1axd
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(New page: 200px<br /><applet load="1axd" size="450" color="white" frame="true" align="right" spinBox="true" caption="1axd, resolution 2.5Å" /> '''STRUCTURE OF GLUTATHI...)
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Revision as of 09:03, 20 November 2007
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STRUCTURE OF GLUTATHIONE S-TRANSFERASE-I BOUND WITH THE LIGAND LACTOYLGLUTATHIONE
Overview
Glutathione S-transferases (GSTs) -I and -III are involved in herbicide, metabolism in maize and have been intensively studied. Starting with plant, tissue from Zea mays var. mutin recombinant GST-I was prepared by, heterologous expression in Escherichia coli. The enzyme was crystallized, in the presence of lactoylglutathione, a ligand formerly never observed in, a GST structure and known as an intermediate of the pharmacologically, relevant glyoxalase system. The crystal structure of GST-I has been, determined at 2.5 A resolution and exhibits the GST-typical dimer of two, identical subunits, each consisting of 214 residues. Compared with other, plant GSTs the three-dimensional structure of GST-I primarily shows, structural differences in the hydrophobic substrate binding site, the, linker segment and the C-terminal region. Furthermore, a comparison of the, ligand-bound GST-I structure with the apo structure of GST-III indicates, the movement of a ten-residue loop upon binding of the ligand to the, active site. This is the first structure-based evidence for an induced fit, mechanism of glutathione S-transferases, which has previously been, postulated for class pi enzymes. Together with GST-III, GST-I may explain, herbicide resistance and selectivity in maize as well as in other, agronomic relevant crops.
About this Structure
1AXD is a Single protein structure of sequence from Zea mays with LAC as ligand. Active as Glutathione transferase, with EC number 2.5.1.18 Full crystallographic information is available from OCA.
Reference
Crystal structure of herbicide-detoxifying maize glutathione S-transferase-I in complex with lactoylglutathione: evidence for an induced-fit mechanism., Neuefeind T, Huber R, Dasenbrock H, Prade L, Bieseler B, J Mol Biol. 1997 Dec 12;274(4):446-53. PMID:9417926
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