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5xlp

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Revision as of 20:10, 6 March 2020

Anti-CRISPR proteins AcrF1/2 bound to Csy surveillance complex with a 20nt spacer crRNA backbone region

5xlp, resolution 4.20Å

Structural highlights

5xlp is a 6 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[CSY3_PSEAB] 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 and Cascade participate in CRISPR interference, the third stage of CRISPR immunity (Potential). Involved in crRNA production or stability. The Csy ribonucleoprotein complex binds target ssDNA with high affinity but target dsDNA with much lower affinity.^[1] ^[2]

Publication Abstract from PubMed

Bacteriophages encode anti-CRISPR suppressors to counteract the CRISPR/Cas immunity of their bacterial hosts, thus facilitating their survival and replication. Previous studies have shown that two phage-encoded anti-CRISPR proteins, AcrF1 and AcrF2, suppress the type I-F CRISPR/Cas system of Pseudomonas aeruginosa by preventing target DNA recognition by the Csy surveillance complex, but the precise underlying mechanism was unknown. Here we present the structure of AcrF1/2 bound to the Csy complex determined by cryo-EM single-particle reconstruction. By structural analysis, we found that AcrF1 inhibits target DNA recognition of the Csy complex by interfering with base pairing between the DNA target strand and crRNA spacer. In addition, multiple copies of AcrF1 bind to the Csy complex with different modes when working individually or cooperating with AcrF2, which might exclude target DNA binding through different mechanisms. Together with previous reports, we provide a comprehensive working scenario for the two anti-CRISPR suppressors, AcrF1 and AcrF2, which silence CRISPR/Cas immunity by targeting the Csy surveillance complex.

Alternate binding modes of anti-CRISPR viral suppressors AcrF1/2 to Csy surveillance complex revealed by cryo-EM structures.,Peng R, Xu Y, Zhu T, Li N, Qi J, Chai Y, Wu M, Zhang X, Shi Y, Wang P, Wang J, Gao N, Gao GF Cell Res. 2017 Jul;27(7):853-864. doi: 10.1038/cr.2017.79. Epub 2017 Jun 2. PMID:28574055^[3]

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

References

↑ Cady KC, O'Toole GA. Non-identity-mediated CRISPR-bacteriophage interaction mediated via the Csy and Cas3 proteins. J Bacteriol. 2011 Jul;193(14):3433-45. doi: 10.1128/JB.01411-10. Epub 2011 Mar, 11. PMID:21398535 doi:http://dx.doi.org/10.1128/JB.01411-10
↑ Haurwitz RE, Sternberg SH, Doudna JA. Csy4 relies on an unusual catalytic dyad to position and cleave CRISPR RNA. EMBO J. 2012 Apr 20. doi: 10.1038/emboj.2012.107. PMID:22522703 doi:10.1038/emboj.2012.107
↑ Peng R, Xu Y, Zhu T, Li N, Qi J, Chai Y, Wu M, Zhang X, Shi Y, Wang P, Wang J, Gao N, Gao GF. Alternate binding modes of anti-CRISPR viral suppressors AcrF1/2 to Csy surveillance complex revealed by cryo-EM structures. Cell Res. 2017 Jul;27(7):853-864. doi: 10.1038/cr.2017.79. Epub 2017 Jun 2. PMID:28574055 doi:http://dx.doi.org/10.1038/cr.2017.79

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/5xlp"

@@ Line 1: / Line 1: @@
 ==Anti-CRISPR proteins AcrF1/2 bound to Csy surveillance complex with a 20nt spacer crRNA backbone region==
-<StructureSection load='5xlp' size='340' side='right' caption='[[5xlp]], [[Resolution|resolution]] 4.20&Aring;' scene=''>
+<SX load='5xlp' size='340' side='right' viewer='molstar' caption='[[5xlp]], [[Resolution|resolution]] 4.20&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[5xlp]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XLP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5XLP FirstGlance]. <br>
@@ Line 17: / Line 17: @@
 </div>
 <div class="pdbe-citations 5xlp" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[CRISPR subtype I-F|CRISPR subtype I-F]]
 == References ==
 <references/>
 __TOC__
-</StructureSection>
+</SX>
+[[Category: Large Structures]]
 [[Category: Gao, G F]]
 [[Category: Peng, R]]

5xlp

From Proteopedia

Revision as of 20:10, 6 March 2020

Anti-CRISPR proteins AcrF1/2 bound to Csy surveillance complex with a 20nt spacer crRNA backbone region

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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