6o74
From Proteopedia
(Difference between revisions)
| (One intermediate revision not shown.) | |||
| Line 1: | Line 1: | ||
| - | '''Unreleased structure''' | ||
| - | + | ==Crystal structure of Csm1-Csm4 cassette in complex with AMPPNP== | |
| + | <StructureSection load='6o74' size='340' side='right'caption='[[6o74]], [[Resolution|resolution]] 2.71Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[6o74]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermococcus_onnurineus Thermococcus onnurineus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6O74 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6O74 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]] 2.71Å</td></tr> | ||
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</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=6o74 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6o74 OCA], [https://pdbe.org/6o74 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6o74 RCSB], [https://www.ebi.ac.uk/pdbsum/6o74 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6o74 ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/CSM4_THEON CSM4_THEON] 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). The type III-A Csm effector complex binds crRNA and acts as a crRNA-guided RNase, DNase and cyclic oligoadenylate synthase; binding of target RNA cognate to the crRNA is required for all activities.[UniProtKB:A0A0A7HGA1] The subunit probably binds to the 5' handle of the crRNA, helping in discrimination between self- and non-self.[UniProtKB:A0A0A7HGA1] | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Target RNA binding to crRNA-bound type III-A CRISPR-Cas multi-subunit Csm surveillance complexes activates cyclic-oligoadenylate (cAn) formation from ATP subunits positioned within the composite pair of Palm domain pockets of the Csm1 subunit. The generated cAn second messenger in turn targets the CARF domain of trans-acting RNase Csm6, triggering its HEPN domain-based RNase activity. We have undertaken cryo-EM studies on multi-subunit Thermococcus onnurineus Csm effector ternary complexes, as well as X-ray studies on Csm1-Csm4 cassette, both bound to substrate (AMPPNP), intermediates (pppAn), and products (cAn), to decipher mechanistic aspects of cAn formation and release. A network of intermolecular hydrogen bond alignments accounts for the observed adenosine specificity, with ligand positioning dictating formation of linear pppAn intermediates and subsequent cAn formation by cyclization. We combine our structural results with published functional studies to highlight mechanistic insights into the role of the Csm effector complex in mediating the cAn signaling pathway. | ||
| - | + | Second Messenger cA4 Formation within the Composite Csm1 Palm Pocket of Type III-A CRISPR-Cas Csm Complex and Its Release Path.,Jia N, Jones R, Sukenick G, Patel DJ Mol Cell. 2019 Jun 28. pii: S1097-2765(19)30446-0. doi:, 10.1016/j.molcel.2019.06.013. PMID:31326272<ref>PMID:31326272</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| + | <div class="pdbe-citations 6o74" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Thermococcus onnurineus]] | ||
| + | [[Category: Jia N]] | ||
| + | [[Category: Patel DJ]] | ||
Current revision
Crystal structure of Csm1-Csm4 cassette in complex with AMPPNP
| |||||||||||
