2ime: Difference between revisions
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[[Image:2ime.jpg|left|200px]] | [[Image:2ime.jpg|left|200px]] | ||
'''2-Hydroxychromene-2-carboxylate Isomerase: a Kappa Class Glutathione-S-Transferase from Pseudomonas putida''' | {{Structure | ||
|PDB= 2ime |SIZE=350|CAPTION= <scene name='initialview01'>2ime</scene>, resolution 1.70Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=GSH:GLUTATHIONE'>GSH</scene>, <scene name='pdbligand=TOH:(3E)-4-(2-HYDROXYPHENYL)-2-OXOBUT-3-ENOIC+ACID'>TOH</scene>, <scene name='pdbligand=2C2:(2S)-2-HYDROXY-2H-CHROMENE-2-CARBOXYLIC+ACID'>2C2</scene> and <scene name='pdbligand=CXS:3-CYCLOHEXYL-1-PROPYLSULFONIC ACID'>CXS</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Glutathione_transferase Glutathione transferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.18 2.5.1.18] | |||
|GENE= nahD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=303 Pseudomonas putida]) | |||
}} | |||
'''2-Hydroxychromene-2-carboxylate Isomerase: a Kappa Class Glutathione-S-Transferase from Pseudomonas putida''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2IME is a [ | 2IME is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_putida Pseudomonas putida]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IME OCA]. | ||
==Reference== | ==Reference== | ||
2-Hydroxychromene-2-carboxylic acid isomerase: a kappa class glutathione transferase from Pseudomonas putida., Thompson LC, Ladner JE, Codreanu SG, Harp J, Gilliland GL, Armstrong RN, Biochemistry. 2007 Jun 12;46(23):6710-22. Epub 2007 May 18. PMID:[http:// | 2-Hydroxychromene-2-carboxylic acid isomerase: a kappa class glutathione transferase from Pseudomonas putida., Thompson LC, Ladner JE, Codreanu SG, Harp J, Gilliland GL, Armstrong RN, Biochemistry. 2007 Jun 12;46(23):6710-22. Epub 2007 May 18. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17508726 17508726] | ||
[[Category: Glutathione transferase]] | [[Category: Glutathione transferase]] | ||
[[Category: Pseudomonas putida]] | [[Category: Pseudomonas putida]] | ||
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[[Category: kgst]] | [[Category: kgst]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 17:31:07 2008'' | ||
Revision as of 18:31, 20 March 2008
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| , resolution 1.70Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , , and | ||||||
| Gene: | nahD (Pseudomonas putida) | ||||||
| Activity: | Glutathione transferase, with EC number 2.5.1.18 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
2-Hydroxychromene-2-carboxylate Isomerase: a Kappa Class Glutathione-S-Transferase from Pseudomonas putida
OverviewOverview
The enzyme 2-hydroxychromene-2-carboxylic acid (HCCA) isomerase catalyzes the glutathione (GSH)-dependent interconversion (Keq = 1.5) of HCCA and trans-o-hydroxybenzylidene pyruvic acid (tHBPA) in the naphthalene catabolic pathway of Pseudomonas putida. The dimeric protein binds one molecule of GSH very tightly (Kd approximately 5 nM) and a second molecule of GSH with much lower affinity (Kd approximately 2 to 11 microM). The enzyme is unstable in the absence of GSH. The turnover number in the forward direction (47 s(-1) at 25 degrees C) greatly exceeds off rates for GSH (koff approximately 10(-3) to 10(-2) s(-1) at 10 degrees C), suggesting that GSH acts as a tightly bound cofactor in the reaction. The crystal structure of the enzyme at 1.7 A resolution reveals that the isomerase is closely related to class kappa GSH transferases. Diffraction quality crystals could only be obtained in the presence of GSH and HCCA/tHBPA. Clear electron density is seen for GSH. Electron density for the organic substrates is located near the GSH and is best modeled to include both HCCA and tHBPA at occupancies of 0.5 for each. Although there is no electron density connecting the sulfur of GSH to the organic substrates, the sulfur is located very close (2.78 A) to C7 of HCCA. Taken together, the results suggest that the isomerization reaction involves a short-lived covalent adduct between the sulfur of GSH and C7 of the substrate.
About this StructureAbout this Structure
2IME is a Single protein structure of sequence from Pseudomonas putida. Full crystallographic information is available from OCA.
ReferenceReference
2-Hydroxychromene-2-carboxylic acid isomerase: a kappa class glutathione transferase from Pseudomonas putida., Thompson LC, Ladner JE, Codreanu SG, Harp J, Gilliland GL, Armstrong RN, Biochemistry. 2007 Jun 12;46(23):6710-22. Epub 2007 May 18. PMID:17508726
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