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| - | [[Image:1orr.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1orr| PDB=1orr | SCENE= }} | | {{STRUCTURE_1orr| PDB=1orr | SCENE= }} |
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| - | '''Crystal Structure of CDP-Tyvelose 2-Epimerase complexed with NAD and CDP'''
| + | ===Crystal Structure of CDP-Tyvelose 2-Epimerase complexed with NAD and CDP=== |
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| - | ==Overview==
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| - | Tyvelose epimerase catalyzes the last step in the biosynthesis of tyvelose by converting CDP-d-paratose to CDP-d-tyvelose. This unusual 3,6-dideoxyhexose occurs in the O-antigens of some types of Gram-negative bacteria. Here we describe the cloning, protein purification, and high-resolution x-ray crystallographic analysis of tyvelose epimerase from Salmonella typhi complexed with CDP. The enzyme from S. typhi is a homotetramer with each subunit containing 339 amino acid residues and a tightly bound NAD+ cofactor. The quaternary structure of the enzyme displays 222 symmetry and can be aptly described as a dimer of dimers. Each subunit folds into two distinct lobes: the N-terminal motif responsible for NAD+ binding and the C-terminal region that harbors the binding site for CDP. The analysis described here demonstrates that tyvelose epimerase belongs to the short-chain dehydrogenase/reductase superfamily of enzymes. Indeed, its active site is reminiscent to that observed for UDP-galactose 4-epimerase, an enzyme that plays a key role in galactose metabolism. Unlike UDP-galactose 4-epimerase where the conversion of configuration occurs about C-4 of the UDP-glucose or UDP-galactose substrates, in the reaction catalyzed by tyvelose epimerase, the inversion of stereochemistry occurs at C-2. On the basis of the observed binding mode for CDP, it is possible to predict the manner in which the substrate, CDP-paratose, and the product, CDP-tyvelose, might be accommodated within the active site of tyvelose epimerase.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_12642575}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 12642575 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_12642575}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Rossmann fold]] | | [[Category: Rossmann fold]] |
| | [[Category: Short-chain dehydrogenase/reductase]] | | [[Category: Short-chain dehydrogenase/reductase]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 04:12:13 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 18:36:58 2008'' |
Revision as of 15:36, 28 July 2008
Template:STRUCTURE 1orr
Crystal Structure of CDP-Tyvelose 2-Epimerase complexed with NAD and CDP
Template:ABSTRACT PUBMED 12642575
About this Structure
1ORR is a Single protein structure of sequence from Salmonella typhi. Full crystallographic information is available from OCA.
Reference
High resolution x-ray structure of tyvelose epimerase from Salmonella typhi., Koropatkin NM, Liu HW, Holden HM, J Biol Chem. 2003 Jun 6;278(23):20874-81. Epub 2003 Mar 17. PMID:12642575
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