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1hw3

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[[Image:1hw3.jpg|left|200px]]
 
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==STRUCTURE OF HUMAN THYMIDYLATE SYNTHASE SUGGESTS ADVANTAGES OF CHEMOTHERAPY WITH NONCOMPETITIVE INHIBITORS==
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The line below this paragraph, containing "STRUCTURE_1hw3", creates the "Structure Box" on the page.
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<StructureSection load='1hw3' size='340' side='right'caption='[[1hw3]], [[Resolution|resolution]] 2.00&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'>[[1hw3]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HW3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HW3 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&#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=CME:S,S-(2-HYDROXYETHYL)THIOCYSTEINE'>CME</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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{{STRUCTURE_1hw3| PDB=1hw3 | 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=1hw3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hw3 OCA], [https://pdbe.org/1hw3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hw3 RCSB], [https://www.ebi.ac.uk/pdbsum/1hw3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hw3 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TYSY_HUMAN TYSY_HUMAN] Contributes to the de novo mitochondrial thymidylate biosynthesis pathway.<ref>PMID:21876188</ref>
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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/hw/1hw3_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=1hw3 ConSurf].
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<div style="clear:both"></div>
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'''STRUCTURE OF HUMAN THYMIDYLATE SYNTHASE SUGGESTS ADVANTAGES OF CHEMOTHERAPY WITH NONCOMPETITIVE INHIBITORS'''
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==See Also==
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*[[Thymidylate synthase 3D structures|Thymidylate synthase 3D structures]]
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== References ==
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==Overview==
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<references/>
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Thymidylate synthase (TS) is a major target in the chemotherapy of colorectal cancer and some other neoplasms. The emergence of resistance to the treatment is often related to the increased levels of TS in cancer cells, which have been linked to the elimination of TS binding to its own mRNA upon drug binding, a feedback regulatory mechanism, and/or to the increased stability to intracellular degradation of TS.drug complexes (versus unliganded TS). The active site loop of human TS (hTS) has a unique conformation resulted from a rotation by 180 degrees relative to its orientation in bacterial TSs. In this conformation, the enzyme must be inactive, because the catalytic cysteine is no longer positioned in the ligand-binding pocket. The ordered solvent structure obtained from high resolution crystallographic data (2.0 A) suggests that the inactive loop conformation promotes mRNA binding and intracellular degradation of the enzyme. This hypothesis is supported by fluorescence studies, which indicate that in solution both active and inactive forms of hTS are present. The binding of phosphate ion shifts the equilibrium toward the inactive conformation; subsequent dUMP binding reverses the equilibrium toward the active form. Thus, TS inhibition via stabilization of the inactive conformation should lead to less resistance than is observed with presently used drugs, which are analogs of its substrates, dUMP and CH(2)H(4)folate, and bind in the active site, promoting the active conformation. The presence of an extension at the N terminus of native hTS has no significant effect on kinetic properties or crystal structure.
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__TOC__
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</StructureSection>
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==About this Structure==
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1HW3 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HW3 OCA].
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==Reference==
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Structure of human thymidylate synthase suggests advantages of chemotherapy with noncompetitive inhibitors., Phan J, Steadman DJ, Koli S, Ding WC, Minor W, Dunlap RB, Berger SH, Lebioda L, J Biol Chem. 2001 Apr 27;276(17):14170-7. Epub 2001 Jan 24. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11278511 11278511]
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[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Thymidylate synthase]]
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[[Category: Berger SH]]
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[[Category: Berger, S H.]]
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[[Category: Ding WC]]
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[[Category: Ding, W C.]]
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[[Category: Dunlap RB]]
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[[Category: Dunlap, R B.]]
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[[Category: Koli S]]
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[[Category: Koli, S.]]
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[[Category: Lebioda L]]
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[[Category: Lebioda, L.]]
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[[Category: Minor W]]
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[[Category: Minor, W.]]
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[[Category: Phan J]]
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[[Category: Phan, J.]]
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[[Category: Steadman JD]]
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[[Category: Steadman, J D.]]
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[[Category: Methyltransferase]]
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[[Category: Thymidylate synthase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:17:23 2008''
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Current revision

STRUCTURE OF HUMAN THYMIDYLATE SYNTHASE SUGGESTS ADVANTAGES OF CHEMOTHERAPY WITH NONCOMPETITIVE INHIBITORS

PDB ID 1hw3

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