This gene product belongs to the nuclear receptor superfamily, members of which are transcription factors characterized by a ligand-binding domain and a DNA-binding domain. The encoded protein is a transcriptional regulator of the cytochrome P450 gene CYP3A4, binding to the response element of the CYP3A4 promoter as a heterodimer with the 9-cis retinoic acid receptor RXR. It is activated by a range of compounds that induce CYP3A4, including dexamethasone and rifampicin. Several alternatively spliced transcripts encoding different isoforms, some of which use non-AUG translation initiation codon, have been described for this gene. Additional transcript variants exist, however, they have not been fully characterized.
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Protein Aliases: Nuclear receptor subfamily 1 group I member 2; nuclear receptor subfamily 1, group 1, member 2; nuclear receptor subfamily 1, group I, member 2; ONR 1; Orphan nuclear receptor PAR1; Orphan nuclear receptor PXR; PAR 1; PAR 2; PAR q; pregnane X nuclear receptor variant 2; Pregnane X receptor; pregnane X receptor (nuclear receptor sub family 1, group I, member 2); Steroid and xenobiotic receptor; SXR
Gene Aliases: BXR; mPXR; NR1I2; ONR1; PAR; PAR1; PAR2; PARq; PRR; PXR; PXR.1; PXR.2; PXR1; SAR; SXR