View source for 3wpd


==Crystal structure of horse TLR9 in complex with inhibitory DNA4084==
<StructureSection load='3wpd' size='340' side='right'caption='[[3wpd]], [[Resolution|resolution]] 2.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3wpd]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3WPD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3WPD FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3wpb|3wpb]], [[3wpc|3wpc]], [[3wpe|3wpe]], [[3wpf|3wpf]], [[3wpg|3wpg]], [[3wph|3wph]], [[3wpi|3wpi]]</div></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TLR9 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9796 Equus caballus])</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=3wpd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3wpd OCA], [https://pdbe.org/3wpd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3wpd RCSB], [https://www.ebi.ac.uk/pdbsum/3wpd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3wpd ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Innate immunity serves as the first line of defence against invading pathogens such as bacteria and viruses. Toll-like receptors (TLRs) are examples of innate immune receptors, which sense specific molecular patterns from pathogens and activate immune responses. TLR9 recognizes bacterial and viral DNA containing the cytosine-phosphate-guanine (CpG) dideoxynucleotide motif. The molecular basis by which CpG-containing DNA (CpG-DNA) elicits immunostimulatory activity via TLR9 remains to be elucidated. Here we show the crystal structures of three forms of TLR9: unliganded, bound to agonistic CpG-DNA, and bound to inhibitory DNA (iDNA). Agonistic-CpG-DNA-bound TLR9 formed a symmetric TLR9-CpG-DNA complex with 2:2 stoichiometry, whereas iDNA-bound TLR9 was a monomer. CpG-DNA was recognized by both protomers in the dimer, in particular by the amino-terminal fragment (LRRNT-LRR10) from one protomer and the carboxy-terminal fragment (LRR20-LRR22) from the other. The iDNA, which formed a stem-loop structure suitable for binding by intramolecular base pairing, bound to the concave surface from LRR2-LRR10. This structure serves as an important basis for improving our understanding of the functional mechanisms of TLR9.

Structural basis of CpG and inhibitory DNA recognition by Toll-like receptor 9.,Ohto U, Shibata T, Tanji H, Ishida H, Krayukhina E, Uchiyama S, Miyake K, Shimizu T Nature. 2015 Apr 30;520(7549):702-5. doi: 10.1038/nature14138. Epub 2015 Feb 9. PMID:25686612<ref>PMID:25686612</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Toll-like Receptor 3D structures|Toll-like Receptor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Equus caballus]]
[[Category: Large Structures]]
[[Category: Ohto, U]]
[[Category: Shimizu, T]]
[[Category: Tanji, H]]
[[Category: Dna binding]]
[[Category: Dna binding protein-dna complex]]
[[Category: Glycosylation]]
[[Category: Innate immunity]]
[[Category: Leucine rich repeat]]
[[Category: Receptor]]