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, J.F., Hayden, J.B., Gilliland, G.L., Zimniak, P.
(1997) Biochemistry 36: 9690-9702
- PubMed: 9245401
- DOI: 10.1021/bi970805s
- Primary Citation of Related Structures:  2PGT
- PubMed Abstract:
- Three-Dimensional Structure of Class Pi Glutathione S-Transferase from Human Placenta in Complex with S-Hexylglutathione at 2.8 A Resolution
Reinemer, P.,Dirr, H.W.,Ladenstein, R.,Huber, R.,Lo Bello, M.,Federici, G.,Parker, M.W.
(1992) J.Mol.Biol. 227: 214
- Structure and Function of the Xenobiotic Substrate Binding Site of a Glutathione S-Transferase as Revealed by X-Ray Crystallographic Analysis of Product Complexes with the Diastereomers of 9-(S-Glutathionyl)-10-Hydroxy-9,10-Dihydrophenanthrene
Ji, X.,Johnson, W.W.,Sesay, M.A.,Dickert, L.,Prasad, S.M.,Ammon, H.L.,Armstrong, R.N.,Gilliland, G.L.
(1994) Biochemistry 33: 1043
- Naturally Occurring Human Glutathione S-Transferase Gstp1-1 Isoforms with Isoleucine and Valine in Position 104 Differ in Enzymic Properties
Zimniak, P.,Nanduri, B.,Pikula, S.,Bandorowicz-Pikula, J.,Singhal, S.S.,Srivastava, S.K.,Awasthi, S.,Awasthi, Y.C.
(1994) Eur.J.Biochem. 224: 893
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 a ...
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.
ABL-Basic Research Program, National Cancer Institute-Frederick Cancer Research and Development Center, Maryland 21702, USA.