1h5r: Difference between revisions
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== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1h5r]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H5R OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1H5R FirstGlance]. <br> | <table><tr><td colspan='2'>[[1h5r]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H5R OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1H5R FirstGlance]. <br> | ||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=G1P:ALPHA-D-GLUCOSE-1-PHOSPHATE'>G1P</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=THM:THYMIDINE'>THM</scene>< | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=G1P:ALPHA-D-GLUCOSE-1-PHOSPHATE'>G1P</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=THM:THYMIDINE'>THM</scene></td></tr> | ||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1h5s|1h5s]], [[1h5t|1h5t]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1h5s|1h5s]], [[1h5t|1h5t]]</td></tr> | ||
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[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] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[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] </span></td></tr> | ||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1h5r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h5r OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1h5r RCSB], [http://www.ebi.ac.uk/pdbsum/1h5r PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1h5r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h5r OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1h5r RCSB], [http://www.ebi.ac.uk/pdbsum/1h5r PDBsum]</span></td></tr> | ||
<table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Glucose-1-phosphate thymidylyltransferase]] | [[Category: Glucose-1-phosphate thymidylyltransferase]] | ||
[[Category: Bolognesi, M | [[Category: Bolognesi, M]] | ||
[[Category: Rosano, C | [[Category: Rosano, C]] | ||
[[Category: Zuccotti, S | [[Category: Zuccotti, S]] | ||
[[Category: Nucleotide sugar methabolism]] | [[Category: Nucleotide sugar methabolism]] | ||
[[Category: Pyrophosphatase]] | [[Category: Pyrophosphatase]] | ||
[[Category: Transferase]] | [[Category: Transferase]] | ||
Revision as of 23:12, 22 December 2014
THYMIDYLYLTRANSFERASE COMPLEXED WITH THIMIDINE AND GLUCOSE-1-PHOSPATETHYMIDYLYLTRANSFERASE COMPLEXED WITH THIMIDINE AND GLUCOSE-1-PHOSPATE
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedGlucose-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. 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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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