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1ydk

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{{STRUCTURE_1ydk| PDB=1ydk | SCENE= }}
{{STRUCTURE_1ydk| PDB=1ydk | SCENE= }}
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'''Crystal structure of the I219A mutant of human glutathione transferase A1-1 with S-hexylglutathione'''
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===Crystal structure of the I219A mutant of human glutathione transferase A1-1 with S-hexylglutathione===
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==Overview==
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The C-terminal region in class Alpha glutathione transferase A1-1 (GSTA1-1), which forms an amphipathic alpha-helix (helix 9), is known to contribute to the catalytic and non-substrate ligand-binding functions of the enzyme. The region in the apo protein is proposed to be disordered which, upon ligand binding at the active-site, becomes structured and localised. Because Ile219 plays a pivotal role in the stability and localisation of the region, the role of tertiary interactions mediated by Ile219 in determining the conformation and dynamics of the C-terminal region were studied. Ligand-binding microcalorimetric and X-ray structural data were obtained to characterise ligand binding at the active-site and the associated localisation of the C-terminal region. In the crystal structure of the I219A hGSTA1-1.S-hexylglutathione complex, the C-terminal region of one chain is mobile and not observed (unresolved electron density), whereas the corresponding region of the other chain is localised and structured as a result of crystal packing interactions. In solution, the mutant C-terminal region of both chains in the complex is mobile and delocalised resulting in a hydrated, less hydrophobic active-site and a reduction in the affinity of the protein for S-hexylglutathione. Complete dehydration of the active-site, important for maintaining the highly reactive thiolate form of glutathione, requires the binding of ligands and the subsequent localisation of the C-terminal region. Thermodynamic data demonstrate that the mobile C-terminal region in apo hGSTA1-1 is structured and does not undergo ligand-induced folding. Its close proximity to the surface of the wild-type protein is indicated by the concurrence between the observed heat capacity change of complex formation and the type and amount of surface area that becomes buried at the ligand-protein interface when the C-terminal region in the apo protein assumes the same localised structure as that observed in the wild-type complex.
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(as it appears on PubMed at http://www.pubmed.gov), where 15893769 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15893769}}
==About this Structure==
==About this Structure==
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[[Category: Glutathione transferase]]
[[Category: Glutathione transferase]]
[[Category: S-hexylglutathione]]
[[Category: S-hexylglutathione]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 16:11:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:35:06 2008''

Revision as of 09:35, 29 July 2008

Image:1ydk.png

Template:STRUCTURE 1ydk

Crystal structure of the I219A mutant of human glutathione transferase A1-1 with S-hexylglutathione

Template:ABSTRACT PUBMED 15893769

About this Structure

1YDK is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Tertiary interactions stabilise the C-terminal region of human glutathione transferase A1-1: a crystallographic and calorimetric study., Kuhnert DC, Sayed Y, Mosebi S, Sayed M, Sewell T, Dirr HW, J Mol Biol. 2005 Jun 17;349(4):825-38. PMID:15893769

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