally related DL-5-mono-substituted hydantoins, to produce N-carbamoyl-D-amino acids. Publication Abstract from PubMed Dihydropyrimidinase (DHPase) is a member of the cyclic amidohydrolase family, which also includes allantoinase, dihydroorotase (DHOase), hydantoinase, and imidase. Almost all of these zinc metalloenzymes possess a binuclear metal center in which two metal ions are bridged by a post-translational carbamylated Lys. Crystal structure of Tetraodon nigroviridis DHPase reveals that one zinc ion is sufficient to stabilize Lys carbamylation. In this study, we found that one metal coordination was not sufficient to fix CO2 to the Lys in bacterial DHPase. We prepared and characterized mono-Zn DHPase from Pseudomonas aeruginosa (PaDHPase), and the catalytic activity of mono-Zn PaDHPase was not detected. The crystal structure of mono-Zn PaDHPase determined at 2.23A resolution (PDB entry 6AJD) revealed that Lys150 was no longer carbamylated. This finding indicated the decarbamylation of the Lys during the metal chelating process. To confirm the state of Lys carbamylation in mono-Zn PaDHPase in solution, mass spectrometric (MS) analysis was carried out. The MS result was in agreement with the theoretical value for uncarbamylated PaDHPase. Crystal structure of the human DHOase domain (huDHOase) K1556A mutant was also determined (PDB entry 5YNZ), and the structure revealed that the active site of huDHOase K1556A mutant contained one metal ion. Like mono-Zn PaDHPase, oxygen ligands of the carbamylated Lys were not required for Znalpha binding. Considering the collective data from X-ray crystal structure and MS analysis, mono-Zn PaDHPase in both crystalline state and solution was not carbamylated. In addition, structural evidences indicated that post-translational carbamylated Lys was not required for Znalpha binding in PaDHPase and in huDHOase. Crystal structures of monometallic dihydropyrimidinase and the human dihydroorotase domain K1556A mutant reveal no lysine carbamylation within the active site.,Cheng JH, Huang YH, Lin JJ, Huang CY Biochem Biophys Res Commun. 2018 Oct 28;505(2):439-444. doi:, 10.1016/j.bbrc.2018.09.153. Epub 2018 Sep 27. PMID:30268498 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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