4AAD

Crystal structure of the mutant D75N I-CreI in complex with its wild- type target in absence of metal ions at the active site (The four central bases, 2NN region, are composed by GTAC from 5' to 3')


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Non-Specific Protein-DNA Interactions Control I-Crei Target Binding and Cleavage.

Molina, R.Redondo, P.Stella, S.Marenchino, M.D'Abramo, M.Gervasio, F.L.Charles Epinat, J.Valton, J.Grizot, S.Duchateau, P.Prieto, J.Montoya, G.

(2012) Nucleic Acids Res 40: 6936-6945

  • DOI: https://doi.org/10.1093/nar/gks320
  • Primary Citation of Related Structures:  
    4AAB, 4AAD, 4AAE, 4AAF, 4AAG

  • PubMed Abstract: 

    Homing endonucleases represent protein scaffolds that provide powerful tools for genome manipulation, as these enzymes possess a very low frequency of DNA cleavage in eukaryotic genomes due to their high specificity. The basis of protein-DNA recognition must be understood to generate tailored enzymes that target the DNA at sites of interest. Protein-DNA interaction engineering of homing endonucleases has demonstrated the potential of these approaches to create new specific instruments to target genes for inactivation or repair. Protein-DNA interface studies have been focused mostly on specific contacts between amino acid side chains and bases to redesign the binding interface. However, it has been shown that 4 bp in the central DNA sequence of the 22-bp substrate of a homing endonuclease (I-CreI), which do not show specific protein-DNA interactions, is not devoid of content information. Here, we analyze the mechanism of target discrimination in this substrate region by the I-CreI protein, determining how it can occur independently of the specific protein-DNA interactions. Our data suggest the important role of indirect readout in this substrate region, opening the possibility for a fully rational search of new target sequences, thus improving the development of redesigned enzymes for therapeutic and biotechnological applications.


  • Organizational Affiliation

    Structural Biology and Biocomputing Programme, Spanish National Cancer Research Centre (CNIO), Macromolecular Crystallography Group, Madrid, Spain.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA ENDONUCLEASE I-CREI
A, B
152Chlamydomonas reinhardtiiMutation(s): 1 
EC: 3.1
UniProt
Find proteins for P05725 (Chlamydomonas reinhardtii)
Explore P05725 
Go to UniProtKB:  P05725
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05725
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
24MER DNAC [auth E],
D [auth F]
24synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.406α = 90
b = 84.668β = 90
c = 159.959γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-02
    Type: Initial release
  • Version 1.1: 2012-08-22
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description