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| | <StructureSection load='3tkb' size='340' side='right'caption='[[3tkb]], [[Resolution|resolution]] 1.50Å' scene=''> | | <StructureSection load='3tkb' size='340' side='right'caption='[[3tkb]], [[Resolution|resolution]] 1.50Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3tkb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TKB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3TKB FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3tkb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TKB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3TKB FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.5Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">UNG, DGU, UNG1, UNG15 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Uracil-DNA_glycosylase Uracil-DNA glycosylase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.27 3.2.2.27] </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=3tkb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tkb OCA], [https://pdbe.org/3tkb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3tkb RCSB], [https://www.ebi.ac.uk/pdbsum/3tkb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3tkb 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=3tkb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tkb OCA], [https://pdbe.org/3tkb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3tkb RCSB], [https://www.ebi.ac.uk/pdbsum/3tkb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3tkb ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Disease == | | == Disease == |
| - | [[https://www.uniprot.org/uniprot/UNG_HUMAN UNG_HUMAN]] Defects in UNG are a cause of immunodeficiency with hyper-IgM type 5 (HIGM5) [MIM:[https://omim.org/entry/608106 608106]]. A rare immunodeficiency syndrome characterized by normal or elevated serum IgM levels with absence of IgG, IgA, and IgE. It results in a profound susceptibility to bacterial infections.<ref>PMID:12958596</ref> <ref>PMID:15967827</ref>
| + | [https://www.uniprot.org/uniprot/UNG_HUMAN UNG_HUMAN] Defects in UNG are a cause of immunodeficiency with hyper-IgM type 5 (HIGM5) [MIM:[https://omim.org/entry/608106 608106]. A rare immunodeficiency syndrome characterized by normal or elevated serum IgM levels with absence of IgG, IgA, and IgE. It results in a profound susceptibility to bacterial infections.<ref>PMID:12958596</ref> <ref>PMID:15967827</ref> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/UNG_HUMAN UNG_HUMAN]] Excises uracil residues from the DNA which can arise as a result of misincorporation of dUMP residues by DNA polymerase or due to deamination of cytosine.
| + | [https://www.uniprot.org/uniprot/UNG_HUMAN UNG_HUMAN] Excises uracil residues from the DNA which can arise as a result of misincorporation of dUMP residues by DNA polymerase or due to deamination of cytosine. |
| - | <div style="background-color:#fffaf0;">
| + | |
| - | == Publication Abstract from PubMed ==
| + | |
| - | Uracil-DNA N-glycosylase (UNG; EC 3.2.2.27) from Atlantic cod (cUNG) possesses cold adapted features like increased catalytic efficiency and reduced temperature optimum for activity compared to its warm-adapted homologue human UNG (hUNG). Here, we present the first thermal stability analysis of cUNG and hUNG by differential scanning calorimetry (DSC), and the results showed that cUNG is less stable than hUNG and unfolds at a melting temperature (T(m)) 9 degrees lower than its warm-adapted homologue. In addition, an ion-pair (D183-K302) suggested to be crucial for global stability of hUNG was investigated by biochemical characterization and DSC of four mutants (cUNG G183D and cUNG G183D-R302K, hUNG D183G and hUNG D183G-K302R). The hUNG mutants with an expected disruption of the ion-pair showed a slight increase in stability with concomitant reduction in the enzyme activity, while the apparent introduction of the ion-pair in cUNG caused a reduction in the enzyme activity but no increase in stability. Because the mutants did not behave as expected, the phenomenon was further investigated by crystal structure determination. Indeed, the crystal structure of the hUNG D183G-K302R mutant revealed that compensating interactions for the loss of the ion-pair were generated close to and in regions distant from the mutation site. In conclusion, the reduced stability of cUNG supports the suggested requirement of a flexible structure for improved activity at low temperatures. Furthermore, the lack of a direct correlation between enzyme activity and global stability of the mutants supports the significance of distributing locally flexible and/or rigid regions for modulation of enzyme activity.
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| - | Thermal unfolding studies of cold adapted uracil-DNA N-glycosylase (UNG) from Atlantic cod (Gadus morhua). A comparative study with human UNG.,Assefa NG, Niiranen L, Willassen NP, Smalas A, Moe E Comp Biochem Physiol B Biochem Mol Biol. 2011 Sep 18. PMID:21959147<ref>PMID:21959147</ref>
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| - | | + | |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| - | </div>
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| - | <div class="pdbe-citations 3tkb" style="background-color:#fffaf0;"></div>
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| | | | |
| | ==See Also== | | ==See Also== |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Uracil-DNA glycosylase]]
| + | [[Category: Assefa NG]] |
| - | [[Category: Assefa, N G]] | + | [[Category: Moe E]] |
| - | [[Category: Moe, E]] | + | [[Category: Niiranen L]] |
| - | [[Category: Niiranen, L]] | + | [[Category: Smalas AO]] |
| - | [[Category: Smalas, A O]] | + | [[Category: Willassen NP]] |
| - | [[Category: Willassen, N P]] | + | |
| - | [[Category: Alpha/beta protein]]
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| - | [[Category: Glycosidase]]
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| - | [[Category: Hydrolase]]
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