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Structure of the forkhead domain of FOXP2 bound to DNA

James C Stroud1, Yongqing Wu, Darren L Bates

  • 1Department of Chemistry and Biochemistry, University of Colorado at Boulder, Colorado 80309, USA.

Structure (London, England : 1993)
|January 13, 2006
PubMed

Insights

The forkhead box P (FOXP) subfamily, including FOXP2 and FOXP3, plays roles in speech and autoimmune disorders. This study reveals the FOXP2 DNA binding structure, unifying FOX family models and identifying disease mutation sites.

Area of Science:

  • Molecular Biology
  • Genetics
  • Structural Biology

Background:

  • The forkhead box (FOX) transcription factor family includes the FOXP subfamily (FOXP1-4).
  • Mutations in FOXP2 are linked to speech disorders, while FOXP3 mutations cause IPEX syndrome and autoimmune issues.
  • Understanding the structural basis of FOXP protein function is crucial for deciphering their roles in human diseases.

Purpose of the Study:

  • To determine the crystal structure of the human FOXP2 forkhead domain bound to DNA.
  • To elucidate the DNA recognition mechanism of the FOXP2 protein.
  • To provide a unifying model for DNA binding across the FOX protein family.

Main Methods:

  • X-ray crystallography was used to obtain a 1.9 Å resolution structure of the FOXP2 forkhead domain complexed with DNA.
  • Bioinformatic analysis was employed to compare FOXP structures and identify conserved and unique features.
  • Mapping of disease-associated mutations onto the determined structure was performed.

Main Results:

  • The crystal structure of the human FOXP2 forkhead domain bound to DNA was determined.
  • A revised DNA recognition mechanism for FOXP2 was proposed, leading to a unifying model for FOX family DNA binding.
  • The FOXP2 forkhead domain was shown to form a domain-swapped dimer, facilitated by an alanine substitution for a conserved proline.
  • Disease-causing mutations in FOXP2 and FOXP3 were localized to either the DNA binding surface or the dimer interface.

Conclusions:

  • The determined structure provides critical insights into the DNA binding mechanism of the FOXP2 transcription factor.
  • This work establishes a unifying model for DNA binding within the broader FOX protein family.
  • The identification of the domain-swapping dimerization interface and the mapping of disease mutations highlight its functional significance and relevance to human disorders.

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