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Crystal Structure of Foxp2 bound Specifically to DNA New Article

spinqualitylabelsall models PDB ID 2a07 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
2a07, resolution 1.90Å ()
Ligands:
Gene:	FOXP2, CAGH44, TNRC10 (Homo sapiens)
Structural annotation: Resources: InterPro : Ipr001766, Ipr015880, Ipr011991, Ipr007087 Pfam : PF00250 UniProt : O15409
Functional annotation: Cellular component: intracellular nucleus Biological process: transcription putamen development regulation of transcription, DNA-dependent caudate nucleus development Molecular function: sequence-specific DNA binding metal ion binding zinc ion binding protein homodimerization activity transcription factor activity nucleic acid binding DNA binding
Evolutionary conservation: Toggle Conservation Colors: Rows = identical sequences: Further Information: Caveats, Explanation, Complete Results at ConSurfDB
Resources:	FirstGlance, OCA, RCSB, PDBsum
Coordinates:	save as pdb, mmCIF, xml

Contents 1 Introduction 2 Evolutionary Conservation 3 DNA Binding 4 Domain Swapping 5 Disease Mutations 5.1 Arginine to Histidine at 553 5.2 Isoleucine to Valine at 363 5.3 Alanine to Threonine at 385 5.4 Arginine to Tryptophan at 397 5.5 Phenylalanine to Cystine at 371 and Phenylalanine to Leucine at 371 6 References

Introduction

FoxP2 is a transcription factor containing a winged-helix DNA binding domain, and is necessary for proper development of the lungs and brain. It is located on human chromosome 7 (7q31), and comprises 715 amino acids in its major splice form. FoxP2 is a member of the FOX (forkhead box) family and foxP subfamily of proteins, all of which contain a 90 amino acid winged-helix DNA binding motif. The foxP subfamily contains motifs like a glutamine-rich region, a leucine zipper, a zinc finger, and a forkhead domain, and is notable for conducting domain swapping.

Evolutionary Conservation

Because foxP2 is the first protein to be solidly linked to a human speech disorder, much investigation has focused on its evolutionary history in hopes of elucidating the molecular mechanism behind the uniqueness of human speech. Evidence suggests that the protein underwent a recent selective sweep within the same time frame as the rise of language in modern humans, supporting this idea. Chimpanzee, gorilla, and rhesus monkey foxP2 sequences are identical. The human version differs from these primate versions by two amino acid changes: a threonine to asparagine at position 303 and asparagine to serine at position 325.

DNA Binding

Domain Swapping

Disease Mutations

Disease mutations in FOXP2 and related proteins correspond to either the domain-swapping dimer interface or the DNA binding sequence. FOXP2 and FOXP3 are similar enough that the crystal structure of one can be used to explain the effects of mutation on structure in the other.

Arginine to Histidine at 553

This is the only mutation that has been characterized in the original FOXP2 protein.

Isoleucine to Valine at 363

Alanine to Threonine at 385

Arginine to Tryptophan at 397

Phenylalanine to Cystine at 371 and Phenylalanine to Leucine at 371

References

• Stroud JC, Wu Y, Bates DL, Han A, Nowick K, Paabo S, Tong H, Chen L. Structure of the forkhead domain of FOXP2 bound to DNA. Structure. 2006 Jan;14(1):159-66. PMID:16407075 doi:10.1016/j.str.2005.10.005