6mcb

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Current revision (14:42, 13 March 2024) (edit) (undo)
 
(4 intermediate revisions not shown.)
Line 1: Line 1:
==CryoEM structure of AcrIIA2 in complex with CRISPR-Cas9==
==CryoEM structure of AcrIIA2 in complex with CRISPR-Cas9==
-
<StructureSection load='6mcb' size='340' side='right' caption='[[6mcb]], [[Resolution|resolution]] 3.40&Aring;' scene=''>
+
<SX load='6mcb' size='340' side='right' viewer='molstar' caption='[[6mcb]], [[Resolution|resolution]] 3.40&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
-
<table><tr><td colspan='2'>[[6mcb]] is a 3 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MCB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6MCB FirstGlance]. <br>
+
<table><tr><td colspan='2'>[[6mcb]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Listeria_phage_LP-101 Listeria phage LP-101] and [https://en.wikipedia.org/wiki/Streptococcus_pyogenes_M1_GAS Streptococcus pyogenes M1 GAS]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MCB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6MCB FirstGlance]. <br>
-
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene></td></tr>
+
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.4&#8491;</td></tr>
-
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6mcb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6mcb OCA], [http://pdbe.org/6mcb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6mcb RCSB], [http://www.ebi.ac.uk/pdbsum/6mcb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6mcb ProSAT]</span></td></tr>
+
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</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=6mcb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6mcb OCA], [https://pdbe.org/6mcb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6mcb RCSB], [https://www.ebi.ac.uk/pdbsum/6mcb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6mcb ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
-
[[http://www.uniprot.org/uniprot/J7M7J1_STRP1 J7M7J1_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). 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 the protospacer adjacent motif (PAM) in the CRISPR repeat sequences 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.[HAMAP-Rule:MF_01480]
+
[https://www.uniprot.org/uniprot/J7M7J1_STRP1 J7M7J1_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). 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 the protospacer adjacent motif (PAM) in the CRISPR repeat sequences 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.[HAMAP-Rule:MF_01480]
-
<div style="background-color:#fffaf0;">
+
-
== Publication Abstract from PubMed ==
+
-
CRISPR-Cas immune systems utilize RNA-guided nucleases to protect bacteria from bacteriophage infection. Bacteriophages have in turn evolved inhibitory "anti-CRISPR" (Acr) proteins, including six inhibitors (AcrIIA1-AcrIIA6) that can block DNA cutting and genome editing by type II-A CRISPR-Cas9 enzymes. We show here that AcrIIA2 and its more potent homolog, AcrIIA2b, prevent Cas9 binding to DNA by occluding protein residues required for DNA binding. Cryo-EM-determined structures of AcrIIA2 or AcrIIA2b bound to S. pyogenes Cas9 reveal a mode of competitive inhibition of DNA binding that is distinct from other known Acrs. Differences in the temperature dependence of Cas9 inhibition by AcrIIA2 and AcrIIA2b arise from differences in both inhibitor structure and the local inhibitor-binding environment on Cas9. These findings expand the natural toolbox for regulating CRISPR-Cas9 genome editing temporally, spatially, and conditionally.
+
-
Temperature-Responsive Competitive Inhibition of CRISPR-Cas9.,Jiang F, Liu JJ, Osuna BA, Xu M, Berry JD, Rauch BJ, Nogales E, Bondy-Denomy J, Doudna JA Mol Cell. 2018 Dec 19. pii: S1097-2765(18)30986-9. doi:, 10.1016/j.molcel.2018.11.016. PMID:30595438<ref>PMID:30595438</ref>
+
==See Also==
-
 
+
*[[Endonuclease 3D structures|Endonuclease 3D structures]]
-
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+
-
</div>
+
-
<div class="pdbe-citations 6mcb" style="background-color:#fffaf0;"></div>
+
-
== References ==
+
-
<references/>
+
__TOC__
__TOC__
-
</StructureSection>
+
</SX>
-
[[Category: Doudna, J A]]
+
[[Category: Large Structures]]
-
[[Category: Jiang, F]]
+
[[Category: Listeria phage LP-101]]
-
[[Category: Liu, J J]]
+
[[Category: Streptococcus pyogenes M1 GAS]]
-
[[Category: Acriia2]]
+
[[Category: Doudna JA]]
-
[[Category: Anti-crispr]]
+
[[Category: Jiang F]]
-
[[Category: Bacteriophage]]
+
[[Category: Liu JJ]]
-
[[Category: Cas9]]
+
-
[[Category: Cas9 inhibitor]]
+
-
[[Category: Crispr-ca]]
+
-
[[Category: Gene editing]]
+
-
[[Category: Hydrolase-rna-viral protein complex]]
+

Current revision

CryoEM structure of AcrIIA2 in complex with CRISPR-Cas9

6mcb, resolution 3.40Å

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6mcb"
Personal tools