5FW2

Crystal structure of SpCas9 variant EQR bound to sgRNA and TGAG PAM target DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.206 

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This is version 2.0 of the entry. See complete history. 


Literature

Structural Plasticity of Pam Recognition by Engineered Variants of the RNA-Guided Endonuclease Cas9.

Anders, C., Bargsten, K., Jinek, M.

(2016) Mol Cell 61: 895

  • DOI: 10.1016/j.molcel.2016.02.020
  • Primary Citation of Related Structures:  
    5FW1, 5FW2, 5FW3

  • PubMed Abstract: 

    • The RNA-guided endonuclease Cas9 from Streptococcus pyogenes (SpCas9) forms the core of a powerful genome editing technology. DNA cleavage by SpCas9 is dependent on the presence of a 5'-NGG-3' protospacer adjacent motif (PAM) in the target DNA, restricting the choice of targetable sequences ...

    The RNA-guided endonuclease Cas9 from Streptococcus pyogenes (SpCas9) forms the core of a powerful genome editing technology. DNA cleavage by SpCas9 is dependent on the presence of a 5'-NGG-3' protospacer adjacent motif (PAM) in the target DNA, restricting the choice of targetable sequences. To address this limitation, artificial SpCas9 variants with altered PAM specificities have recently been developed. Here we report crystal structures of the VQR, EQR, and VRER SpCas9 variants bound to target DNAs containing their preferred PAM sequences. The structures reveal that the non-canonical PAMs are recognized by an induced fit mechanism. Besides mediating sequence-specific base recognition, the amino acid substitutions introduced in the SpCas9 variants facilitate conformational remodeling of the PAM region of the bound DNA. Guided by the structural data, we engineered a SpCas9 variant that specifically recognizes NAAG PAMs. Taken together, these studies inform further development of Cas9-based genome editing tools.

    Organizational Affiliation: 

    Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. Electronic address: jinek@bioc.uzh.ch.



Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-ASSOCIATED ENDONUCLEASE CAS9/CSN1B1372Streptococcus pyogenesMutation(s): 5 
EC: 3.1
UniProt
Find proteins for Q99ZW2 (Streptococcus pyogenes serotype M1)
Explore Q99ZW2 
Go to UniProtKB:  Q99ZW2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99ZW2
Protein Feature View
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Entity ID: 1
MoleculeChainsLengthOrganismImage
SGRNAA 83synthetic construct
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Entity ID: 3
MoleculeChainsLengthOrganismImage
TARGET DNA STRANDC 28synthetic construct
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Entity ID: 4
MoleculeChainsLengthOrganismImage
NON-TARGET DNA STRANDD 12synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.206 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 177.74α = 90
b = 68.24β = 110.95
c = 188.22γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-15
    Type: Initial release
  • Version 2.0: 2019-10-23
    Changes: Atomic model, Data collection, Other