RGD Reference Report - Maximal aryl hydrocarbon receptor activity depends on an interaction with the retinoblastoma protein. - Rat Genome Database

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Maximal aryl hydrocarbon receptor activity depends on an interaction with the retinoblastoma protein.

Authors: Elferink, CJ  Ge, NL  Levine, A 
Citation: Elferink CJ, etal., Mol Pharmacol. 2001 Apr;59(4):664-73.
RGD ID: 8554020
Pubmed: PMID:11259609   (View Abstract at PubMed)

The aryl hydrocarbon receptor (AhR) belongs to the basic helix-loop-helix/periodicity/AhR nuclear translocator/simple-minded (Per-Arnt-Sim) family of transcription factors that regulate critical functions during development and tissue homeostasis. Within this family, the AhR is the only member conditionally activated in response to ligand binding, typified by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). We recently demonstrated that the AhR interacts with the retinoblastoma protein (pRb). This report presents evidence that a LXCXE motif in the AhR protein confers pRb binding, which is necessary for maximal TCDD induced G(1) arrest in rat 5L hepatoma cells. The data support a mechanism whereby pRb seems to regulate G(1) cell cycle progression distinct from the direct repression of E2F-mediated transcription. Furthermore, the results indicate that the AhR-pRb interaction regulates TCDD induction of CYP1A1, suggesting that pRb may be a general AhR coactivator.




Molecular Function

  
Object Symbol
Species
Term
Qualifier
Evidence
With
Notes
Source
Original Reference(s)
AhrRatprotein binding enablesIPIUniProtKB:P41739PMID:11259609IntAct 
ArntRatprotein binding enablesIPIUniProtKB:P41738PMID:11259609IntAct 


Genes (Rattus norvegicus)
Ahr  (aryl hydrocarbon receptor) Arnt  (aryl hydrocarbon receptor nuclear translocator)