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1gti

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[[Image:1gti.gif|left|200px]]
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{{STRUCTURE_1gti| PDB=1gti | SCENE= }}
{{STRUCTURE_1gti| PDB=1gti | SCENE= }}
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'''MODIFIED GLUTATHIONE S-TRANSFERASE (PI) COMPLEXED WITH S (P-NITROBENZYL)GLUTATHIONE'''
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===MODIFIED GLUTATHIONE S-TRANSFERASE (PI) COMPLEXED WITH S (P-NITROBENZYL)GLUTATHIONE===
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==Overview==
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The three-dimensional structure of mouse liver glutathione S-transferase P1-1 carboxymethylated at Cys-47 and its complex with S-(p-nitrobenzyl)glutathione have been determined by x-ray diffraction analysis. The structure of the modified enzyme described here is the first structural report for a Pi class glutathione S-transferase with no glutathione, glutathione S-conjugate, or inhibitor bound. It shows that part of the active site area, which includes helix alphaB and helix 310B, is disordered. However, the environment of Tyr-7, an essential residue for the catalytic reaction, remains unchanged. The position of the sulfur atom of glutathione is occupied in the ligand-free enzyme by a water molecule that is at H-bond distance from Tyr-7. We do not find any structural evidence for a tyrosinate form, and therefore our results suggest that Tyr-7 is not acting as a general base abstracting the proton from the thiol group of glutathione. The binding of the inhibitor S-(p-nitrobenzyl)-glutathione to the carboxymethylated enzyme results in a partial restructuring of the disordered area. The modification of Cys-47 sterically hinders structural organization of this region, and although it does not prevent glutathione binding, it significantly reduces the affinity. A detailed kinetic study of the modified enzyme indicates that the carboxymethylation increases the Km for glutathione by 3 orders of magnitude, although the enzyme can function efficiently under saturating conditions.
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(as it appears on PubMed at http://www.pubmed.gov), where 9446594 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9446594}}
==About this Structure==
==About this Structure==
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[[Category: Glutathione]]
[[Category: Glutathione]]
[[Category: Transferase]]
[[Category: Transferase]]
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Revision as of 03:03, 1 July 2008

Image:1gti.png

Template:STRUCTURE 1gti

MODIFIED GLUTATHIONE S-TRANSFERASE (PI) COMPLEXED WITH S (P-NITROBENZYL)GLUTATHIONE

Template:ABSTRACT PUBMED 9446594

About this Structure

1GTI is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

The three-dimensional structure of Cys-47-modified mouse liver glutathione S-transferase P1-1. Carboxymethylation dramatically decreases the affinity for glutathione and is associated with a loss of electron density in the alphaB-310B region., Vega MC, Walsh SB, Mantle TJ, Coll M, J Biol Chem. 1998 Jan 30;273(5):2844-50. PMID:9446594

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