1j2u

Creatininase Zn

spinqualitylabelsall models 1j2u, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1j2u is a 6 chain structure with sequence from Pseudomonas putida. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.85Å Ligands: SO4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CRNA_PSEPU Cyclic amidohydrolase that catalyzes the reversible conversion of creatinine to creatine. Is also active toward glycocyamidine, though the reaction rate is very low, but it is completely inert toward hydantoin and its derivatives. 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 Creatininase from Pseudomonas putida is a member of the urease-related amidohydrolase superfamily. The crystal structure of the Mn-activated enzyme has been solved by the single isomorphous replacement method at 1.8A resolution. The structures of the native creatininase and the Mn-activated creatininase-creatine complex have been determined by a difference Fourier method at 1.85 A and 1.6 A resolution, respectively. We found the disc-shaped hexamer to be roughly 100 A in diameter and 50 A in thickness and arranged as a trimer of dimers with 32 (D3) point group symmetry. The enzyme is a typical Zn2+ enzyme with a binuclear metal center (metal1 and metal2). Atomic absorption spectrometry and X-ray crystallography revealed that Zn2+ at metal1 (Zn1) was easily replaced with Mn2+ (Mn1). In the case of the Mn-activated enzyme, metal1 (Mn1) has a square-pyramidal geometry bound to three protein ligands of Glu34, Asp45, and His120 and two water molecules. Metal2 (Zn2) has a well-ordered tetrahedral geometry bound to the three protein ligands of His36, Asp45, and Glu183 and a water molecule. The crystal structure of the Mn-activated creatininase-creatine complex, which is the first structure as the enzyme-substrate/inhibitor complex of creatininase, reveals that significant conformation changes occur at the flap (between the alpha5 helix and the alpha6 helix) of the active site and the creatine is accommodated in a hydrophobic pocket consisting of Trp174, Trp154, Tyr121, Phe182, Tyr153, and Gly119. The high-resolution crystal structure of the creatininase-creatine complex enables us to identify two water molecules (Wat1 and Wat2) that are possibly essential for the catalytic mechanism of the enzyme. The structure and proposed catalytic mechanism of the creatininase are different from those of urease-related amidohydrolase superfamily enzymes. We propose a new two-step catalytic mechanism possibly common to creatininases in which the Wat1 acts as the attacking nucleophile in the water-adding step and the Wat2 acts as the catalytic acid in the ring-opening step. Crystal structures of creatininase reveal the substrate binding site and provide an insight into the catalytic mechanism.,Yoshimoto T, Tanaka N, Kanada N, Inoue T, Nakajima Y, Haratake M, Nakamura KT, Xu Y, Ito K J Mol Biol. 2004 Mar 19;337(2):399-416. PMID:15003455 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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