Anti-Vitamin D receptor Antibody, clone 9A7 clone 9A7, from rat

Vitamin D3 receptor (UniProt: O42392; also known as VDR, 1,25-dihydroxyvitamin D3 receptor, Nuclear receptor subfamily 1 group I member 1) is encoded by the VDR (also known as NR1I1) gene (Gene ID: 395988) in chicken. VDR is a nuclear receptor for calcitriol, the active form of vitamin D3 that mediates the action of vitamin D on cells. VDR is expressed mainly in kidney and intestine and plays a central role in calcium homeostasis. In the absence of bound vitamin D3 it is present as a homodimer and it enters the nucleus upon vitamin D3 binding where it forms heterodimers with the retinoid X receptor/RXR. The VDR-RXR heterodimers bind to specific response elements on DNA and activate the transcription of vitamin D3-responsive target genes. It is recruited to promoters via its interaction with BAZ1B/WSTF, which mediates the interaction with acetylated histones that is considered to be an essential step for VDR-promoter association. Plays a central role in calcium homeostasis. VDR is composed of three domains: a modulating N-terminal domain, a DNA-binding domain, and a C-terminal ligand-binding domain. Two isoforms of VDR have been described that are produced by alternative initiation.