1iat
From Proteopedia
(New page: 200px<br /> <applet load="1iat" size="450" color="white" frame="true" align="right" spinBox="true" caption="1iat, resolution 1.62Å" /> '''CRYSTAL STRUCTURE O...) |
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| - | [[Image:1iat.gif|left|200px]]<br /> | + | [[Image:1iat.gif|left|200px]]<br /><applet load="1iat" size="350" color="white" frame="true" align="right" spinBox="true" |
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caption="1iat, resolution 1.62Å" /> | caption="1iat, resolution 1.62Å" /> | ||
'''CRYSTAL STRUCTURE OF HUMAN PHOSPHOGLUCOSE ISOMERASE/NEUROLEUKIN/AUTOCRINE MOTILITY FACTOR/MATURATION FACTOR'''<br /> | '''CRYSTAL STRUCTURE OF HUMAN PHOSPHOGLUCOSE ISOMERASE/NEUROLEUKIN/AUTOCRINE MOTILITY FACTOR/MATURATION FACTOR'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Phosphoglucose isomerase (PGI) is a multifunctional protein, which, inside | + | Phosphoglucose isomerase (PGI) is a multifunctional protein, which, inside the cell, functions as a housekeeping enzyme of glycolysis and gluconeogenesis and, outside the cell, exerts wholly unrelated cytokine properties. We have determined the structure of human PGI to a resolution of 1.6 A using X-ray crystallography. The structure is highly similar to other PGIs, especially the architecture of the active site. Fortuitous binding of a sulphate molecule from the crystallisation solution has facilitated an accurate description of the substrate phosphate-binding site. Comparison with both native and inhibitor-bound rabbit PGI structures shows that two loops move closer to the active site upon binding inhibitor. Interestingly, the human structure most closely resembles the inhibitor-bound structure, suggesting that binding of the phosphate moiety of the substrate may trigger this conformational change. We suggest a new mechanism for catalysis that uses Glu357 as the base catalyst for the isomerase reaction rather than His388 as proposed previously. The human PGI structure has also provided a detailed framework with which to map mutations associated with non-spherocytic haemolytic anaemia. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1IAT is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with SO4 and BME as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glucose-6-phosphate_isomerase Glucose-6-phosphate isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.3.1.9 5.3.1.9] Full crystallographic information is available from [http:// | + | 1IAT is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=BME:'>BME</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glucose-6-phosphate_isomerase Glucose-6-phosphate isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.3.1.9 5.3.1.9] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IAT OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Muirhead, H.]] | [[Category: Muirhead, H.]] | ||
[[Category: Pearce, J.]] | [[Category: Pearce, J.]] | ||
| - | [[Category: Read, J | + | [[Category: Read, J A.]] |
[[Category: BME]] | [[Category: BME]] | ||
[[Category: SO4]] | [[Category: SO4]] | ||
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[[Category: two alpha/beta domains]] | [[Category: two alpha/beta domains]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:09:49 2008'' |
Revision as of 11:09, 21 February 2008
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CRYSTAL STRUCTURE OF HUMAN PHOSPHOGLUCOSE ISOMERASE/NEUROLEUKIN/AUTOCRINE MOTILITY FACTOR/MATURATION FACTOR
Contents |
Overview
Phosphoglucose isomerase (PGI) is a multifunctional protein, which, inside the cell, functions as a housekeeping enzyme of glycolysis and gluconeogenesis and, outside the cell, exerts wholly unrelated cytokine properties. We have determined the structure of human PGI to a resolution of 1.6 A using X-ray crystallography. The structure is highly similar to other PGIs, especially the architecture of the active site. Fortuitous binding of a sulphate molecule from the crystallisation solution has facilitated an accurate description of the substrate phosphate-binding site. Comparison with both native and inhibitor-bound rabbit PGI structures shows that two loops move closer to the active site upon binding inhibitor. Interestingly, the human structure most closely resembles the inhibitor-bound structure, suggesting that binding of the phosphate moiety of the substrate may trigger this conformational change. We suggest a new mechanism for catalysis that uses Glu357 as the base catalyst for the isomerase reaction rather than His388 as proposed previously. The human PGI structure has also provided a detailed framework with which to map mutations associated with non-spherocytic haemolytic anaemia.
Disease
Known diseases associated with this structure: Hemolytic anemia due to glucosephosphate isomerase deficiency OMIM:[172400], Hydrops fetalis, one form OMIM:[172400]
About this Structure
1IAT is a Single protein structure of sequence from Homo sapiens with and as ligands. Active as Glucose-6-phosphate isomerase, with EC number 5.3.1.9 Full crystallographic information is available from OCA.
Reference
The crystal structure of human phosphoglucose isomerase at 1.6 A resolution: implications for catalytic mechanism, cytokine activity and haemolytic anaemia., Read J, Pearce J, Li X, Muirhead H, Chirgwin J, Davies C, J Mol Biol. 2001 Jun 1;309(2):447-63. PMID:11371164
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