4qr1

From Proteopedia

(Difference between revisions)

Revision as of 20:56, 4 August 2016

Crystal structure of Streptococcus pyogenes Cas2 at pH 6.5

Structural highlights

4qr1 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	4qr0, 4qr2
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[Q99YS8_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 sequences complementary to antecedent mobile elements and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA). Functions as a ssRNA-specific endoribonuclease. Involved in the integration of spacer DNA into the CRISPR cassette.[HAMAP-Rule:MF_01471]

Publication Abstract from PubMed

Clustered regularly interspaced short palindromic repeats (CRISPRs) and CRISPR-associated (Cas) proteins constitute an RNA-guided microbial defense system against invading foreign genetic materials. Cas2 is one of the core Cas proteins found universally in all the subtypes of CRISPR-Cas systems and is required for incorporating new spacers into CRISPR loci. Cas2 homologues from different CRISPR-Cas subtypes were characterized previously as metal-dependent nucleases with different substrate preferences, and it was proposed that a pH-dependent conformational change mediates metal binding and catalysis. Here, we report the crystal structures of Streptococcus pyogenes Cas2 at three different pHs (5.6, 6.5, and 7.5), as well as the results of its nuclease activity assay against double-stranded DNAs at varying pHs (6.0-9.0). Although S. pyogenes Cas2 exhibited strongly pH-dependent catalytic activity, there was no significant conformational difference among the three crystal structures. However, structural comparisons with other Cas2 homologues revealed structural variability and the flexible nature of its putative hinge regions, supporting the hypothesis that conformational switching is important for catalysis. Taken together, our results confirm that Cas2 proteins have pH-dependent nuclease activity against double-stranded DNAs, and provide indirect structural evidence for their conformational changes.

Structural and functional characterization of Streptococcus pyogenes Cas2 protein under different pH conditions.,Ka D, Kim D, Baek G, Bae E Biochem Biophys Res Commun. 2014 Aug 15;451(1):152-7. doi:, 10.1016/j.bbrc.2014.07.087. Epub 2014 Jul 29. PMID:25079131^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Ka D, Kim D, Baek G, Bae E. Structural and functional characterization of Streptococcus pyogenes Cas2 protein under different pH conditions. Biochem Biophys Res Commun. 2014 Aug 15;451(1):152-7. doi:, 10.1016/j.bbrc.2014.07.087. Epub 2014 Jul 29. PMID:25079131 doi:http://dx.doi.org/10.1016/j.bbrc.2014.07.087

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4qr1"

@@ Line 1: / Line 1: @@
 ==Crystal structure of Streptococcus pyogenes Cas2 at pH 6.5==
 <StructureSection load='4qr1' size='340' side='right' caption='[[4qr1]], [[Resolution|resolution]] 2.19&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[4qr1]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QR1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4QR1 FirstGlance]. <br>
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4qr0|4qr0]], [[4qr2|4qr2]]</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=4qr1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qr1 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4qr1 RCSB], [http://www.ebi.ac.uk/pdbsum/4qr1 PDBsum]</span></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=4qr1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qr1 OCA], [http://pdbe.org/4qr1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4qr1 RCSB], [http://www.ebi.ac.uk/pdbsum/4qr1 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4qr1 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 16: / Line 17: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4qr1" style="background-color:#fffaf0;"></div>
 ==See Also==

4qr1

From Proteopedia

Revision as of 20:56, 4 August 2016

Crystal structure of Streptococcus pyogenes Cas2 at pH 6.5

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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