5d39

Transcription factor-DNA complex

spinqualitylabelsall models 5d39, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5d39 is a 8 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: PTR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [STAT6_HUMAN] Carries out a dual function: signal transduction and activation of transcription. Involved in interleukin-4 signalling. Publication Abstract from PubMed STAT6 participates in classical IL-4/IL-13 signaling and stimulator of interferon genes-mediated antiviral innate immune responses. Aberrations in STAT6-mediated signaling are linked to development of asthma and diseases of the immune system. In addition, STAT6 remains constitutively active in multiple types of cancer. Therefore, targeting STAT6 is an attractive proposition for treating related diseases. Although a lot is known about the role of STAT6 in transcriptional regulation, molecular details on how STAT6 recognizes and binds specific segments of DNA to exert its function are not clearly understood. Here, we report the crystal structures of a homodimer of phosphorylated STAT6 core fragment (STAT6CF) alone and bound with the N3 and N4 DNA binding site. Analysis of the structures reveals that STAT6 undergoes a dramatic conformational change on DNA binding, which was further validated by performing molecular dynamics simulation studies and small angle X-ray scattering analysis. Our data show that a larger angle at the intersection where the two protomers of STAT meet and the presence of a unique residue, H415, in the DNA-binding domain play important roles in discrimination of the N4 site DNA from the N3 site by STAT6. H415N mutation of STAT6CF decreased affinity of the protein for the N4 site DNA, but increased its affinity for N3 site DNA, both in vitro and in vivo. Results of our structure-function studies on STAT6 shed light on mechanism of DNA recognition by STATs in general and explain the reasons underlying STAT6's preference for N4 site DNA over N3. Structural basis for DNA recognition by STAT6.,Li J, Rodriguez JP, Niu F, Pu M, Wang J, Hung LW, Shao Q, Zhu Y, Ding W, Liu Y, Da Y, Yao Z, Yang J, Zhao Y, Wei GH, Cheng G, Liu ZJ, Ouyang S Proc Natl Acad Sci U S A. 2016 Nov 15;113(46):13015-13020. Epub 2016 Nov 1. PMID:27803324 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Proteopedia Page Contributors and Editors (what is this?)

OCA