5xtv: Difference between revisions
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<StructureSection load='5xtv' size='340' side='right'caption='[[5xtv]], [[Resolution|resolution]] 0.93Å' scene=''> | <StructureSection load='5xtv' size='340' side='right'caption='[[5xtv]], [[Resolution|resolution]] 0.93Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5xtv]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XTV OCA]. For a <b>guided tour on the structure components</b> use [ | <table><tr><td colspan='2'>[[5xtv]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Scheffersomyces_stipitis_CBS_6054 Scheffersomyces stipitis CBS 6054]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XTV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5XTV FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=8EF:2-[(5S)-3-[(4-azanyl-2-methyl-pyrimidin-5-yl)methyl]-4-methylidene-1,3-thiazolidin-5-yl]ethyl+phosphono+hydrogen+phosphate'>8EF</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 0.931Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=8EF:2-[(5S)-3-[(4-azanyl-2-methyl-pyrimidin-5-yl)methyl]-4-methylidene-1,3-thiazolidin-5-yl]ethyl+phosphono+hydrogen+phosphate'>8EF</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5xtv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5xtv OCA], [https://pdbe.org/5xtv PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5xtv RCSB], [https://www.ebi.ac.uk/pdbsum/5xtv PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5xtv ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/TKT_PICST TKT_PICST] Catalyzes the transfer of a two-carbon ketol group from a ketose donor to an aldose acceptor, via a covalent intermediate with the cofactor thiamine pyrophosphate. | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
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==See Also== | ==See Also== | ||
*[[Transketolase|Transketolase]] | *[[Transketolase 3D structures|Transketolase 3D structures]] | ||
== References == | == References == | ||
<references/> | <references/> | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: | [[Category: Scheffersomyces stipitis CBS 6054]] | ||
[[Category: Hsu | [[Category: Hsu NS]] | ||
[[Category: Li | [[Category: Li TL]] | ||
[[Category: Wang | [[Category: Wang YL]] | ||
Latest revision as of 11:13, 22 November 2023
Crystal Structure of Transketolase in complex with TPP intermediate V from Pichia StipitisCrystal Structure of Transketolase in complex with TPP intermediate V from Pichia Stipitis
Structural highlights
FunctionTKT_PICST Catalyzes the transfer of a two-carbon ketol group from a ketose donor to an aldose acceptor, via a covalent intermediate with the cofactor thiamine pyrophosphate. Publication Abstract from PubMedIt is theoretically plausible that thiazolium mesomerizes to congeners other than carbene in a low effective dielectric binding site; especially given the energetics and uneven electronegativity of carbene groups. However, such a phenomenon has never been reported. Nine crystal structures of transketolase obtained from Pichia stipitis (TKps) are reported with subatomic resolution, where thiazolium displays an extraordinary ring-bending effect. The bent thiazolium congeners correlate with non-Kekule diradicals because there is no gain or loss of electrons. In conjunction with biophysical and biochemical analyses, it is concluded that ring bending is a result of tautomerization of thiazolium with its non- Kekule diradicals, exclusively in the binding site of TKps. The chemophysical properties of these thiazolium mesomers may account for the great variety of reactivities carried out by thiamine-diphosphate-containing (ThDP) enzymes. The stability of ThDP in living systems can be regulated by the levels of substrates, and hydration and dehydration, as well as diradical-mediated oxidative degradation. The Mesomeric Effect of Thiazolium on non-Kekule Diradicals in Pichia stipitis Transketolase.,Hsu NS, Wang YL, Lin KH, Chang CF, Lyu SY, Hsu LJ, Liu YC, Chang CY, Wu CJ, Li TL Angew Chem Int Ed Engl. 2018 Feb 12;57(7):1802-1807. doi: 10.1002/anie.201709799., Epub 2018 Jan 15. PMID:29243887[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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