4ygs

Crystal structure of HAD phosphatase from Thermococcus onnurineus

spinqualitylabelsall models 4ygs, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ygs is a 1 chain structure with sequence from Theon. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CIT, MG Related: 4ygq, 4ygr Gene: TON_0338 (THEON) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Proteins in the haloalkaloic acid dehalogenase (HAD) superfamily, which is one of the largest enzyme families, is generally composed of a catalytic core domain and a cap domain. Although proteins in this family show broad substrate specificities, the mechanisms of their substrate recognition are not well understood. In this study, we identified a new substrate binding motif of HAD proteins from structural and functional analyses, and propose that this motif might be crucial for interacting with hydrophobic rings of substrates. The crystal structure of TON_0338, one of the 17 putative HAD proteins identified in a hyperthermophilic archaeon, Thermococcus onnurineus NA1, was determined as an apo-form at 2.0 A resolution. In addition, we determined the crystal structure TON_0338 in complex with Mg2+ or N-cyclohexyl-2-aminoethanesulfonic acid (CHES) at 1.7 A resolution. Examination of the apo-form and CHES-bound structures revealed that CHES is sandwiched between Trp58 and Trp61, suggesting that this Trp sandwich might function as a substrate recognition motif. In the phosphatase assay, TON_0338 was shown to have high activity for flavin mononucleotide (FMN), and the docking analysis suggested that the flavin of FMN may interact with Trp58 and Trp61 in a way similar to that observed in the crystal structure. Moreover, the replacement of these tryptophan residues significantly reduced the phosphatase activity for FMN. Our results suggest that WxxW may function as a substrate binding motif in HAD proteins, and expand the diversity of their substrate recognition mode. Structural basis for the substrate selectivity of a HAD phosphatase from Thermococcus onnurineus NA1.,Ngo TD, Van Le B, Subramani VK, Thi Nguyen CM, Lee HS, Cho Y, Kim KK, Hwang HY Biochem Biophys Res Commun. 2015 Apr 6. pii: S0006-291X(15)00647-6. doi:, 10.1016/j.bbrc.2015.03.179. PMID:25858319 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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