HDX reveals the conformational dynamics of DNA sequence specific VDR co-activator interactions

Jie Zheng, Mi Ra Chang, Ryan E. Stites, Yong Wang, John B. Bruning, Bruce D. Pascal, Scott J. Novick, Ruben D. Garcia-Ordonez, Keith R. Stayrook, Michael J. Chalmers, Jeffrey A. Dodge and Patrick R. Griffin ()
Additional contact information
Jie Zheng: The Scripps Research Institute
Mi Ra Chang: The Scripps Research Institute
Ryan E. Stites: Eli Lilly and Company
Yong Wang: Eli Lilly and Company
John B. Bruning: The University of Adelaide, Institute for Photonics & Advanced Sensing (IPAS), School of Biological Sciences, University of Adelaide
Bruce D. Pascal: The Scripps Research Institute
Scott J. Novick: The Scripps Research Institute
Ruben D. Garcia-Ordonez: The Scripps Research Institute
Keith R. Stayrook: Eli Lilly and Company
Michael J. Chalmers: Eli Lilly and Company
Jeffrey A. Dodge: Eli Lilly and Company
Patrick R. Griffin: The Scripps Research Institute

Nature Communications, 2017, vol. 8, issue 1, 1-13

Abstract: Abstract The vitamin D receptor/retinoid X receptor-α heterodimer (VDRRXRα) regulates bone mineralization via transcriptional control of osteocalcin (BGLAP) gene and is the receptor for 1α,25-dihydroxyvitamin D3 (1,25D3). However, supra-physiological levels of 1,25D3 activates the calcium-regulating gene TRPV6 leading to hypercalcemia. An approach to attenuate this adverse effect is to develop selective VDR modulators (VDRMs) that differentially activate BGLAP but not TRPV6. Here we present structural insight for the action of a VDRM compared with agonists by employing hydrogen/deuterium exchange. Agonist binding directs crosstalk between co-receptors upon DNA binding, stabilizing the activation function 2 (AF2) surfaces of both receptors driving steroid receptor co-activator-1 (SRC1) interaction. In contrast, AF2 of VDR within VDRM:BGLAP bound heterodimer is more vulnerable for large stabilization upon SRC1 interaction compared with VDRM:TRPV6 bound heterodimer. These results reveal that the combination of ligand structure and DNA sequence tailor the transcriptional activity of VDR toward specific target genes.

Date: 2017
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DOI: 10.1038/s41467-017-00978-7

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