1uwl

1.76A STRUCTURE OF UROCANATE HYDRATASE FROM PSEUDOMONAS PUTIDA

spinqualitylabelsall models 1uwl, resolution 1.76Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1uwl is a 2 chain structure with sequence from "bacillus_fluorescens_putidus"_flugge_1886 "bacillus fluorescens putidus" flugge 1886. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAD Related: 1uwk, 1w1u Activity: Urocanate hydratase, with EC number 4.2.1.49 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Urocanase (EC 4.2.1.49) from Pseudomonas putida was crystallized after removing one of the seven free thiol groups. The crystal structure was solved by multiwavelength anomalous diffraction (MAD) using a seleno-methionine derivative and then refined at 1.14 A resolution. The enzyme is a symmetric homodimer of 2 x 557 amino acid residues with tightly bound NAD+ cofactors. Each subunit consists of a typical NAD-binding domain inserted into a larger core domain that forms the dimer interface. The core domain has a novel chain fold and accommodates the substrate urocanate in a surface depression. The NAD domain sits like a lid on the core domain depression and points with the nicotinamide group to the substrate. Substrate, nicotinamide and five water molecules are completely sequestered in a cavity. Most likely, one of these water molecules hydrates the substrate during catalysis. This cavity has to open for substrate passage, which probably means lifting the NAD domain. The observed atomic arrangement at the active center gives rise to a detailed proposal for the catalytic mechanism that is consistent with published chemical data. As expected, the variability of the residues involved is low, as derived from a family of 58 proteins annotated as urocanases in the data banks. However, one well-embedded member of this family showed a significant deviation at the active center indicating an incorrect annotation. Structure and action of urocanase.,Kessler D, Retey J, Schulz GE J Mol Biol. 2004 Sep 3;342(1):183-94. PMID:15313616 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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