5E8G

Crystal structure of the DNA binding domain of human transcription factor FLI1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural Basis for Dimerization and DNA Binding of Transcription Factor FLI1.

Hou, C.Tsodikov, O.V.

(2015) Biochemistry 54: 7365-7374

  • DOI: 10.1021/acs.biochem.5b01121
  • Primary Citation of Related Structures:  
    5E8G, 5E8I

  • PubMed Abstract: 
  • FLI1 (Friend leukemia integration 1) is a metazoan transcription factor that is upregulated in a number of cancers. In addition, rearrangements of the fli1 gene cause sarcomas, leukemias, and lymphomas. These rearrangements encode oncogenic transcription ...

    FLI1 (Friend leukemia integration 1) is a metazoan transcription factor that is upregulated in a number of cancers. In addition, rearrangements of the fli1 gene cause sarcomas, leukemias, and lymphomas. These rearrangements encode oncogenic transcription factors, in which the DNA binding domain (DBD or ETS domain) of FLI1 on the C-terminal side is fused to a part of an another protein on the N-terminal side. Such abnormal cancer cell-specific fusions retain the DNA binding properties of FLI1 and acquire non-native protein-protein or protein-nucleic acid interactions of the substituted region. As a result, these fusions trigger oncogenic transcriptional reprogramming of the host cell. Interactions of FLI1 fusions with other proteins and with itself play a critical role in the oncogenic regulatory functions, and they are currently under intense scrutiny, mechanistically and as potential novel anticancer drug targets. We report elusive crystal structures of the FLI1 DBD, alone and in complex with cognate DNA containing a GGAA recognition sequence. Both structures reveal a previously unrecognized dimer of this domain, consistent with its dimerization in solution. The homodimerization interface is helix-swapped and dominated by hydrophobic interactions, including those between two interlocking Phe362 residues. A mutation of Phe362 to an alanine disrupted the propensity of this domain to dimerize without perturbing its structure or the DNA binding function, consistent with the structural observations. We propose that FLI1 DBD dimerization plays a role in transcriptional activation and repression by FLI1 and its fusions at promoters containing multiple FLI1 binding sites.


    Organizational Affiliation

    Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky , 789 South Limestone Street, Lexington, Kentucky 40536-0596, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Friend leukemia integration 1 transcription factor ABCD128Homo sapiensMutation(s): 0 
Gene Names: FLI1
Find proteins for Q01543 (Homo sapiens)
Explore Q01543 
Go to UniProtKB:  Q01543
NIH Common Fund Data Resources
PHAROS:  Q01543
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 140.551α = 90
b = 140.551β = 90
c = 85.14γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOLREPphasing
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-12-09
    Type: Initial release
  • Version 1.1: 2015-12-16
    Changes: Database references
  • Version 1.2: 2015-12-30
    Changes: Database references
  • Version 1.3: 2019-11-20
    Changes: Database references, Derived calculations