View source for 9ehw


==FnCas9 16 mismatch DNA non-productive state==
<StructureSection load='9ehw' size='340' side='right'caption='[[9ehw]], [[Resolution|resolution]] 2.98&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9ehw]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Francisella_tularensis_subsp._novicida Francisella tularensis subsp. novicida] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9EHW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9EHW FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.98&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=9ehw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9ehw OCA], [https://pdbe.org/9ehw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9ehw RCSB], [https://www.ebi.ac.uk/pdbsum/9ehw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9ehw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CAS9_FRATN CAS9_FRATN] 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). In type II CRISPR systems correct processing of pre-crRNA requires a trans-encoded small RNA (tracrRNA), endogenous ribonuclease 3 (rnc) and this protein. The tracrRNA serves as a guide for ribonuclease 3-aided processing of pre-crRNA. Subsequently Cas9/crRNA/tracrRNA endonucleolytically cleaves linear or circular dsDNA target complementary to the spacer; Cas9 is inactive in the absence of the 2 guide RNAs (gRNA). Cas9 recognizes a short motif in the CRISPR repeat sequences (the PAM or protospacer adjacent motif) to help distinguish self versus nonself, as targets within the bacterial CRISPR locus do not have PAMs. PAM recognition is also required for catalytic activity (By similarity). Cuts target DNA when Cas9 and gRNAs are mixed.<ref>PMID:24270795</ref> 
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Francisella tularensis subsp. novicida]]
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Hibshman GN]]
[[Category: Taylor DW]]