8d3l
From Proteopedia
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| - | '''Unreleased structure''' | ||
| - | + | ==Type I-C Cas4-Cas1-Cas2 complex bound to a PAM/PAM prespacer== | |
| + | <StructureSection load='8d3l' size='340' side='right'caption='[[8d3l]], [[Resolution|resolution]] 3.49Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[8d3l]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Alkalihalobacillus_halodurans_C-125 Alkalihalobacillus halodurans C-125] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8D3L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8D3L FirstGlance]. <br> | ||
| + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</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=8d3l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8d3l OCA], [https://pdbe.org/8d3l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8d3l RCSB], [https://www.ebi.ac.uk/pdbsum/8d3l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8d3l ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/Q9KFX9_HALH5 Q9KFX9_HALH5] CRISPR (clustered regularly interspaced short palindromic repeat), is an adaptive immune system that provides protection against mobile genetic elements (viruses, transposable elements and conjugative plasmids). CRISPR clusters contain spacers, sequences complementary to antecedent mobile elements, and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA). Acts as a dsDNA endonuclease. Involved in the integration of spacer DNA into the CRISPR cassette.[HAMAP-Rule:MF_01470] | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Adaptation in CRISPR-Cas systems immunizes bacteria and archaea against mobile genetic elements. In many DNA-targeting systems, the Cas4-Cas1-Cas2 complex is required for selection and processing of DNA segments containing PAM sequences prior to integration of these "prespacer" substrates as spacers in the CRISPR array. We determined cryo-EM structures of the Cas4-Cas1-Cas2 adaptation complex from the type I-C system that encodes standalone Cas1 and Cas4 proteins. The structures reveal how Cas4 specifically reads out bases within the PAM sequence and how interactions with both Cas1 and Cas2 activate Cas4 endonuclease activity. The Cas4-PAM interaction ensures tight binding between the adaptation complex and the prespacer, significantly enhancing integration of the non-PAM end into the CRISPR array and ensuring correct spacer orientation. Corroborated with our biochemical results, Cas4-Cas1-Cas2 structures with substrates representing various stages of CRISPR adaptation reveal a temporally resolved mechanism for maturation and integration of functional spacers into the CRISPR array. | ||
| - | + | PAM binding ensures orientational integration during Cas4-Cas1-Cas2-mediated CRISPR adaptation.,Dhingra Y, Suresh SK, Juneja P, Sashital DG Mol Cell. 2022 Oct 14. pii: S1097-2765(22)00951-0. doi:, 10.1016/j.molcel.2022.09.030. PMID:36272411<ref>PMID:36272411</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| + | <div class="pdbe-citations 8d3l" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Alkalihalobacillus halodurans C-125]] | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Synthetic construct]] | ||
| + | [[Category: Dhingra Y]] | ||
| + | [[Category: Juneja P]] | ||
| + | [[Category: Sashital DG]] | ||
| + | [[Category: Suresh SK]] | ||
Revision as of 07:24, 3 November 2022
Type I-C Cas4-Cas1-Cas2 complex bound to a PAM/PAM prespacer
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