View source for 9u75


==5hmC specific restriction endonuclease Escherichia coli E. coli O157:H7 PD-T4-3==
<StructureSection load='9u75' size='340' side='right'caption='[[9u75]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9u75]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7 Escherichia coli O157:H7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9U75 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9U75 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]] 2.803&#8491;</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=9u75 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9u75 OCA], [https://pdbe.org/9u75 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9u75 RCSB], [https://www.ebi.ac.uk/pdbsum/9u75 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9u75 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A9Q7EI50_ECO57 A0A9Q7EI50_ECO57] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The evolutionary arms race between bacteria and phages drives the development of bacterial antiviral defense systems and phage counter-defense strategies. Restriction-modification (RM) systems protect bacteria by methylating 'self' DNA and cleaving unmodified phage DNA. Phages like T-even coliphages evade RM systems by substituting cytosine with 5-hydroxymethyl cytosine (5hmC) or 5-glucosylated hmC (5ghmC). Here, we characterize âa single-component antiviral defense system featuring a GIY-YIG endonuclease domain. Biochemical and structural analyses demonstrate that this defense system is a type IV modification-dependent restriction endonuclease that specifically degrades 5hmC- or 5ghmC-modified DNA, and we accordingly name it CMoRE (Cytosine Modification âRâestriction Endonuclease). The crystal structures reveal an N-terminal GIY-YIG nuclease domain and a C-terminal modification-sensing domain. Unique features, including a 'GIYxY-YIG' motif and an inhibitory negatively charged loop, distinguish CMoRE as an additional member of the GIY-YIG family. This system not only highlights the evolutionary interplay between phages and bacteria but also presents CMoRE as a potential tool for precise genomic detection of 5hmC in mammals, with implications for epigenetics research and disease diagnostics.

A bacterial defense system targeting modified cytosine of phage genomic DNA.,Liu R, Tang D, Niu M, Lei S, Zong Z, Chen Q, Yu Y Nat Commun. 2026 Jan 22. doi: 10.1038/s41467-026-68792-8. PMID:41571690<ref>PMID:41571690</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9u75" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Escherichia coli O157:H7]]
[[Category: Large Structures]]
[[Category: Liu R]]
[[Category: Yu Y]]