1zgn
From Proteopedia
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'''Crystal Structure of the Glutathione Transferase Pi in Complex with Dinitrosyl-diglutathionyl Iron Complex''' | '''Crystal Structure of the Glutathione Transferase Pi in Complex with Dinitrosyl-diglutathionyl Iron Complex''' | ||
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[[Category: Parker, L J.]] | [[Category: Parker, L J.]] | ||
[[Category: Parker, M W.]] | [[Category: Parker, M W.]] | ||
| - | [[Category: | + | [[Category: Detoxification]] |
| - | [[Category: | + | [[Category: Nitric oxide transport]] |
| - | [[Category: | + | [[Category: Transferase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:36:05 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 14:36, 3 May 2008
Crystal Structure of the Glutathione Transferase Pi in Complex with Dinitrosyl-diglutathionyl Iron Complex
Overview
We have recently shown that dinitrosyl diglutathionyl iron complex, a possible in vivo nitric oxide (NO) donor, binds with extraordinary affinity to one of the active sites of human glutathione transferase (GST) P1-1 and triggers negative cooperativity in the neighboring subunit of the dimer. This strong interaction has also been observed in the human Mu, Alpha, and Theta GST classes, suggesting a common mechanism by which GSTs may act as intracellular NO carriers or scavengers. We present here the crystal structure of GST P1-1 in complex with the dinitrosyl diglutathionyl iron ligand at high resolution. In this complex the active site Tyr-7 coordinates to the iron atom through its phenolate group by displacing one of the GSH ligands. The crucial importance of this catalytic residue in binding the nitric oxide donor is demonstrated by site-directed mutagenesis of this residue with His, Cys, or Phe residues. The relative binding affinity for the complex is strongly reduced in all three mutants by about 3 orders of magnitude with respect to the wild type. Electron paramagnetic resonance spectroscopy studies on intact Escherichia coli cells expressing the recombinant GST P1-1 enzyme indicate that bacterial cells, in response to NO treatment, are able to form the dinitrosyl diglutathionyl iron complex using intracellular iron and GSH. We hypothesize the complex is stabilized in vivo through binding to GST P1-1.
About this Structure
1ZGN is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Nitrosylation of human glutathione transferase P1-1 with dinitrosyl diglutathionyl iron complex in vitro and in vivo., Cesareo E, Parker LJ, Pedersen JZ, Nuccetelli M, Mazzetti AP, Pastore A, Federici G, Caccuri AM, Ricci G, Adams JJ, Parker MW, Lo Bello M, J Biol Chem. 2005 Dec 23;280(51):42172-80. Epub 2005 Sep 29. PMID:16195232 Page seeded by OCA on Sat May 3 17:36:05 2008
