4cmq

From Proteopedia

(Difference between revisions)

Revision as of 09:16, 20 March 2019

Crystal structure of Mn-bound S.pyogenes Cas9

Structural highlights

4cmq is a 2 chain structure with sequence from Strp1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	4cmp
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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.^[1] ^[2]

Publication Abstract from PubMed

Type II CRISPR-Cas systems use an RNA-guided DNA endonuclease, Cas9, to generate double-strand breaks in invasive DNA during an adaptive bacterial immune response. Cas9 has been harnessed as a powerful tool for genome editing and gene regulation in many eukaryotic organisms. Here, we report 2.6 and 2.2 A resolution crystal structures of two major Cas9 enzymes subtypes, revealing the structural core shared by all Cas9 family members. The architectures of Cas9 enzymes define nucleic acid binding clefts, and single-particle electron microscopy reconstructions show that the two structural lobes harboring these clefts undergo guide RNA-induced reorientation to form a central channel where DNA substrates are bound. The observation that extensive structural rearrangements occur before target DNA duplex binding implicates guide RNA loading as a key step in Cas9 activation.

Structures of Cas9 Endonucleases Reveal RNA-Mediated Conformational Activation.,Jinek M, Jiang F, Taylor DW, Sternberg SH, Kaya E, Ma E, Anders C, Hauer M, Zhou K, Lin S, Kaplan M, Iavarone AT, Charpentier E, Nogales E, Doudna JA Science. 2014 Feb 6. PMID:24505130^[3]

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

References

↑ Deltcheva E, Chylinski K, Sharma CM, Gonzales K, Chao Y, Pirzada ZA, Eckert MR, Vogel J, Charpentier E. CRISPR RNA maturation by trans-encoded small RNA and host factor RNase III. Nature. 2011 Mar 31;471(7340):602-7. doi: 10.1038/nature09886. PMID:21455174 doi:http://dx.doi.org/10.1038/nature09886
↑ Jinek M, Chylinski K, Fonfara I, Hauer M, Doudna JA, Charpentier E. A programmable dual-RNA-guided DNA endonuclease in adaptive bacterial immunity. Science. 2012 Aug 17;337(6096):816-21. doi: 10.1126/science.1225829. Epub 2012, Jun 28. PMID:22745249 doi:http://dx.doi.org/10.1126/science.1225829
↑ Jinek M, Jiang F, Taylor DW, Sternberg SH, Kaya E, Ma E, Anders C, Hauer M, Zhou K, Lin S, Kaplan M, Iavarone AT, Charpentier E, Nogales E, Doudna JA. Structures of Cas9 Endonucleases Reveal RNA-Mediated Conformational Activation. Science. 2014 Feb 6. PMID:24505130 doi:http://dx.doi.org/10.1126/science.1247997

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/4cmq"

@@ Line 1: / Line 1: @@
 ==Crystal structure of Mn-bound S.pyogenes Cas9==
-<StructureSection load='4cmq' size='340' side='right' caption='[[4cmq]], [[Resolution|resolution]] 3.09&Aring;' scene=''>
+<StructureSection load='4cmq' size='340' side='right'caption='[[4cmq]], [[Resolution|resolution]] 3.09&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[4cmq]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Strp1 Strp1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CMQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4CMQ FirstGlance]. <br>
@@ Line 27: / Line 27: @@
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Strp1]]
 [[Category: Anders, C]]

4cmq

From Proteopedia

Revision as of 09:16, 20 March 2019

Crystal structure of Mn-bound S.pyogenes Cas9

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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