Pharmaceutical Sciences Faculty Publications
Analysis of Transcription Complexes and Effects of Ligands by Microelectrospray Ionization Mass Spectrometry
Document Type
Article
Publication Date
12-1-1999
Journal Title
Nature Biotechnology
ISSN
1087-0156
Volume
17
Issue
12
First Page
1214
Last Page
1218
DOI
10.1038/70767
PubMed ID
10585721
Abstract
The human vitamin D receptor (VDR) and retinoid X receptor-alpha (RXRalpha) modulate gene activity by forming homodimeric or heterodimeric complexes with specific DNA sequences and interaction with other elements of the transcriptional apparatus in the presence of their known endogenous ligands 1alpha,25-dihydroxyvitamin D3 (1, 25-[OH]2D3) and 9-cis-retinoic acid (9-c-RA). We used rapid buffer exchange gel filtration in conjunction with microelectrospray ionization mass spectrometry (microESI-MS) to study the binding of these receptors to the osteopontin vitamin D response element (OP VDRE). In the absence of DNA, both VDR and RXRalpha existed primarily as monomers, but in the presence of OP VDRE, homodimeric RXRalpha and heterodimeric RXRalpha-VDR complexes were shown to bind OP VDRE. Addition of 9-c-RA increased RXRalpha homodimer-OP VDRE complexes, and addition of 1,25-(OH) 2D3 resulted in formation of 1, 25-(OH)2D 3-VDR-RXRalpha-OP VDRE complexes. Addition of low-affinity binding ligands had no detectable effect on the VDR-RXRalpha-OP VDRE transcription complex. These results demonstrate the utility of microESI-MS in analyzing multimeric, high-molecular-weight protein-protein and protein-DNA complexes, and the effects of ligands on these transcriptional complexes.
Keywords
Base sequence, DNA primers, humans, ligands, mass spectrometry, receptors, calcitriol, retinoic acid, transcription factors, genetic
Recommended Citation
Craig, Theodore A.; Benson, Linda M.; Tomlinson, Andy J.; Veenstra, Timothy D.; Naylor, Stephen; and Kumar, Rajiv, "Analysis of Transcription Complexes and Effects of Ligands by Microelectrospray Ionization Mass Spectrometry" (1999). Pharmaceutical Sciences Faculty Publications. 537.
https://digitalcommons.cedarville.edu/pharmaceutical_sciences_publications/537