5EEA

Structure of HOXB13-DNA(CAA) complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.252 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Two distinct DNA sequences recognized by transcription factors represent enthalpy and entropy optima.

Morgunova, E.Yin, Y.Das, P.K.Jolma, A.Zhu, F.Popov, A.Xu, Y.Nilsson, L.Taipale, J.

(2018) Elife 7

  • DOI: https://doi.org/10.7554/eLife.32963
  • Primary Citation of Related Structures:  
    5EDN, 5EEA, 6ES2, 6ES3

  • PubMed Abstract: 

    Most transcription factors (TFs) can bind to a population of sequences closely related to a single optimal site. However, some TFs can bind to two distinct sequences that represent two local optima in the Gibbs free energy of binding (ΔG). To determine the molecular mechanism behind this effect, we solved the structures of human HOXB13 and CDX2 bound to their two optimal DNA sequences, CAATAAA and TCGTAAA. Thermodynamic analyses by isothermal titration calorimetry revealed that both sites were bound with similar ΔG. However, the interaction with the CAA sequence was driven by change in enthalpy (ΔH), whereas the TCG site was bound with similar affinity due to smaller loss of entropy (ΔS). This thermodynamic mechanism that leads to at least two local optima likely affects many macromolecular interactions, as ΔG depends on two partially independent variables ΔH and ΔS according to the central equation of thermodynamics, ΔG = ΔH - TΔS.


  • Organizational Affiliation

    Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Homeobox protein Hox-B13I [auth B],
J [auth A],
K [auth G],
L [auth J]
63Homo sapiensMutation(s): 0 
Gene Names: HOXB13
UniProt & NIH Common Fund Data Resources
Find proteins for Q92826 (Homo sapiens)
Explore Q92826 
Go to UniProtKB:  Q92826
PHAROS:  Q92826
GTEx:  ENSG00000159184 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92826
Sequence Annotations
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  • Reference Sequence

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Entity ID: 1
MoleculeChains LengthOrganismImage
DNA (5'-D(P*TP*TP*GP*TP*GP*TP*TP*TP*TP*AP*TP*TP*GP*GP*GP*TP*CP*C)-3')A [auth D],
C,
E [auth H],
G [auth K]
18synthetic construct
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*GP*GP*AP*CP*CP*CP*AP*AP*TP*AP*AP*AP*AP*CP*AP*CP*AP*A)-3')B [auth E],
D [auth F],
F [auth I],
H [auth L]
18synthetic construct
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.252 
  • Space Group: P 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.356α = 90
b = 57.918β = 101.57
c = 101.278γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2018-08-15
    Changes: Data collection, Database references
  • Version 1.2: 2019-10-30
    Changes: Advisory, Data collection, Derived calculations
  • Version 1.3: 2024-01-10
    Changes: Data collection, Database references, Refinement description