1ru0 | pdb_00001ru0

Crystal structure of DCoH2, a paralog of DCoH, the Dimerization Cofactor of HNF-1

spinqualitylabelsall models 1ru0, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ru0 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: 4a-hydroxytetrahydrobiopterin dehydratase, with EC number 4.2.1.96 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PHS2_MOUSE] Involved in tetrahydrobiopterin biosynthesis. Seems to both prevent the formation of 7-pterins and accelerate the formation of quinonoid-BH2 (By similarity). Regulates the dimerization of homeodomain protein HNF-1-alpha and enhances its transcriptional activity. 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 An inherited form of diabetes, maturity-onset diabetes of the young type 3 (MODY3), results from mutations in the transcriptional activator, hepatocyte nuclear factor-1alpha (HNF1alpha). Transcription by HNF1alpha is stimulated by the bifunctional coactivator DCoH (dimerization cofactor of HNF1). Strikingly, an HNF1alpha deletion in mice causes more severe phenotypes than a DCoH deletion. It has been hypothesized that a DCoH homolog, DCoH2, partially complements the DCoH deletion. To test this idea, we determined the biochemical properties and the 1.6-A-resolution crystal structure of DCoH2. Like DCoH, DCoH2 forms a tetramer, displays pterin-4alpha-carbinolamine dehydratase activity, and binds HNF1alpha in vivo and in vitro. DCoH and DCoH2 adopt identical folds with structural differences confined largely to the protein surfaces and the tetramer interface. In contrast to the hyperstable DCoH tetramer, DCoH2 readily disproportionates and forms a 2:2 complex with HNF1 in vitro. Phylogenetic analysis reveals six major subfamilies of DCoH proteins, including unique DCoH and DCoH2 branches in metazoans. These results suggest distinct roles for DCoH and DCoH2. Differences in conserved surface residues could mediate binding to different effectors. We propose that HNF1alpha binding kinetics may distinguish regulation by DCoH2, under thermodynamic control, from regulation by DCoH, under kinetic control. Biochemical and structural basis for partially redundant enzymatic and transcriptional functions of DCoH and DCoH2.,Rose RB, Pullen KE, Bayle JH, Crabtree GR, Alber T Biochemistry. 2004 Jun 15;43(23):7345-55. PMID:15182178 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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