1h5r
From Proteopedia
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| - | [[Image:1h5r.gif|left|200px]] | + | [[Image:1h5r.gif|left|200px]] |
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| - | '''THYMIDYLYLTRANSFERASE COMPLEXED WITH THIMIDINE AND GLUCOSE-1-PHOSPATE''' | + | {{Structure |
| + | |PDB= 1h5r |SIZE=350|CAPTION= <scene name='initialview01'>1h5r</scene>, resolution 1.9Å | ||
| + | |SITE= <scene name='pdbsite=THM:So4+Binding+Site+For+Chain+B'>THM</scene> | ||
| + | |LIGAND= <scene name='pdbligand=G1P:ALPHA-D-GLUCOSE-1-PHOSPHATE'>G1P</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> and <scene name='pdbligand=THM:THYMIDINE'>THM</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Glucose-1-phosphate_thymidylyltransferase Glucose-1-phosphate thymidylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.24 2.7.7.24] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''THYMIDYLYLTRANSFERASE COMPLEXED WITH THIMIDINE AND GLUCOSE-1-PHOSPATE''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1H5R is a [ | + | 1H5R is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H5R OCA]. |
==Reference== | ==Reference== | ||
| - | Kinetic and crystallographic analyses support a sequential-ordered bi bi catalytic mechanism for Escherichia coli glucose-1-phosphate thymidylyltransferase., Zuccotti S, Zanardi D, Rosano C, Sturla L, Tonetti M, Bolognesi M, J Mol Biol. 2001 Nov 2;313(4):831-43. PMID:[http:// | + | Kinetic and crystallographic analyses support a sequential-ordered bi bi catalytic mechanism for Escherichia coli glucose-1-phosphate thymidylyltransferase., Zuccotti S, Zanardi D, Rosano C, Sturla L, Tonetti M, Bolognesi M, J Mol Biol. 2001 Nov 2;313(4):831-43. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11697907 11697907] |
[[Category: Glucose-1-phosphate thymidylyltransferase]] | [[Category: Glucose-1-phosphate thymidylyltransferase]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:32:38 2008'' |
Revision as of 09:32, 20 March 2008
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| , resolution 1.9Å | |||||||
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| Sites: | |||||||
| Ligands: | , and | ||||||
| Activity: | Glucose-1-phosphate thymidylyltransferase, with EC number 2.7.7.24 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THYMIDYLYLTRANSFERASE COMPLEXED WITH THIMIDINE AND GLUCOSE-1-PHOSPATE
Overview
Glucose-1-phosphate thymidylyltransferase is the first enzyme in the biosynthesis of dTDP-l-rhamnose, the precursor of l-rhamnose, an essential component of surface antigens, such as the O-lipopolysaccharide, mediating virulence and adhesion to host tissues in many microorganisms. The enzyme catalyses the formation of dTDP-glucose, from dTTP and glucose 1-phosphate, as well as its pyrophosphorolysis. To shed more light on the catalytic properties of glucose-1-phosphate thymidylyltransferase from Escherichia coli, specifically distinguishing between ping pong and sequential ordered bi bi reaction mechanisms, the enzyme kinetic properties have been analysed in the presence of different substrates and inhibitors. Moreover, three different complexes of glucose-1-phosphate thymidylyltransferase (co-crystallized with dTDP, with dTMP and glucose-1-phosphate, with d-thymidine and glucose-1-phosphate) have been analysed by X-ray crystallography, in the 1.9-2.3 A resolution range (R-factors of 17.3-17.5 %). The homotetrameric enzyme shows strongly conserved substrate/inhibitor binding modes in a surface cavity next to the topological switch-point of a quasi-Rossmann fold. Inspection of the subunit tertiary structure reveals relationships to other enzymes involved in the biosynthesis of nucleotide-sugars, including distant proteins such as the molybdenum cofactor biosynthesis protein MobA. The precise location of the substrate relative to putative reactive residues in the catalytic center suggests that, in keeping with the results of the kinetic measurements, both catalysed reactions, i.e. dTDP-glucose biosynthesis and pyrophosphorolysis, follow a sequential ordered bi bi catalytic mechanism.
About this Structure
1H5R is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
Kinetic and crystallographic analyses support a sequential-ordered bi bi catalytic mechanism for Escherichia coli glucose-1-phosphate thymidylyltransferase., Zuccotti S, Zanardi D, Rosano C, Sturla L, Tonetti M, Bolognesi M, J Mol Biol. 2001 Nov 2;313(4):831-43. PMID:11697907
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