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1tsy

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[[Image:1tsy.jpg|left|200px]]
 
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==THYMIDYLATE SYNTHASE R179K MUTANT==
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The line below this paragraph, containing "STRUCTURE_1tsy", creates the "Structure Box" on the page.
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<StructureSection load='1tsy' size='340' side='right'caption='[[1tsy]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1tsy]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Lacticaseibacillus_casei Lacticaseibacillus casei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TSY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1TSY FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=UMP:2-DEOXYURIDINE+5-MONOPHOSPHATE'>UMP</scene></td></tr>
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{{STRUCTURE_1tsy| PDB=1tsy | SCENE= }}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1tsy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tsy OCA], [https://pdbe.org/1tsy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1tsy RCSB], [https://www.ebi.ac.uk/pdbsum/1tsy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1tsy ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TYSY_LACCA TYSY_LACCA] Provides the sole de novo source of dTMP for DNA biosynthesis.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ts/1tsy_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1tsy ConSurf].
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<div style="clear:both"></div>
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'''THYMIDYLATE SYNTHASE R179K MUTANT'''
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==See Also==
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*[[Thymidylate synthase 3D structures|Thymidylate synthase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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Invariant arginine 179, one of four arginines that are conserved in all thymidylate synthases (TS) and that bind the phosphate moiety of the substrate 2'-deoxyuridine-5'-monophosphate (dUMP), can be altered even to a negatively charged glutamic acid with little effect on kcat. In the mutant structures, ordered water or the other phosphate-binding arginines compensate for the hydrogen bonds made by Arg179 in the wild-type enzyme and there is almost no change in the conformation or binding site of dUMP. Correlation of dUMP Kds for TS R179A and TS R179K with the structures of their binary complexes shows, that the positive charge on Arg179 contributes significantly to dUMP binding affinity. kcat/K(m) for dUMP measures the rate of dUMP binding to TS during the ordered bi-substrate reaction, and in the ternary complex dUMP provides a binding surface for the cofactor. kcat/K(m) reflects the ability of the enzyme to accept a properly oriented dUMP for catalysis and is less sensitive than is Kd to the changes in electrostatics at the phosphate binding site.
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[[Category: Lacticaseibacillus casei]]
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[[Category: Large Structures]]
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==About this Structure==
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[[Category: Finer-Moore J]]
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1TSY is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Lactobacillus_casei Lactobacillus casei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TSY OCA].
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[[Category: Stroud RM]]
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==Reference==
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Contribution of a salt bridge to binding affinity and dUMP orientation to catalytic rate: mutation of a substrate-binding arginine in thymidylate synthase., Finer-Moore JS, Fauman EB, Morse RJ, Santi DV, Stroud RM, Protein Eng. 1996 Jan;9(1):69-75. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9053905 9053905]
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[[Category: Lactobacillus casei]]
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[[Category: Single protein]]
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[[Category: Thymidylate synthase]]
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[[Category: Finer-Moore, J.]]
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[[Category: Stroud, R M.]]
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[[Category: Methyltransferase]]
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[[Category: Nucleotide biosynthesis]]
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[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:19:30 2008''
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Current revision

THYMIDYLATE SYNTHASE R179K MUTANT

PDB ID 1tsy

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