Monitoring of the retinoic acid receptor-retinoid X receptor dimerization upon DNA binding by native mass spectrometry.
Fiche publication
Date publication
mars 2016
Journal
Biophysical chemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Dr ROCHEL-GUIBERTEAU Natacha, Dr OSZ-PAPAI Judit
Tous les auteurs :
Nguyen-Huynh NT, Osz J, Peluso-Iltis C, Rochel N, Potier N, Leize-Wagner E
Lien Pubmed
Résumé
Identifying protein-DNA interactions is essential to understand the regulatory networks of cells and their influence on gene expression. In this study, we use native electrospray mass spectrometry (ESI-MS) to investigate how the heterodimerization of retinoic acid receptor-retinoid X receptor (RAR-RXR) is mediated by DNA sequence. In presence of various RAR response elements (RAREs), three oligomeric states of RAR-RXR DNA binding domains (DBDs) bound to RAREs (monomer, homo- or heterodimers) were detected and individually monitored to follow subunit assembly and disassembly upon RAREs' abundancy or sequence. In particular, a cooperative heterodimerization was shown with RARb2 DR5 (5 base pair spaced direct repeat) while a high heterogeneity reflecting random complex formation could be observed with the DR0 response elements, in agreement with native gel electrophoresis data or molecular modeling. Such MS information will help to identify the composition of species formed in solution and to define which DR sequence is specific for RAR-RXR heterodimerization.
Mots clés
DNA, metabolism, Dimerization, Mass Spectrometry, methods, Models, Molecular, Receptors, Retinoic Acid, metabolism, Retinoid X Receptors, metabolism
Référence
Biophys. Chem.. 2016 Mar;210:2-8