Entrez Summary: This gene encodes a basic helix-loop-helix transcription factor belonging to the PAS (PER, ARNT, SIM) superfamily. The PAS proteins play important roles in adaptation to low atmospheric and cellular oxygen levels, exposure to certain environmental pollutants, and diurnal oscillations in light and temperature. This protein forms a transcriptionally active heterodimer with the circadian CLOCK protein, the structurally related MOP4, and hypoxia-inducible factors, such as HIF1alpha. Consistent with its role as a biologically relevant partner of circadian and hypoxia factors, this protein is coexpressed in regions of the brain such as the thalamus, hypothalamus, and amygdala. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Oct 2011].
UniProt Summary: N/A
Pfam DomainsGO Terms
Pfam Domains
PAS
PAS 3
HLH
GO Terms
positive regulation of circadian rhythm
entrainment of circadian clock
E-box binding
regulation of circadian rhythm
circadian rhythm
protein dimerization activity
transcription factor complex
rhythmic process
RNA polymerase II proximal promoter sequence-specific DNA binding
DNA-binding transcription factor activity
nucleolus
positive regulation of transcription by RNA polymerase II
positive regulation of transcription, DNA-templated