+検索条件
-Structure paper
タイトル | The flexibility of a homeodomain transcription factor heterodimer and its allosteric regulation by DNA binding. |
---|---|
ジャーナル・号・ページ | FEBS J, Vol. 283, Issue 16, Page 3134-3154, Year 2016 |
掲載日 | 2016年7月25日 |
![]() | Lisa Mathiasen / Erica Valentini / Stephane Boivin / Angela Cattaneo / Francesco Blasi / Dmitri I Svergun / Chiara Bruckmann / ![]() ![]() |
PubMed 要旨 | Transcription factors are known to modify the DNA that they bind. However, DNA can also serve as an allosteric ligand whose binding modifies the conformation of transcriptional regulators. Here, we ...Transcription factors are known to modify the DNA that they bind. However, DNA can also serve as an allosteric ligand whose binding modifies the conformation of transcriptional regulators. Here, we describe how heterodimer PBX1:PREP1, formed by proteins playing major roles in embryonic development and tumorigenesis, undergoes an allosteric transition upon DNA binding. We demonstrate through a number of biochemical and biophysical methods that PBX1:PREP1 exhibits a structural change upon DNA binding. Small-angle X-ray scattering (SAXS), circular dichroism (CD), isothermal titration calorimetry (ITC), and limited proteolysis demonstrate a different shape, α-helical content, thermodynamic behavior, and solution environment of the holo-complex (with DNA) compared to the apo-complex (without DNA). Given that PBX1 as such does not have a defined DNA selectivity, structural changes upon DNA binding become major factors in the function of the PBX1:PREP1 complex. The observed changes are mapped at both the amino- and carboxy-terminal regions of the two proteins thereby providing important insights to determine how PBX1:PREP1 dimer functions. データベース: Small-angle scattering data are available in SASBDB under accession numbers SASDAP7, SASDAQ7, and SASDAR7. |
![]() | ![]() ![]() |
手法 | SAS (X-ray synchrotron) |
構造データ | ![]() SASDAP7: ![]() SASDAR7: |
由来 |
|