3th7

Crystal structure of unliganded Co2+2-HAI (pH 7.0)

spinqualitylabelsall models 3th7, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3th7 is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CO Related: 3tf3, 2pha, 3the, 3thh, 3thj, 2aeb Gene: ARG1 (HUMAN) Activity: Arginase, with EC number 3.5.3.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease [ARGI1_HUMAN] Defects in ARG1 are the cause of argininemia (ARGIN) [MIM:207800]; also known as hyperargininemia. Argininemia is a rare autosomal recessive disorder of the urea cycle. Arginine is elevated in the blood and cerebrospinal fluid, and periodic hyperammonemia occurs. Clinical manifestations include developmental delay, seizures, mental retardation, hypotonia, ataxia, progressive spastic quadriplegia. Publication Abstract from PubMed The binuclear manganese metalloenzyme human arginase I (HAI) is a potential protein drug for cancer chemotherapy, in that it is capable of depleting extracellular l-Arg levels in the microenvironment of tumor cells that require this nutrient to thrive. Substitution of the native Mn(2+)(2) cluster with a Co(2+)(2) cluster in the active site yields an enzyme with enhanced catalytic activity at physiological pH ( approximately 7.4) that could serve as an improved protein drug for l-Arg depletion therapy [Stone, E. M., Glazer, E. S., Chantranupong, L., Cherukuri, P., Breece, R. M., Tierney, D. L., Curley, S. A., Iverson, B. L., and Georgiou, G. (2010) ACS Chem. Biol. 5, 333-342]. A different catalytic mechanism is proposed for Co(2+)(2)-HAI compared with that of Mn(2+)(2)-HAI, including an unusual Nepsilon-Co(2+) coordination mode, to rationalize the lower K(M) value of l-Arg and the lower K(i) value of l-Orn. However, we now report that no unusual metal coordination modes are observed in the cobalt-reconstituted enzyme. The X-ray crystal structures of unliganded Co(2+)(2)-HAI determined at 2.10 A resolution (pH 7.0) and 1.97 A resolution (pH 8.5), as well as the structures of Co(2+)(2)-HAI complexed with the reactive substrate analogue 2(S)-amino-6-boronohexanoic acid (ABH, pH 7.0) and the catalytic product l-Orn (pH 7.0) determined at 1.85 and 1.50 A resolution, respectively, are essentially identical to the corresponding structures of Mn(2+)(2)-HAI. Therefore, in the absence of significant structural differences between Co(2+)(2)-HAI and Mn(2+)(2)-HAI, we suggest that a higher concentration of metal-bridging hydroxide ion at physiological pH for Co(2+)(2)-HAI, a consequence of the lower pK(a) of a Co(2+)-bound water molecule compared with a Mn(2+)-bound water molecule, strengthens electrostatic interactions with cationic amino acids and accounts for enhanced affinity as reflected in the lower K(M) value of l-Arg and the lower K(i) value of l-Orn. Crystal structures of complexes with cobalt-reconstituted human arginase I.,D'Antonio EL, Christianson DW Biochemistry. 2011 Sep 20;50(37):8018-27. Epub 2011 Aug 26. PMID:21870783 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Arginase 3D structures

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