3GOD

Structural basis for DNase activity of a conserved protein implicated in CRISPR-mediated antiviral defense

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.206 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Structural Basis for DNase Activity of a Conserved Protein Implicated in CRISPR-Mediated Genome Defense.

Wiedenheft, B., Zhou, K., Jinek, M., Coyle, S.M., Ma, W., Doudna, J.A.

(2009) Structure 17: 904-912

  • DOI: 10.1016/j.str.2009.03.019
  • Primary Citation of Related Structures:  
    3GOD

  • PubMed Abstract: 

    • Acquired immunity in prokaryotes is achieved by integrating short fragments of foreign nucleic acids into clustered regularly interspaced short palindromic repeats (CRISPRs). This nucleic acid-based immune system is mediated by a variable cassette of up to 45 protein families that represent distinct immune system subtypes ...

    Acquired immunity in prokaryotes is achieved by integrating short fragments of foreign nucleic acids into clustered regularly interspaced short palindromic repeats (CRISPRs). This nucleic acid-based immune system is mediated by a variable cassette of up to 45 protein families that represent distinct immune system subtypes. CRISPR-associated gene 1 (cas1) encodes the only universally conserved protein component of CRISPR immune systems, yet its function is unknown. Here we show that the Cas1 protein is a metal-dependent DNA-specific endonuclease that produces double-stranded DNA fragments of approximately 80 base pairs in length. The 2.2 A crystal structure of the Cas1 protein reveals a distinct fold and a conserved divalent metal ion-binding site. Mutation of metal ion-binding residues, chelation of metal ions, or metal-ion substitution inhibits Cas1-catalyzed DNA degradation. These results provide a foundation for understanding how Cas1 contributes to CRISPR function, perhaps as part of the machinery for processing foreign nucleic acids.

    Organizational Affiliation: 

    Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cas1 A, B, C, D328Pseudomonas aeruginosa UCBPP-PA14Mutation(s): 0 
Gene Names: PA14_33350, cas1
EC: 3.1
Find proteins for Q02ML7 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore Q02ML7 
Go to UniProtKB:  Q02ML7
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A,B,C,DL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.87α = 90
b = 110.96β = 90
c = 130.25γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
PHENIXmodel building
PHENIXrefinement
XDSdata reduction
PHENIXphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2009-03-18 
  • Released Date: 2009-06-30 
    • Deposition Author(s): Wiedenheft, B.

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance