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. 2002 Nov 15;368(Pt 1):191–201. doi: 10.1042/BJ20020634

Transcriptional regulation of the human glycoprotein hormone common alpha subunit gene by cAMP-response-element-binding protein (CREB)-binding protein (CBP)/p300 and p53.

Xian Zhang 1, Roger J A Grand 1, Christopher J McCabe 1, Jayne A Franklyn 1, Phillip H Gallimore 1, Andrew S Turnell 1
PMCID: PMC1222971  PMID: 12164786

Abstract

We have investigated the functional interactions between adenovirus early region 1A (AdE1A) protein, the co-activators cAMP-response-element-binding protein (CREB)-binding protein (CBP)/p300 and SUG1, and the transcriptional repressor retinoblastoma (Rb) in mediating T3-dependent repression. Utilizing the human glycoprotein hormone common alpha-subunit (alpha-subunit) promoter and AdE1A mutants with selective binding capacity to these molecules we have determined an essential role for CBP/p300. In normal circumstances, wild-type 12 S AdE1A inhibited alpha-subunit activity. In contrast, adenovirus mutants that retain both the SUG1- and Rb-binding sites, but lack the CBP/p300-binding site, were unable to repress promoter activity. We have also identified a role for the tumour-suppressor gene product p53 in regulation of the alpha-subunit promoter. Akin to 12 S AdE1A, exogenous p53 expression repressed alpha-subunit activity. This function resided in the ability of p53 to interact with CBP/p300; an N-terminal mutant incapable of interacting with CBP/p300 did not inhibit alpha-subunit activity. Stabilization of endogenous p53 by UV irradiation also correlated positively with reduced alpha-subunit activity. Intriguingly, T3 stimulated endogenous p53 transcriptional activity, implicating p53 in T3-dependent signalling pathways. These data indicate that CBP/p300 and p53 are key regulators of alpha-subunit activity.

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Selected References

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