8SRO

FoxP3 tetramer on TTTG repeats


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

FOXP3 recognizes microsatellites and bridges DNA through multimerization.

Zhang, W.Leng, F.Wang, X.Ramirez, R.N.Park, J.Benoist, C.Hur, S.

(2023) Nature 624: 433-441

  • DOI: https://doi.org/10.1038/s41586-023-06793-z
  • Primary Citation of Related Structures:  
    8SRO, 8SRP

  • PubMed Abstract: 

    FOXP3 is a transcription factor that is essential for the development of regulatory T cells, a branch of T cells that suppress excessive inflammation and autoimmunity 1-5 . However, the molecular mechanisms of FOXP3 remain unclear. Here we here show that FOXP3 uses the forkhead domain-a DNA-binding domain that is commonly thought to function as a monomer or dimer-to form a higher-order multimer after binding to T n G repeat microsatellites. The cryo-electron microscopy structure of FOXP3 in a complex with T 3 G repeats reveals a ladder-like architecture, whereby two double-stranded DNA molecules form the two 'side rails' bridged by five pairs of FOXP3 molecules, with each pair forming a 'rung'. Each FOXP3 subunit occupies TGTTTGT within the repeats in a manner that is indistinguishable from that of FOXP3 bound to the forkhead consensus motif (TGTTTAC). Mutations in the intra-rung interface impair T n G repeat recognition, DNA bridging and the cellular functions of FOXP3, all without affecting binding to the forkhead consensus motif. FOXP3 can tolerate variable inter-rung spacings, explaining its broad specificity for T n G-repeat-like sequences in vivo and in vitro. Both FOXP3 orthologues and paralogues show similar T n G repeat recognition and DNA bridging. These findings therefore reveal a mode of DNA recognition that involves transcription factor homomultimerization and DNA bridging, and further implicates microsatellites in transcriptional regulation and diseases.


  • Organizational Affiliation

    Howard Hughes Medical Institute and Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Forkhead box protein P3A,
B [auth D],
C [auth B],
D [auth C]
236Mus musculusMutation(s): 0 
Gene Names: Foxp3
UniProt
Find proteins for Q99JB6 (Mus musculus)
Explore Q99JB6 
Go to UniProtKB:  Q99JB6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99JB6
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA 72-merE [auth J],
G [auth F]
72synthetic construct
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA 72-merF [auth I],
H [auth E]
72synthetic construct
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-10-18
    Type: Initial release
  • Version 1.1: 2023-12-13
    Changes: Database references
  • Version 1.2: 2023-12-27
    Changes: Database references