5f06

Crystal structure of glutathione transferase F7 from Populus trichocarpa

spinqualitylabelsall models 5f06, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5f06 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GSH, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The glutathione transferase (GST) gene family is divided into 14 classes in photosynthetic organisms. Among them, the Phi class (GSTF) is composed of a large number of genes that are often induced in response to environmental constraints due to their ability to detoxify xenobiotics, to their peroxidase activity and to their involvement in the biosynthesis and/or transport of secondary metabolites. However, the exact functions of GSTFs from many plants including Populus trichocarpa are unknown. Here, following GSTF1 characterization, we have performed a comparative analysis of the seven other GSTFs found in poplar by systematically evaluating the biochemical and enzymatic properties of the corresponding recombinant proteins and of variants mutated for active site residues and by determining the three-dimensional structures of several representatives. Owing to the presence of a cysteine with a pKa value around 5 in their active site, GSTF3, F7, and F8 displayed a thiol transferase activity in addition to the usual glutathione transferase and peroxidase activities. From structural analyses, it appeared that these dual biochemical properties originate from the existence of a certain variability in the beta1-alpha1 loop. This allows positioning of several active site residues at proximity of the glutathione molecule, which itself remains unchanged in GSTF three-dimensional structures. These results highlight the promiscuity of some GSTFs and that changes of active site residues in some isoforms during evolution generated functional diversity by modifying their activity profile. DATABASE: Structural data are available in the PDB under the accession numbers 5EY6, 5F05, 5F06, and 5F07. Structural plasticity among glutathione transferase Phi members: natural combination of catalytic residues confers dual biochemical activities.,Pegeot H, Mathiot S, Perrot T, Gense F, Hecker A, Didierjean C, Rouhier N FEBS J. 2017 Jun 16. doi: 10.1111/febs.14138. PMID:28622459 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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