5DQT

Crystal Structure of Cas-DNA-22 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and Mechanistic Basis of PAM-Dependent Spacer Acquisition in CRISPR-Cas Systems.

Wang, J.Li, J.Zhao, H.Sheng, G.Wang, M.Yin, M.Wang, Y.

(2015) Cell 163: 840-853

  • DOI: https://doi.org/10.1016/j.cell.2015.10.008
  • Primary Citation of Related Structures:  
    5DLJ, 5DQT, 5DQU, 5DQZ

  • PubMed Abstract: 

    Bacteria acquire memory of viral invaders by incorporating invasive DNA sequence elements into the host CRISPR locus, generating a new spacer within the CRISPR array. We report on the structures of Cas1-Cas2-dual-forked DNA complexes in an effort toward understanding how the protospacer is sampled prior to insertion into the CRISPR locus. Our study reveals a protospacer DNA comprising a 23-bp duplex bracketed by tyrosine residues, together with anchored flanking 3' overhang segments. The PAM-complementary sequence in the 3' overhang is recognized by the Cas1a catalytic subunits in a base-specific manner, and subsequent cleavage at positions 5 nt from the duplex boundary generates a 33-nt DNA intermediate that is incorporated into the CRISPR array via a cut-and-paste mechanism. Upon protospacer binding, Cas1-Cas2 undergoes a significant conformational change, generating a flat surface conducive to proper protospacer recognition. Here, our study provides important structure-based mechanistic insights into PAM-dependent spacer acquisition.


  • Organizational Affiliation

    Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; Beijing Key Laboratory of Noncoding RNA, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated endonuclease Cas1305Escherichia coli K-12Mutation(s): 0 
Gene Names: ygbTcas1b2755JW2725
EC: 3.1
UniProt
Find proteins for Q46896 (Escherichia coli (strain K12))
Explore Q46896 
Go to UniProtKB:  Q46896
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ46896
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated endoribonuclease Cas2E [auth F],
F [auth E],
K [auth N],
L [auth M]
94Escherichia coli K-12Mutation(s): 0 
Gene Names: ygbFcas2b2754JW5438
EC: 3.1
UniProt
Find proteins for P45956 (Escherichia coli (strain K12))
Explore P45956 
Go to UniProtKB:  P45956
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP45956
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  • Reference Sequence
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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (34-MER)M [auth G],
O
34Escherichia coli
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains LengthOrganismImage
DNA (33-MER)N [auth H],
P
33Escherichia coli
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.434α = 90
b = 194.955β = 90.22
c = 195.202γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing
HKL-2000data processing
HKL-2000data reduction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
China--

Revision History  (Full details and data files)

  • Version 1.0: 2015-11-11
    Type: Initial release
  • Version 1.1: 2015-11-18
    Changes: Database references
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Derived calculations