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1f4g

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[[Image:1f4g.jpg|left|200px]]
 
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{{Structure
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==CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COMPLEXED WITH SP-876==
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|PDB= 1f4g |SIZE=350|CAPTION= <scene name='initialview01'>1f4g</scene>, resolution 1.75&Aring;
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<StructureSection load='1f4g' size='340' side='right'caption='[[1f4g]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=CXM:N-CARBOXYMETHIONINE'>CXM</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MHO:S-OXYMETHIONINE'>MHO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TP4:N-[4-[[GLUTAMIC+ACID]-CARBONYL]-BENZENE-SULFONYL-D-PROLINYL]-3-AMINO-PROPANOIC+ACID'>TP4</scene>
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<table><tr><td colspan='2'>[[1f4g]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F4G OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1F4G FirstGlance]. <br>
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Thymidylate_synthase Thymidylate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.45 2.1.1.45] </span>
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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]] 1.75&#8491;</td></tr>
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|GENE=
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CXM:N-CARBOXYMETHIONINE'>CXM</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MHO:S-OXYMETHIONINE'>MHO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TP4:N-[4-[[GLUTAMIC+ACID]-CARBONYL]-BENZENE-SULFONYL-D-PROLINYL]-3-AMINO-PROPANOIC+ACID'>TP4</scene></td></tr>
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|DOMAIN=
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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=1f4g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f4g OCA], [https://pdbe.org/1f4g PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1f4g RCSB], [https://www.ebi.ac.uk/pdbsum/1f4g PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1f4g ProSAT]</span></td></tr>
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|RELATEDENTRY=[[1f4b|1F4B]], [[1f4c|1F4C]], [[1f4d|1F4D]], [[1f4e|1F4E]], [[1f4f|1F4F]]
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</table>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1f4g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f4g OCA], [http://www.ebi.ac.uk/pdbsum/1f4g PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1f4g RCSB]</span>
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== Function ==
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}}
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[https://www.uniprot.org/uniprot/TYSY_ECOLI TYSY_ECOLI] Provides the sole de novo source of dTMP for DNA biosynthesis. This protein also binds to its mRNA thus repressing its own translation.
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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/f4/1f4g_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=1f4g ConSurf].
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<div style="clear:both"></div>
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'''CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COMPLEXED WITH SP-876'''
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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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We report a strategy (called "tethering") to discover low molecular weight ligands ( approximately 250 Da) that bind weakly to targeted sites on proteins through an intermediary disulfide tether. A native or engineered cysteine in a protein is allowed to react reversibly with a small library of disulfide-containing molecules ( approximately 1,200 compounds) at concentrations typically used in drug screening (10 to 200 microM). The cysteine-captured ligands, which are readily identified by MS, are among the most stable complexes, even though in the absence of the covalent tether the ligands may bind very weakly. This method was applied to generate a potent inhibitor for thymidylate synthase, an essential enzyme in pyrimidine metabolism with therapeutic applications in cancer and infectious diseases. The affinity of the untethered ligand (K(i) approximately 1 mM) was improved 3,000-fold by synthesis of a small set of analogs with the aid of crystallographic structures of the tethered complex. Such site-directed ligand discovery allows one to nucleate drug design from a spatially targeted lead fragment.
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==About this Structure==
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1F4G is a [[Single protein]] structure of 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=1F4G OCA].
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==Reference==
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Site-directed ligand discovery., Erlanson DA, Braisted AC, Raphael DR, Randal M, Stroud RM, Gordon EM, Wells JA, Proc Natl Acad Sci U S A. 2000 Aug 15;97(17):9367-72. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10944209 10944209]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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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: Braisted AC]]
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[[Category: Braisted, A C.]]
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[[Category: Erlanson DA]]
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[[Category: Erlanson, D A.]]
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[[Category: Gordon E]]
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[[Category: Gordon, E.]]
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[[Category: Randal M]]
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[[Category: Randal, M.]]
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[[Category: Raphael DR]]
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[[Category: Raphael, D R.]]
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[[Category: Stroud RM]]
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[[Category: Stroud, R M.]]
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[[Category: Wells JA]]
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[[Category: Wells, J A.]]
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[[Category: crystal structure of e. coli thymidylate synthase complexed with sp-876]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:15:40 2008''
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Current revision

CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COMPLEXED WITH SP-876

PDB ID 1f4g

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