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| | {{STRUCTURE_1pgt| PDB=1pgt | SCENE= }} | | {{STRUCTURE_1pgt| PDB=1pgt | SCENE= }} |
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| - | '''CRYSTAL STRUCTURE OF HUMAN GLUTATHIONE S-TRANSFERASE P1-1[V104] COMPLEXED WITH S-HEXYLGLUTATHIONE'''
| + | ===CRYSTAL STRUCTURE OF HUMAN GLUTATHIONE S-TRANSFERASE P1-1[V104] COMPLEXED WITH S-HEXYLGLUTATHIONE=== |
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| - | ==Overview==
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| - | Complex structures of a naturally occurring variant of human class pi glutathione S-transferase 1-1 (hGSTP1-1) with either S-hexylglutathione or (9R,10R)-9-(S-glutathionyl)-10-hydroxy-9, 10-dihydrophenanthrene [(9R,10R)-GSPhen] have been determined at resolutions of 1.8 and 1.9 A, respectively. The crystal structures reveal that the xenobiotic substrate-binding site (H-site) is located at a position similar to that observed in class mu GST 1-1 from rat liver (rGSTM1-1). In rGSTM1-1, the H-site is a hydrophobic cavity defined by the side chains of Y6, W7, V9, L12, I111, Y115, F208, and S209. In hGSTP1-1, the cavity is approximately half hydrophobic and half hydrophilic and is defined by the side chains of Y7, F8, V10, R13, V104, Y108, N204, and G205 and five water molecules. A hydrogen bond network connects the five water molecules and the side chains of R13 and N204. V104 is positioned such that the introduction of a methyl group (the result of the V104I mutation) disturbs the H-site water structure and alters the substrate-binding properties of the isozyme. The hydroxyl group of Y7 forms a hydrogen bond (3.2 A) with the sulfur atom of the product. There is a short hydrogen bond (2.5 A) between Y108 (OH) and (9R, 10R)-GSPhen (O5), indicating the hydroxyl group of Y108 as an electrophilic participant in the addition of glutathione to epoxides. An N-(2-hydroxethyl)piperazine-N'-2-ethanesulfonic acid (HEPES) molecule is found in the cavity between beta2 and alphaI. The location and properties of this HEPES-binding site fit a possible non-substrate-binding site that is involved in noncompetitive inhibition of the enzyme.
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| | + | {{ABSTRACT_PUBMED_9245401}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Pi class]] | | [[Category: Pi class]] |
| | [[Category: Transferase]] | | [[Category: Transferase]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:04:11 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 07:37:38 2008'' |
Revision as of 04:37, 28 July 2008
Template:STRUCTURE 1pgt
CRYSTAL STRUCTURE OF HUMAN GLUTATHIONE S-TRANSFERASE P1-1[V104] COMPLEXED WITH S-HEXYLGLUTATHIONE
Template:ABSTRACT PUBMED 9245401
About this Structure
1PGT is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structure and function of the xenobiotic substrate-binding site and location of a potential non-substrate-binding site in a class pi glutathione S-transferase., Ji X, Tordova M, O'Donnell R, Parsons JF, Hayden JB, Gilliland GL, Zimniak P, Biochemistry. 1997 Aug 12;36(32):9690-702. PMID:9245401
Page seeded by OCA on Mon Jul 28 07:37:38 2008
