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Tandem Affinity Purification and Nano HPLC-ESI-MS/MS Reveal Binding of Vitamin D Receptor to p53 and other New Interaction Partners in HEK 293T Cells.
Anticancer Research 2018 Februrary
While nuclear cofactors that contribute to vitamin D receptor (VDR)-mediated gene transcription, including retinoid X receptors, nuclear co-activators and co-repressors, have been extensively investigated, little is known about cytoplasmic VDR-binding partners and the physiological relevance of their interaction. To gain new insight into this topic, we isolated whole-cell protein extracts of 1,25-dihydroxyvitamin D3 stimulated and UV-B-irradiated vs. non-irradiated HEK 293T cells transfected with a plasmid called pURB VDR C-Term TAP tag. VDR complex was purified by tandem affinity purification (TAP). The nuclear tumor-suppressor protein p53 and its negative regulator novel INHAT repressor (NIR), in addition to 43 other nuclear or cytoplasmatic VDR binding partners, were identified using nano high-performance liquid chromatography-electrospray ionization tandem mass spectrometric analysis. VDR binding to p53 was confirmed by western blot analysis. Future studies are required to further elucidate the functional significance of these interactions.
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