5WC9

Human Pit-1 and 4xCATT DNA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Biochemical and structural characterization of a novel cooperative binding mode by Pit-1 with CATT repeats in the macrophage migration inhibitory factor promoter.

Agarwal, S.Cho, T.Y.

(2018) Nucleic Acids Res. 46: 929-941

  • DOI: 10.1093/nar/gkx1183

  • PubMed Abstract: 
  • Overexpression of the proinflammatory cytokine macrophage migration inhibitory factor (MIF) is linked to a number of autoimmune diseases and cancer. MIF production has been correlated to the number of CATT repeats in a microsatellite region upstream ...

    Overexpression of the proinflammatory cytokine macrophage migration inhibitory factor (MIF) is linked to a number of autoimmune diseases and cancer. MIF production has been correlated to the number of CATT repeats in a microsatellite region upstream of the MIF gene. We have characterized the interaction of pituitary-specific positive transcription factor 1 (Pit-1) with a portion of the MIF promoter region flanking a microsatellite polymorphism (-794 CATT5-8). Using fluorescence anisotropy, we quantified tight complex formation between Pit-1 and an oligonucleotide consisting of eight consecutive CATT repeats (8xCATT) with an apparent Kd of 35 nM. Using competition experiments we found a 23 base pair oligonucleotide with 4xCATT repeats to be the minimum DNA sequence necessary for high affinity interaction with Pit-1. The stoichiometry of the Pit-1 DNA interaction was determined to be 2:1 and binding is cooperative in nature. We subsequently structurally characterized the complex and discovered a completely novel binding mode for Pit-1 in contrast to previously described Pit-1 complex structures. The affinity of Pit-1 for the CATT target sequence was found to be highly dependent on cooperativity. This work lays the groundwork for understanding transcriptional regulation of MIF and pursuing Pit-1 as a therapeutic target to treat MIF-mediated inflammatory disorders.


    Organizational Affiliation

    Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO 63104, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pituitary-specific positive transcription factor 1
B, A, E, F
152Homo sapiensGene Names: POU1F1 (GHF1, PIT1)
Find proteins for P28069 (Homo sapiens)
Go to Gene View: POU1F1
Go to UniProtKB:  P28069
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*CP*AP*TP*TP*CP*AP*TP*TP*CP*AP*TP*TP*CP*AP*TP*TP*CP*GP*GP*A)-3')C,G21Homo sapiens
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*CP*GP*AP*AP*TP*GP*AP*AP*TP*GP*AP*AP*TP*GP*AP*AP*TP*GP*GP*T)-3')D,H21Homo sapiens
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.231 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 66.415α = 90.00
b = 97.518β = 93.65
c = 85.093γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
PHASERphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2017-06-29 
  • Released Date: 2017-11-22 
  • Deposition Author(s): Agarwal, S., Cho, T.Y.

Revision History 

  • Version 1.0: 2017-11-22
    Type: Initial release
  • Version 1.1: 2017-12-13
    Type: Database references
  • Version 1.2: 2018-02-07
    Type: Database references