3tdk

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{{Large structure}}
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==Crystal Structure of Human UDP-Glucose Dehydrogenase==
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{{STRUCTURE_3tdk| PDB=3tdk | SCENE= }}
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<StructureSection load='3tdk' size='340' side='right' caption='[[3tdk]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
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===Crystal Structure of Human UDP-Glucose Dehydrogenase===
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== Structural highlights ==
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{{ABSTRACT_PUBMED_21984906}}
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<table><tr><td colspan='2'>[[3tdk]] is a 12 chain structure with 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=3TDK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3TDK FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=UPG:URIDINE-5-DIPHOSPHATE-GLUCOSE'>UPG</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">UGDH ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/UDP-glucose_6-dehydrogenase UDP-glucose 6-dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.22 1.1.1.22] </span></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3tdk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tdk OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3tdk RCSB], [http://www.ebi.ac.uk/pdbsum/3tdk PDBsum]</span></td></tr>
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</table>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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BACKGROUND: UDP-glucose dehydrogenase (UGDH) is the sole enzyme that catalyzes the conversion of UDP-glucose to UDP-glucuronic acid. The product is used in xenobiotic glucuronidation in hepatocytes and in the production of proteoglycans that are involved in promoting normal cellular growth and migration. Overproduction of proteoglycans has been implicated in the progression of certain epithelial cancers, while inhibition of UGDH diminished tumor angiogenesis in vivo. A better understanding of the conformational changes occurring during the UGDH reaction cycle will pave the way for inhibitor design and potential cancer therapeutics. METHODOLOGY: Previously, the substrate-bound of UGDH was determined to be a symmetrical hexamer and this regular symmetry is disrupted on binding the inhibitor, UDP-alpha-D-xylose. Here, we have solved an alternate crystal structure of human UGDH (hUGDH) in complex with UDP-glucose at 2.8 A resolution. Surprisingly, the quaternary structure of this substrate-bound protein complex consists of the open homohexamer that was previously observed for inhibitor-bound hUGDH, indicating that this conformation is relevant for deciphering elements of the normal reaction cycle. CONCLUSION: In all subunits of the present open structure, Thr131 has translocated into the active site occupying the volume vacated by the absent active water and partially disordered NAD(+) molecule. This conformation suggests a mechanism by which the enzyme may exchange NADH for NAD(+) and repolarize the catalytic water bound to Asp280 while protecting the reaction intermediates. The structure also indicates how the subunits may communicate with each other through two reaction state sensors in this highly cooperative enzyme.
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==About this Structure==
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Structural Basis of Cooperativity in Human UDP-Glucose Dehydrogenase.,Rajakannan V, Lee HS, Chong SH, Ryu HB, Bae JY, Whang EY, Huh JW, Cho SW, Kang LW, Choe H, Robinson RC PLoS One. 2011;6(10):e25226. Epub 2011 Oct 3. PMID:21984906<ref>PMID:21984906</ref>
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[[3tdk]] is a 12 chain structure with 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=3TDK OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<ref group="xtra">PMID:021984906</ref><references group="xtra"/>
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</div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: UDP-glucose 6-dehydrogenase]]
[[Category: UDP-glucose 6-dehydrogenase]]
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[[Category: Han, C.]]
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[[Category: Han, C]]
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[[Category: Rajakannan, V.]]
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[[Category: Rajakannan, V]]
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[[Category: Robinson, R.]]
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[[Category: Robinson, R]]
[[Category: Nad]]
[[Category: Nad]]
[[Category: Open hexamer]]
[[Category: Open hexamer]]

Revision as of 08:36, 18 December 2014

Crystal Structure of Human UDP-Glucose Dehydrogenase

3tdk, resolution 2.80Å

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