1ks9

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|SITE=
|SITE=
|LIGAND=
|LIGAND=
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|ACTIVITY= [http://en.wikipedia.org/wiki/2-dehydropantoate_2-reductase 2-dehydropantoate 2-reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.169 1.1.1.169]
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/2-dehydropantoate_2-reductase 2-dehydropantoate 2-reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.169 1.1.1.169] </span>
|GENE= panE (apbA) ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
|GENE= panE (apbA) ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
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|DOMAIN=
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ks9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ks9 OCA], [http://www.ebi.ac.uk/pdbsum/1ks9 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ks9 RCSB]</span>
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[[Category: rossman fold]]
[[Category: rossman fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:52:50 2008''

Revision as of 18:52, 30 March 2008

Image:1ks9.jpg


PDB ID 1ks9

Drag the structure with the mouse to rotate
, resolution 1.70Å
Gene: panE (apbA) (Escherichia coli)
Activity: 2-dehydropantoate 2-reductase, with EC number 1.1.1.169
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Ketopantoate Reductase from Escherichia coli


Overview

Ketopantoate reductase (KPR, EC 1.1.1.169) catalyzes the NADPH-dependent reduction of ketopantoate to pantoate on the pantothenate (vitamin B(5)) biosynthetic pathway. The Escherichia coli panE gene encoding KPR was cloned and expressed at high levels as the native and selenomethionine-substituted (SeMet) proteins. Both native and SeMet recombinant proteins were purified by three chromatographic steps, to yield pure proteins. The wild-type enzyme was found to have a K(M)(NADPH) of 20 microM, a K(M)(ketopantoate) of 60 microM, and a k(cat) of 40 s(-1). Regular prismatic KPR crystals were prepared using the hanging drop technique. They belonged to the tetragonal space group P4(2)2(1)2, with cell parameters: a = b = 103.7 A and c = 55.7 A, accommodating one enzyme molecule per asymmetric unit. The structure of KPR was determined by the multiwavelength anomalous dispersion method using the SeMet protein, for which data were collected to 2.3 A resolution. The native data were collected to 1.7 A resolution and used to refine the final structure. The secondary structure comprises 12 alpha-helices, three 3(10)-helices, and 11 beta-strands. The enzyme is monomeric and has two domains separated by a cleft. The N-terminal domain has an alphabeta-fold of the Rossmann type. The C-terminal domain (residues 170-291) is composed of eight alpha-helices. KPR is shown to be a member of the 6-phosphogluconate dehydrogenase C-terminal domain-like superfamily. A model for the ternary enzyme-NADPH-ketopantoate ternary complex provides a rationale for kinetic data reported for specific site-directed mutants.

About this Structure

1KS9 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystal structure of Escherichia coli ketopantoate reductase at 1.7 A resolution and insight into the enzyme mechanism., Matak-Vinkovic D, Vinkovic M, Saldanha SA, Ashurst JL, von Delft F, Inoue T, Miguel RN, Smith AG, Blundell TL, Abell C, Biochemistry. 2001 Dec 4;40(48):14493-500. PMID:11724562

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