View source for 7d3j


==Crystal structure of the Cas12i1 R-loop complex after target DNA cleavage==
<StructureSection load='7d3j' size='340' side='right'caption='[[7d3j]], [[Resolution|resolution]] 2.45&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7d3j]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Lachnospiraceae_bacterium_ND2006 Lachnospiraceae bacterium ND2006]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7D3J OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7D3J 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]] 2.45&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</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=7d3j FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7d3j OCA], [https://pdbe.org/7d3j PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7d3j RCSB], [https://www.ebi.ac.uk/pdbsum/7d3j PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7d3j ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Cas12i is a newly identified member of the functionally diverse type V CRISPR-Cas effectors. Although Cas12i has the potential to serve as genome-editing tool, its structural and functional characteristics need to be investigated in more detail before effective application. Here we report the crystal structures of the Cas12i1 R-loop complexes before and after target DNA cleavage to elucidate the mechanisms underlying target DNA duplex unwinding, R-loop formation and cis cleavage. The structure of the R-loop complex after target DNA cleavage also provides information regarding trans cleavage. Besides, we report a crystal structure of the Cas12i1 binary complex interacting with a pseudo target oligonucleotide, which mimics target interrogation. Upon target DNA duplex binding, the Cas12i1 PAM-interacting cleft undergoes a remarkable open-to-closed adjustment. Notably, a zipper motif in the Helical-I domain facilitates unzipping of the target DNA duplex. Formation of the 19-bp crRNA-target DNA strand heteroduplex in the R-loop complexes triggers a conformational rearrangement and unleashes the DNase activity. This study provides valuable insights for developing Cas12i1 into a reliable genome-editing tool.

Mechanistic insights into the R-loop formation and cleavage in CRISPR-Cas12i1.,Zhang B, Luo D, Li Y, Perculija V, Chen J, Lin J, Ye Y, Ouyang S Nat Commun. 2021 Jun 9;12(1):3476. doi: 10.1038/s41467-021-23876-5. PMID:34108490<ref>PMID:34108490</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 7d3j" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Lachnospiraceae bacterium ND2006]]
[[Category: Large Structures]]
[[Category: Li Y]]
[[Category: Luo DY]]
[[Category: OuYang SY]]
[[Category: Zhang B]]