3k4a

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<StructureSection load='3k4a' size='340' side='right'caption='[[3k4a]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
<StructureSection load='3k4a' size='340' side='right'caption='[[3k4a]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[3k4a]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3K4A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3K4A FirstGlance]. <br>
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<table><tr><td colspan='2'>[[3k4a]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3K4A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3K4A FirstGlance]. <br>
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</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
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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]] 2.9&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3k46|3k46]], [[3k4d|3k4d]]</div></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=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">b1617, gurA, gusA, JW1609, uidA ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Beta-glucuronidase Beta-glucuronidase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.31 3.2.1.31] </span></td></tr>
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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=3k4a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3k4a OCA], [https://pdbe.org/3k4a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3k4a RCSB], [https://www.ebi.ac.uk/pdbsum/3k4a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3k4a ProSAT]</span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3k4a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3k4a OCA], [https://pdbe.org/3k4a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3k4a RCSB], [https://www.ebi.ac.uk/pdbsum/3k4a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3k4a ProSAT]</span></td></tr>
</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/BGLR_ECOLI BGLR_ECOLI]
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The dose-limiting side effect of the common colon cancer chemotherapeutic CPT-11 is severe diarrhea caused by symbiotic bacterial beta-glucuronidases that reactivate the drug in the gut. We sought to target these enzymes without killing the commensal bacteria essential for human health. Potent bacterial beta-glucuronidase inhibitors were identified by high-throughput screening and shown to have no effect on the orthologous mammalian enzyme. Crystal structures established that selectivity was based on a loop unique to bacterial beta-glucuronidases. Inhibitors were highly effective against the enzyme target in living aerobic and anaerobic bacteria, but did not kill the bacteria or harm mammalian cells. Finally, oral administration of an inhibitor protected mice from CPT-11-induced toxicity. Thus, drugs may be designed to inhibit undesirable enzyme activities in essential microbial symbiotes to enhance chemotherapeutic efficacy.
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Alleviating cancer drug toxicity by inhibiting a bacterial enzyme.,Wallace BD, Wang H, Lane KT, Scott JE, Orans J, Koo JS, Venkatesh M, Jobin C, Yeh LA, Mani S, Redinbo MR Science. 2010 Nov 5;330(6005):831-5. PMID:21051639<ref>PMID:21051639</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 3k4a" style="background-color:#fffaf0;"></div>
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==See Also==
==See Also==
*[[Glucuronisidase 3D structures|Glucuronisidase 3D structures]]
*[[Glucuronisidase 3D structures|Glucuronisidase 3D structures]]
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== References ==
 
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<references/>
 
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Beta-glucuronidase]]
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[[Category: Escherichia coli K-12]]
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[[Category: Ecoli]]
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[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Orans, J]]
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[[Category: Orans J]]
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[[Category: Redinbo, M R]]
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[[Category: Redinbo MR]]
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[[Category: Wallace, B D]]
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[[Category: Wallace BD]]
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[[Category: Alpha/beta barrel]]
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[[Category: Beta-sandwich domain]]
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[[Category: Glycosidase]]
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[[Category: Glycosyl hydrolase]]
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[[Category: Hydrolase]]
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[[Category: Sugar-binding domain]]
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Revision as of 08:44, 7 February 2024

Crystal structure of selenomethionine substituted E. coli beta-glucuronidase

PDB ID 3k4a

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