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
  • Structures With Same Primary Citation

  • 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 protein ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-binding protein SATB1
A, B
93Homo sapiensMutation(s): 0 
Gene Names: SATB1
Find proteins for Q01826 (Homo sapiens)
Go to UniProtKB:  Q01826
NIH Common Fund Data Resources
PHAROS  Q01826
  • Find similar nucleic acids by: Sequence   |   Structure
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*(C7R)P*(PST)P*AP*AP*TP*AP*TP*AP*TP*GP*C)-3')C12synthetic construct
  • Find similar nucleic acids by: Sequence   |   Structure
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*AP*TP*(AS)P*(PST)P*(AS)P*(PST)P*TP*AP*GP*C)-3')D12synthetic construct
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 

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