View source for 9lnq


==The hUNG bound to DNA product embedding 4primer-OCH3-dU==
<StructureSection load='9lnq' size='340' side='right'caption='[[9lnq]], [[Resolution|resolution]] 1.74&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9lnq]] is a 3 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=9LNQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9LNQ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.74&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=KBC:[(2~{R},3~{S},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-2-methoxy-3-oxidanyl-oxolan-2-yl]methyl+dihydrogen+phosphate'>KBC</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></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=9lnq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9lnq OCA], [https://pdbe.org/9lnq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9lnq RCSB], [https://www.ebi.ac.uk/pdbsum/9lnq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9lnq ProSAT]</span></td></tr>
</table>
== 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> 
== 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.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Uridine (rU) and 2'-deoxyuridine (dU) are common DNA lesions. dU is repaired through a base excision repair (BER) pathway initiated by uracil DNA glycosylase (UDG), while rU is typically removed from DNA via ribonucleotide excision repair, mediated by RNase H2. In this study, we report that rU is also repaired through the UDG-mediated BER pathway. We found that UDG catalyzes the removal of uracil from rU embedded in DNA, but exhibits no activity toward rU in RNA. Biochemical and crystallographic analyses revealed that the 2'-OH group of rU is effectively accommodated by UDG and directly participates in catalyzing the hydrolysis of the N-glycosidic bond. The abasic site product generated upon removal of uracil from rU by UDG is further processed by downstream BER enzymes to restore undamaged DNA. Our findings suggest that UDG-initiated BER constitutes a previously unrecognized pathway for the repair of rU-specific ribonucleotides. Additionally, we developed a method for selectively quantifying rU content in DNA. Using this method, we determined that rU repair by UDG is not a major pathway in human cells. This discovery expands our understanding of the diverse biological functions of UDG, and inspires further investigation to determine the role of its rU-removal in cells.

Uridine Embedded within DNA is Repaired by Uracil DNA Glycosylase via a Mechanism Distinct from That of Ribonuclease H2.,Fan C, Zhan X, Guo F, Li Q, Lu K, Shan X, Zhou Y, Ren M, Greenberg MM, Liu Y, Zhou C J Am Chem Soc. 2025 Apr 2;147(13):11574-11583. doi: 10.1021/jacs.5c01436. Epub , 2025 Mar 25. PMID:40130361<ref>PMID:40130361</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9lnq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Fan C]]
[[Category: Liu Y]]
[[Category: Zhan X]]
[[Category: Zhou C]]