1f4f: Difference between revisions
New page: left|200px<br /><applet load="1f4f" size="450" color="white" frame="true" align="right" spinBox="true" caption="1f4f, resolution 2.0Å" /> '''CRYSTAL STRUCTURE OF ... |
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[[Image:1f4f.jpg|left|200px]]<br /><applet load="1f4f" size=" | [[Image:1f4f.jpg|left|200px]]<br /><applet load="1f4f" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1f4f, resolution 2.0Å" /> | caption="1f4f, resolution 2.0Å" /> | ||
'''CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COMPLEXED WITH SP-722'''<br /> | '''CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COMPLEXED WITH SP-722'''<br /> | ||
==Overview== | ==Overview== | ||
We report a strategy (called "tethering") to discover low molecular weight | 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. | ||
==About this Structure== | ==About this Structure== | ||
1F4F is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with SO4 and TP3 as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http:// | 1F4F is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=TP3:'>TP3</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F4F OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Thymidylate synthase]] | [[Category: Thymidylate synthase]] | ||
[[Category: Braisted, A | [[Category: Braisted, A C.]] | ||
[[Category: Erlanson, D | [[Category: Erlanson, D A.]] | ||
[[Category: Gordon, E.]] | [[Category: Gordon, E.]] | ||
[[Category: Randal, M.]] | [[Category: Randal, M.]] | ||
[[Category: Raphael, D | [[Category: Raphael, D R.]] | ||
[[Category: Stroud, R | [[Category: Stroud, R M.]] | ||
[[Category: Wells, J | [[Category: Wells, J A.]] | ||
[[Category: SO4]] | [[Category: SO4]] | ||
[[Category: TP3]] | [[Category: TP3]] | ||
[[Category: crystal structure of e. coli thymidylate synthase complexed with sp-722]] | [[Category: crystal structure of e. coli thymidylate synthase complexed with sp-722]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:34:43 2008'' | ||
Revision as of 13:34, 21 February 2008
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CRYSTAL STRUCTURE OF E. COLI THYMIDYLATE SYNTHASE COMPLEXED WITH SP-722
OverviewOverview
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.
About this StructureAbout this Structure
1F4F is a Single protein structure of sequence from Escherichia coli with and as ligands. Active as Thymidylate synthase, with EC number 2.1.1.45 Full crystallographic information is available from OCA.
ReferenceReference
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:10944209
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