1gsf
From Proteopedia
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| , resolution 2.7Å | |||||||
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| Ligands: | |||||||
| Activity: | Glutathione transferase, with EC number 2.5.1.18 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
GLUTATHIONE TRANSFERASE A1-1 COMPLEXED WITH ETHACRYNIC ACID
Overview
BACKGROUND: Glutathione transferases (GSTs) constitute a family of isoenzymes that catalyze the conjugation of the tripeptide glutathione with a wide variety of hydrophobic compounds bearing an electrophilic functional group. Recently, a number of X-ray structures have been reported which have defined both the glutathione- and the substrate-binding sites in these enzymes. The structure of the glutathione-free enzyme from a mammalian source has not, however, been reported previously. RESULTS: We have solved structures of a human alpha-class GST, isoenzyme A1-1, both in the unliganded form and in complexes with the inhibitor ethacrynic acid and its glutathione conjugate. These structures have been refined to resolutions of 2.5 A, 2.7 A and 2.0 A respectively. Both forms of the inhibitor are clearly present in the associated electron density. CONCLUSIONS: The major differences among the three structures reported here involve the C-terminal alpha-helix, which is a characteristic of the alpha-class enzyme. This helix forms a lid over the active site when the hydrophobic substrate binding site (H-site) is occupied but it is otherwise disordered. Ethacrynic acid appears to bind in a non-productive mode in the absence of the coenzyme glutathione.
About this Structure
1GSF is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structural analysis of human alpha-class glutathione transferase A1-1 in the apo-form and in complexes with ethacrynic acid and its glutathione conjugate., Cameron AD, Sinning I, L'Hermite G, Olin B, Board PG, Mannervik B, Jones TA, Structure. 1995 Jul 15;3(7):717-27. PMID:8591048
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