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| | ==Crystal structure of the Thermus thermophilus cas3 HD domain== | | ==Crystal structure of the Thermus thermophilus cas3 HD domain== |
| - | <StructureSection load='3sk9' size='340' side='right' caption='[[3sk9]], [[Resolution|resolution]] 1.80Å' scene=''> | + | <StructureSection load='3sk9' size='340' side='right'caption='[[3sk9]], [[Resolution|resolution]] 1.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3sk9]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Thet8 Thet8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SK9 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3SK9 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3sk9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thet8 Thet8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SK9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3SK9 FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3skd|3skd]]</td></tr> | + | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3skd|3skd]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TTHB187 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=300852 THET8])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TTHB187 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=300852 THET8])</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=3sk9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3sk9 OCA], [http://pdbe.org/3sk9 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3sk9 RCSB], [http://www.ebi.ac.uk/pdbsum/3sk9 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3sk9 ProSAT]</span></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=3sk9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3sk9 OCA], [https://pdbe.org/3sk9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3sk9 RCSB], [https://www.ebi.ac.uk/pdbsum/3sk9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3sk9 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CAS3_THET8 CAS3_THET8]] 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 sequences complementary to antecedent mobile elements and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA). Cas3 plus Cascade participate in CRISPR interference, the third stage of CRISPR immunity. The N-terminal domain (residues 6-260) acts as a ssDNA endonuclease, has no activity on dsDNA.<ref>PMID:21775431</ref> | + | [[https://www.uniprot.org/uniprot/CAS3_THET8 CAS3_THET8]] 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 sequences complementary to antecedent mobile elements and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA). Cas3 plus Cascade participate in CRISPR interference, the third stage of CRISPR immunity. The N-terminal domain (residues 6-260) acts as a ssDNA endonuclease, has no activity on dsDNA.<ref>PMID:21775431</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| | + | [[Category: Large Structures]] |
| | [[Category: Thet8]] | | [[Category: Thet8]] |
| | [[Category: Bailey, S]] | | [[Category: Bailey, S]] |
| Structural highlights
Function
[CAS3_THET8] 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 sequences complementary to antecedent mobile elements and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA). Cas3 plus Cascade participate in CRISPR interference, the third stage of CRISPR immunity. The N-terminal domain (residues 6-260) acts as a ssDNA endonuclease, has no activity on dsDNA.[1]
Publication Abstract from PubMed
RNA transcribed from clustered regularly interspaced short palindromic repeats (CRISPRs) protects many prokaryotes from invasion by foreign DNA such as viruses, conjugative plasmids and transposable elements. CRISPR-associated protein 3 (Cas3) is essential for this CRISPR protection and is thought to mediate cleavage of the foreign DNA through its N-terminal histidine-aspartate (HD) domain. We report here the 1.8 A crystal structure of the HD domain of cas3 from Thermus thermophilus HB8. Structural and biochemical studies predict that this enzyme binds two metal ions at its active site. We also demonstrate that the single-stranded DNA endonuclease activity of this T. thermophilus domain is activated not by magnesium, but by transition metal ions such as manganese and nickel. Structure-guided mutagenesis confirms the importance of the metal binding residues for the nuclease activity, and identifies other active site residues. Overall, these results provide a framework for understanding the role of cas3 in the CRISPR system.
Structural and biochemical analysis of the nuclease domain of the clustered regularly interspaced short palindromic repeat (CRISPR) associated protein 3(CAS3).,Mulepati S, Bailey S J Biol Chem. 2011 Jul 20. PMID:21775431[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Mulepati S, Bailey S. Structural and biochemical analysis of the nuclease domain of the clustered regularly interspaced short palindromic repeat (CRISPR) associated protein 3(CAS3). J Biol Chem. 2011 Jul 20. PMID:21775431 doi:10.1074/jbc.M111.270017
- ↑ Mulepati S, Bailey S. Structural and biochemical analysis of the nuclease domain of the clustered regularly interspaced short palindromic repeat (CRISPR) associated protein 3(CAS3). J Biol Chem. 2011 Jul 20. PMID:21775431 doi:10.1074/jbc.M111.270017
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