View source for 5xbl


==Structure of nuclease in complex with associated protein==
<StructureSection load='5xbl' size='340' side='right'caption='[[5xbl]], [[Resolution|resolution]] 3.05&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5xbl]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Listeria_monocytogenes Listeria monocytogenes], [https://en.wikipedia.org/wiki/Streptococcus_pyogenes Streptococcus pyogenes] and [https://en.wikipedia.org/wiki/Streptococcus_pyogenes_serotype_M1 Streptococcus pyogenes serotype M1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XBL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5XBL 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]] 3.052&#8491;</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=5xbl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5xbl OCA], [https://pdbe.org/5xbl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5xbl RCSB], [https://www.ebi.ac.uk/pdbsum/5xbl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5xbl ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CAS9_STRP1 CAS9_STRP1] 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) (Probable). 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. The target strand not complementary to crRNA is first cut endonucleolytically, then trimmed by 3'-5' exonucleolytically. DNA-binding requires protein and both RNA species. Cas9 probably recognizes a short motif in the CRISPR repeat sequences (the PAM or protospacer adjacent motif) to help distinguish self versus nonself.<ref>PMID:21455174</ref> <ref>PMID:22745249</ref> 

==See Also==
*[[Endonuclease 3D structures|Endonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Listeria monocytogenes]]
[[Category: Streptococcus pyogenes]]
[[Category: Streptococcus pyogenes serotype M1]]
[[Category: Dong D]]
[[Category: Guo M]]
[[Category: Huang Z]]
[[Category: Wang S]]
[[Category: Zhu Y]]