6LFF

transcription factor SATB1 CUTr1 domain in complex with a phosphorothioate DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Enhanced affinity of racemic phosphorothioate DNA with transcription factor SATB1 arising from diastereomer-specific hydrogen bonds and hydrophobic contacts.

Yamasaki, K.Akutsu, Y.Yamasaki, T.Miyagishi, M.Kubota, T.

(2020) Nucleic Acids Res 48: 4551-4561

  • DOI: 10.1093/nar/gkaa170
  • Primary Citation of Related Structures:  
    6LFF

  • PubMed Abstract: 
  • Phosphorothioate modification is commonly introduced into therapeutic oligonucleotides, typically as a racemic mixture in which either of the two non-bridging phosphate oxygens is replaced by sulfur, which frequently increases affinities with proteins. Here, we used isothermal titration calorimetry and X-ray crystallography to investigate the thermodynamic and structural properties of the interaction between the primary DNA-binding domain (CUTr1) of transcription factor SATB1 and dodecamer DNAs with racemic phosphorothioate modifications at the six sites known to contact CUTr1 directly ...

    Phosphorothioate modification is commonly introduced into therapeutic oligonucleotides, typically as a racemic mixture in which either of the two non-bridging phosphate oxygens is replaced by sulfur, which frequently increases affinities with proteins. Here, we used isothermal titration calorimetry and X-ray crystallography to investigate the thermodynamic and structural properties of the interaction between the primary DNA-binding domain (CUTr1) of transcription factor SATB1 and dodecamer DNAs with racemic phosphorothioate modifications at the six sites known to contact CUTr1 directly. For both the modified and unmodified DNAs, the binding reactions were enthalpy-driven at a moderate salt concentration (50 mM NaCl), while being entropy-driven at higher salt concentrations with reduced affinities. The phosphorothioate modifications lowered this susceptibility to salt, resulting in a significantly enhanced affinity at a higher salt concentration (200 mM NaCl), although only some DNA molecular species remained interacting with CUTr1. This was explained by unequal populations of the two diastereomers in the crystal structure of the complex of CUTr1 and the phosphorothioate-modified DNA. The preferred diastereomer formed more hydrogen bonds with the oxygen atoms and/or more hydrophobic contacts with the sulfur atoms than the other, revealing the origins of the enhanced affinity.


    Organizational Affiliation

    Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8566, Japan.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-binding protein SATB1A, B93Homo sapiensMutation(s): 0 
Gene Names: SATB1
UniProt & NIH Common Fund Data Resources
Find proteins for Q01826 (Homo sapiens)
Explore Q01826 
Go to UniProtKB:  Q01826
PHAROS:  Q01826
Protein Feature View
Expand
  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*GP*(C7R)P*(PST)P*AP*AP*TP*AP*TP*AP*TP*GP*C)-3')C12synthetic construct
    Protein Feature View
    Expand
    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*GP*CP*AP*TP*(AS)P*(PST)P*(AS)P*(PST)P*TP*AP*GP*C)-3')D12synthetic construct
      Protein Feature View
      Expand
      • Reference Sequence
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 1.79 Å
      • R-Value Free: 0.271 
      • R-Value Work: 0.230 
      • R-Value Observed: 0.232 
      • Space Group: P 31
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 45.32α = 90
      b = 45.32β = 90
      c = 97.862γ = 120
      Software Package:
      Software NamePurpose
      REFMACrefinement
      MOSFLMdata reduction
      SCALAdata scaling
      MOLREPphasing

      Structure Validation

      View Full Validation Report



      Entry History & Funding Information

      Deposition Data


      Funding OrganizationLocationGrant Number
      Japan Society for the Promotion of Science (JSPS)Japan24570144

      Revision History  (Full details and data files)

      • Version 1.0: 2020-04-01
        Type: Initial release
      • Version 1.1: 2020-05-13
        Changes: Database references