4TVX

Crystal structure of the E. coli CRISPR RNA-guided surveillance complex, Cascade


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.24 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

Structural biology. Crystal structure of the CRISPR RNA-guided surveillance complex from Escherichia coli.

Jackson, R.N.Golden, S.M.van Erp, P.B.Carter, J.Westra, E.R.Brouns, S.J.van der Oost, J.Terwilliger, T.C.Read, R.J.Wiedenheft, B.

(2014) Science 345: 1473-1479

  • DOI: 10.1126/science.1256328
  • Primary Citation of Related Structures:  
    4TVX

  • PubMed Abstract: 
  • Clustered regularly interspaced short palindromic repeats (CRISPRs) are essential components of RNA-guided adaptive immune systems that protect bacteria and archaea from viruses and plasmids. In Escherichia coli, short CRISPR-derived RNAs (crRNAs) assemble into a 405-kilodalton multisubunit surveillance complex called Cascade (CRISPR-associated complex for antiviral defense) ...

    Clustered regularly interspaced short palindromic repeats (CRISPRs) are essential components of RNA-guided adaptive immune systems that protect bacteria and archaea from viruses and plasmids. In Escherichia coli, short CRISPR-derived RNAs (crRNAs) assemble into a 405-kilodalton multisubunit surveillance complex called Cascade (CRISPR-associated complex for antiviral defense). Here we present the 3.24 angstrom resolution x-ray crystal structure of Cascade. Eleven proteins and a 61-nucleotide crRNA assemble into a seahorse-shaped architecture that binds double-stranded DNA targets complementary to the crRNA-guide sequence. Conserved sequences on the 3' and 5' ends of the crRNA are anchored by proteins at opposite ends of the complex, whereas the guide sequence is displayed along a helical assembly of six interwoven subunits that present five-nucleotide segments of the crRNA in pseudo-A-form configuration. The structure of Cascade suggests a mechanism for assembly and provides insights into the mechanisms of target recognition.


    Organizational Affiliation

    Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA. bwiedenheft@gmail.com.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR system Cascade subunit CasBD [auth J], C [auth K], B [auth V], A [auth W]165Escherichia coli K-12Mutation(s): 0 
Gene Names: casBcse2ygcKb2759JW2729
UniProt
Find proteins for P76632 (Escherichia coli (strain K12))
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Go to UniProtKB:  P76632
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR system Cascade subunit CasC363Escherichia coli K-12Mutation(s): 0 
Gene Names: casCcas4cse4ygcJb2758JW2728
UniProt
Find proteins for Q46899 (Escherichia coli (strain K12))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR system Cascade subunit CasEK [auth A], T [auth M]199Escherichia coli K-12Mutation(s): 0 
Gene Names: casEcas6eygcHb2756JW2726
EC: 3.1
UniProt
Find proteins for Q46897 (Escherichia coli (strain K12))
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR system Cascade subunit CasDL [auth H], S [auth T]224Escherichia coli K-12Mutation(s): 0 
Gene Names: casDcas5ygcIb2757JW5844
UniProt
Find proteins for Q46898 (Escherichia coli (strain K12))
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR system Cascade subunit CasAX [auth I], W [auth U]502Escherichia coli K-12Mutation(s): 0 
Gene Names: casAcse1ygcLb2760JW2730
UniProt
Find proteins for Q46901 (Escherichia coli (strain K12))
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsLengthOrganismImage
Escherichia coli strain ECOR44 cluster 1 CRISPR regionU [auth L], V [auth X]61Escherichia coli
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
Y [auth U], Z [auth I]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.24 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.234 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 200.851α = 90
b = 214.541β = 90
c = 217.383γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesP20GM103500
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM108888
National Science Foundation (NSF, United States)United StatesEPS-110134
National Institutes of Health NRSAUnited StatesF32GM108436

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2014-08-20
    Changes: Derived calculations, Other
  • Version 1.2: 2014-08-27
    Changes: Database references
  • Version 1.3: 2014-10-01
    Changes: Database references
  • Version 1.4: 2014-12-10
    Changes: Other
  • Version 1.5: 2017-09-06
    Changes: Author supporting evidence, Database references, Derived calculations, Source and taxonomy
  • Version 1.6: 2019-11-27
    Changes: Author supporting evidence