4QQX

Crystal structure of T. fusca Cas3-ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.34 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structures of CRISPR Cas3 offer mechanistic insights into Cascade-activated DNA unwinding and degradation.

Huo, Y.Nam, K.H.Ding, F.Lee, H.Wu, L.Xiao, Y.Farchione, M.D.Zhou, S.Rajashankar, K.Kurinov, I.Zhang, R.Ke, A.

(2014) Nat Struct Mol Biol 21: 771-777

  • DOI: https://doi.org/10.1038/nsmb.2875
  • Primary Citation of Related Structures:  
    4QQW, 4QQX, 4QQY, 4QQZ

  • PubMed Abstract: 

    CRISPR drives prokaryotic adaptation to invasive nucleic acids such as phages and plasmids, using an RNA-mediated interference mechanism. Interference in type I CRISPR-Cas systems requires a targeting Cascade complex and a degradation machine, Cas3, which contains both nuclease and helicase activities. Here we report the crystal structures of Thermobifida fusca Cas3 bound to single-stranded (ss) DNA substrate and show that it is an obligate 3'-to-5' ssDNase that preferentially accepts substrate directly from the helicase moiety. Conserved residues in the HD-type nuclease coordinate two irons for ssDNA cleavage. We demonstrate ATP coordination and conformational flexibility of the SF2-type helicase domain. Cas3 is specifically guided toward Cascade-bound target DNA by a PAM sequence, through physical interactions with both the nontarget substrate strand and the CasA protein. The sequence of recognition events ensures well-controlled DNA targeting and degradation of foreign DNA by Cascade and Cas3.


  • Organizational Affiliation

    1] Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, USA. [2].


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated helicase, Cas3 family
A, C, E, G
964Thermobifida fusca YXMutation(s): 0 
Gene Names: Tfu_1593
UniProt
Find proteins for Q47PJ0 (Thermobifida fusca (strain YX))
Explore Q47PJ0 
Go to UniProtKB:  Q47PJ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47PJ0
Sequence Annotations
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  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(P*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*AP*A)-3')
B, D, F, H
12N/A
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
K [auth A],
N [auth C],
Q [auth E],
T [auth G]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
FE
Query on FE

Download Ideal Coordinates CCD File 
I [auth A]
J [auth A]
L [auth C]
M [auth C]
O [auth E]
I [auth A],
J [auth A],
L [auth C],
M [auth C],
O [auth E],
P [auth E],
R [auth G],
S [auth G]
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.34 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.25α = 90
b = 222.807β = 104.1
c = 125.087γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-20
    Type: Initial release
  • Version 1.1: 2014-09-24
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description