GO:0008434

Combining with calcitriol, the hormonally active form of vitamin D3, and transmitting the signal to the transcriptional machinery by interacting selectively and non-covalently with a specific DNA sequence in order to modulate transcription by RNA polymerase II. [CHEBI:17823, GOC:bf, GOC:signaling, PMID:16549446, PMID:17082781, Wikipedia:Calcitriol_receptor]