View source for 6qxt


==Cas1-Cas2-Csn2-DNA dimer complex from the Type II-A CRISPR-Cas system==
<SX load='6qxt' size='340' side='right' viewer='molstar' caption='[[6qxt]], [[Resolution|resolution]] 8.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6qxt]] is a 54 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_19258 Atcc 19258] and [http://en.wikipedia.org/wiki/Escherichia_coli_bl21(de3) Escherichia coli bl21(de3)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6QXT OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6QXT FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6qxf|6qxf]], [[6qy3|6qy3]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">csn2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1308 ATCC 19258]), cas1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1308 ATCC 19258]), cas2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1308 ATCC 19258])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6qxt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6qxt OCA], [http://pdbe.org/6qxt PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6qxt RCSB], [http://www.ebi.ac.uk/pdbsum/6qxt PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6qxt ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
CRISPR and associated Cas proteins function as an adaptive immune system in prokaryotes to combat bacteriophage infection. During the immunization step, new spacers are acquired by the CRISPR machinery, but the molecular mechanism of spacer capture remains enigmatic. We show that the Cas9, Cas1, Cas2, and Csn2 proteins of a Streptococcus thermophilus type II-A CRISPR-Cas system form a complex and provide cryoelectron microscopy (cryo-EM) structures of three different assemblies. The predominant form, with the stoichiometry Cas18-Cas24-Csn28, referred to as monomer, contains approximately 30 bp duplex DNA bound along a central channel. A minor species, termed a dimer, comprises two monomers that sandwich a further eight Cas1 and four Cas2 subunits and contains two DNA approximately 30-bp duplexes within the channel. A filamentous form also comprises Cas18-Cas24-Csn28 units (typically 2-6) but with a different Cas1-Cas2 interface between them and a continuous DNA duplex running along a central channel.

Structure of the DNA-Bound Spacer Capture Complex of a Type II CRISPR-Cas System.,Wilkinson M, Drabavicius G, Silanskas A, Gasiunas G, Siksnys V, Wigley DB Mol Cell. 2019 May 6. pii: S1097-2765(19)30312-0. doi:, 10.1016/j.molcel.2019.04.020. PMID:31080012<ref>PMID:31080012</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 6qxt" style="background-color:#fffaf0;"></div>

==See Also==
*[[Endonuclease 3D structures|Endonuclease 3D structures]]
== References ==
<references/>
__TOC__
</SX>
[[Category: Atcc 19258]]
[[Category: Large Structures]]
[[Category: Drabavicius, G]]
[[Category: Gasiunas, G]]
[[Category: Siksnys, V]]
[[Category: Silanskas, A]]
[[Category: Wigley, D B]]
[[Category: Wilkinson, M]]
[[Category: Adaptation]]
[[Category: Antiviral]]
[[Category: Ca]]
[[Category: Calcium]]
[[Category: Crispr]]
[[Category: Dna binding]]
[[Category: Dna binding protein]]
[[Category: Metal-binding]]
[[Category: Nuclease]]
[[Category: Protein complex]]
[[Category: Protein-dna complex]]
[[Category: Spacer acquisition]]