6QZQ

Crystal structure of Csx1 from Sulfolobus islandicus monoclinic form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of Csx1-cOA4complex reveals the basis of RNA decay in Type III-B CRISPR-Cas.

Molina, R.Stella, S.Feng, M.Sofos, N.Jauniskis, V.Pozdnyakova, I.Lopez-Mendez, B.She, Q.Montoya, G.

(2019) Nat Commun 10: 4302-4302

  • DOI: 10.1038/s41467-019-12244-z
  • Primary Citation of Related Structures:  
    6R7B, 6R9R, 6QZQ, 6QZT

  • PubMed Abstract: 
  • Type III CRISPR-Cas multisubunit complexes cleave ssRNA and ssDNA. These activities promote the generation of cyclic oligoadenylate (cOA), which activates associated CRISPR-Cas RNases from the Csm/Csx families, triggering a massive RNA decay to provide immunity from genetic invaders ...

    Type III CRISPR-Cas multisubunit complexes cleave ssRNA and ssDNA. These activities promote the generation of cyclic oligoadenylate (cOA), which activates associated CRISPR-Cas RNases from the Csm/Csx families, triggering a massive RNA decay to provide immunity from genetic invaders. Here we present the structure of Sulfolobus islandicus (Sis) Csx1-cOA 4 complex revealing the allosteric activation of its RNase activity. SisCsx1 is a hexamer built by a trimer of dimers. Each dimer forms a cOA 4 binding site and a ssRNA catalytic pocket. cOA 4 undergoes a conformational change upon binding in the second messenger binding site activating ssRNA degradation in the catalytic pockets. Activation is transmitted in an allosteric manner through an intermediate HTH domain, which joins the cOA 4 and catalytic sites. The RNase functions in a sequential cooperative fashion, hydrolyzing phosphodiester bonds in 5'-C-C-3'. The degradation of cOA 4 by Ring nucleases deactivates SisCsx1, suggesting that this enzyme could be employed in biotechnological applications.


    Organizational Affiliation

    The Novo Nordisk Foundation Center for Protein Research, Protein Structure & Function Programme, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200, Copenhagen, Denmark. guillermo.montoya@cpr.ku.dk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated (Cas) DxTHG familyA, B, C, D, E, F454Sulfolobus islandicus REY15AMutation(s): 0 
Gene Names: SiRe_0884
Find proteins for F0NE21 (Sulfolobus islandicus (strain REY15A))
Explore F0NE21 
Go to UniProtKB:  F0NE21
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.304α = 90
b = 119.579β = 106.25
c = 190.133γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Novo Nordisk FoundationDenmarkNNF14CC0001

Revision History 

  • Version 1.0: 2020-01-22
    Type: Initial release
  • Version 1.1: 2020-08-05
    Changes: Database references