2gcg
From Proteopedia
(New page: 200px<br /> <applet load="2gcg" size="450" color="white" frame="true" align="right" spinBox="true" caption="2gcg, resolution 2.200Å" /> '''Ternary Crystal St...) |
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caption="2gcg, resolution 2.200Å" /> | caption="2gcg, resolution 2.200Å" /> | ||
'''Ternary Crystal Structure of Human Glyoxylate Reductase/Hydroxypyruvate Reductase'''<br /> | '''Ternary Crystal Structure of Human Glyoxylate Reductase/Hydroxypyruvate Reductase'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Human glyoxylate reductase/hydroxypyruvate reductase (GRHPR) is a | + | Human glyoxylate reductase/hydroxypyruvate reductase (GRHPR) is a D-2-hydroxy-acid dehydrogenase that plays a critical role in the removal of the metabolic by-product glyoxylate from within the liver. Deficiency of this enzyme is the underlying cause of primary hyperoxaluria type 2 (PH2) and leads to increased urinary oxalate levels, formation of kidney stones and renal failure. Here we describe the crystal structure of human GRHPR at 2.2 A resolution. There are four copies of GRHPR in the crystallographic asymmetric unit: in each homodimer, one subunit forms a ternary (enzyme+NADPH+reduced substrate) complex, and the other a binary (enzyme+NADPH) form. The spatial arrangement of the two enzyme domains is the same in binary and ternary forms. This first crystal structure of a true ternary complex of an enzyme from this family demonstrates the relationship of substrate and catalytic residues within the active site, confirming earlier proposals of the mode of substrate binding, stereospecificity and likely catalytic mechanism for these enzymes. GRHPR has an unusual substrate specificity, preferring glyoxylate and hydroxypyruvate, but not pyruvate. A tryptophan residue (Trp141) from the neighbouring subunit of the dimer is projected into the active site region and appears to contribute to the selectivity for hydroxypyruvate. This first crystal structure of a human GRHPR enzyme also explains the deleterious effects of naturally occurring missense mutations of this enzyme that lead to PH2. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2GCG 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, NDP and DGY as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glyoxylate_reductase_(NADP(+)) Glyoxylate reductase (NADP(+))], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.79 1.1.1.79] Full crystallographic information is available from [http:// | + | 2GCG 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>, <scene name='pdbligand=NDP:'>NDP</scene> and <scene name='pdbligand=DGY:'>DGY</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Glyoxylate_reductase_(NADP(+)) Glyoxylate reductase (NADP(+))], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.79 1.1.1.79] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GCG OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Booth, M | + | [[Category: Booth, M P.S.]] |
| - | [[Category: Brady, R | + | [[Category: Brady, R L.]] |
[[Category: Conners, R.]] | [[Category: Conners, R.]] | ||
[[Category: Rumsby, G.]] | [[Category: Rumsby, G.]] | ||
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[[Category: nad(p) rossmann fold]] | [[Category: nad(p) rossmann fold]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:30:21 2008'' |
Revision as of 15:30, 21 February 2008
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Ternary Crystal Structure of Human Glyoxylate Reductase/Hydroxypyruvate Reductase
Contents |
Overview
Human glyoxylate reductase/hydroxypyruvate reductase (GRHPR) is a D-2-hydroxy-acid dehydrogenase that plays a critical role in the removal of the metabolic by-product glyoxylate from within the liver. Deficiency of this enzyme is the underlying cause of primary hyperoxaluria type 2 (PH2) and leads to increased urinary oxalate levels, formation of kidney stones and renal failure. Here we describe the crystal structure of human GRHPR at 2.2 A resolution. There are four copies of GRHPR in the crystallographic asymmetric unit: in each homodimer, one subunit forms a ternary (enzyme+NADPH+reduced substrate) complex, and the other a binary (enzyme+NADPH) form. The spatial arrangement of the two enzyme domains is the same in binary and ternary forms. This first crystal structure of a true ternary complex of an enzyme from this family demonstrates the relationship of substrate and catalytic residues within the active site, confirming earlier proposals of the mode of substrate binding, stereospecificity and likely catalytic mechanism for these enzymes. GRHPR has an unusual substrate specificity, preferring glyoxylate and hydroxypyruvate, but not pyruvate. A tryptophan residue (Trp141) from the neighbouring subunit of the dimer is projected into the active site region and appears to contribute to the selectivity for hydroxypyruvate. This first crystal structure of a human GRHPR enzyme also explains the deleterious effects of naturally occurring missense mutations of this enzyme that lead to PH2.
Disease
Known diseases associated with this structure: Hyperoxaluria, primary, type II OMIM:[604296]
About this Structure
2GCG is a Single protein structure of sequence from Homo sapiens with , and as ligands. Active as Glyoxylate reductase (NADP(+)), with EC number 1.1.1.79 Full crystallographic information is available from OCA.
Reference
Structural basis of substrate specificity in human glyoxylate reductase/hydroxypyruvate reductase., Booth MP, Conners R, Rumsby G, Brady RL, J Mol Biol. 2006 Jun 30;360(1):178-89. Epub 2006 May 22. PMID:16756993
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