2yz7
From Proteopedia
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'''X-ray analyses of 3-hydroxybutyrate dehydrogenase from Alcaligenes faecalis''' | '''X-ray analyses of 3-hydroxybutyrate dehydrogenase from Alcaligenes faecalis''' | ||
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| + | ==Overview== | ||
| + | D-3-Hydroxybutyrate dehydrogenase, which catalyzes the reversible reaction between D-3-hydroxybutyrate and acetoacetate, has been classified into the short-chain dehydrogenase/reductase family and is a useful marker in the assay of diabetes mellitus and/or ketoacidosis. The enzyme from Alcaligenes faecalis was crystallized in the apo form and in the holo form with acetate as a substrate analogue. The crystal structures of both forms were determined at 2.2 angstroms resolution. The enzyme is a tetramer composed of four subunits assembled with noncrystallographic 222 point symmetry. Each subunit has two domains. The principal domain adopts the Rossmann fold essential for nucleotide binding, which is a common feature of the SDR family. NAD+ is bound in a large cleft in the domain. The pyrophosphate group of NAD+ is covered by the small additional domain, which is supported by two extended arms allowing domain movement. In the catalytic site, a water molecule is trapped by the catalytic Tyr155 and Ser142 residues in the vicinity of the bound NAD+ and acetate. The substrate analogue acetate is bound above the nicotinamide plane. A substrate (D-3-hydroxybutylate) bound model can reasonably be constructed by adding two C atoms into the void space between the water O atom and the methyl group of the acetate, suggesting a substrate-bound state before enzymatic reaction occurs. Based on these structural features, a reaction mechanism has been proposed. | ||
==About this Structure== | ==About this Structure== | ||
2YZ7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YZ7 OCA]. | 2YZ7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YZ7 OCA]. | ||
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| + | ==Reference== | ||
| + | The structures of Alcaligenes faecalis D-3-hydroxybutyrate dehydrogenase before and after NAD+ and acetate binding suggest a dynamical reaction mechanism as a member of the SDR family., Hoque MM, Shimizu S, Hossain MT, Yamamoto T, Imamura S, Suzuki K, Tsunoda M, Amano H, Sekiguchi T, Takenaka A, Acta Crystallogr D Biol Crystallogr. 2008 May;64(Pt 5):496-505. Epub 2008, Apr 19. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/18453685 18453685] | ||
[[Category: 3-hydroxybutyrate dehydrogenase]] | [[Category: 3-hydroxybutyrate dehydrogenase]] | ||
[[Category: Alcaligenes faecalis]] | [[Category: Alcaligenes faecalis]] | ||
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[[Category: Takenaka, A.]] | [[Category: Takenaka, A.]] | ||
[[Category: Oxidoreductase]] | [[Category: Oxidoreductase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jun 4 09:59:59 2008'' |
Revision as of 07:00, 4 June 2008
X-ray analyses of 3-hydroxybutyrate dehydrogenase from Alcaligenes faecalis
Overview
D-3-Hydroxybutyrate dehydrogenase, which catalyzes the reversible reaction between D-3-hydroxybutyrate and acetoacetate, has been classified into the short-chain dehydrogenase/reductase family and is a useful marker in the assay of diabetes mellitus and/or ketoacidosis. The enzyme from Alcaligenes faecalis was crystallized in the apo form and in the holo form with acetate as a substrate analogue. The crystal structures of both forms were determined at 2.2 angstroms resolution. The enzyme is a tetramer composed of four subunits assembled with noncrystallographic 222 point symmetry. Each subunit has two domains. The principal domain adopts the Rossmann fold essential for nucleotide binding, which is a common feature of the SDR family. NAD+ is bound in a large cleft in the domain. The pyrophosphate group of NAD+ is covered by the small additional domain, which is supported by two extended arms allowing domain movement. In the catalytic site, a water molecule is trapped by the catalytic Tyr155 and Ser142 residues in the vicinity of the bound NAD+ and acetate. The substrate analogue acetate is bound above the nicotinamide plane. A substrate (D-3-hydroxybutylate) bound model can reasonably be constructed by adding two C atoms into the void space between the water O atom and the methyl group of the acetate, suggesting a substrate-bound state before enzymatic reaction occurs. Based on these structural features, a reaction mechanism has been proposed.
About this Structure
2YZ7 is a Single protein structure of sequence from Alcaligenes faecalis. Full crystallographic information is available from OCA.
Reference
The structures of Alcaligenes faecalis D-3-hydroxybutyrate dehydrogenase before and after NAD+ and acetate binding suggest a dynamical reaction mechanism as a member of the SDR family., Hoque MM, Shimizu S, Hossain MT, Yamamoto T, Imamura S, Suzuki K, Tsunoda M, Amano H, Sekiguchi T, Takenaka A, Acta Crystallogr D Biol Crystallogr. 2008 May;64(Pt 5):496-505. Epub 2008, Apr 19. PMID:18453685 Page seeded by OCA on Wed Jun 4 09:59:59 2008
