XB-ART-5366
Mol Cell Biol
2003 May 01;2310:3392-404. doi: 10.1128/MCB.23.10.3392-3404.2003.
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Tax recruitment of CBP/p300, via the KIX domain, reveals a potent requirement for acetyltransferase activity that is chromatin dependent and histone tail independent.
Georges SA
,
Giebler HA
,
Cole PA
,
Luger K
,
Laybourn PJ
,
Nyborg JK
.
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Robust transcription of human T-cell leukemia virus type 1 (HTLV-1) genome requires the viral transactivator Tax. Although Tax has been previously shown to interact with the KIX domain of CBP/p300 in vitro, the precise functional relevance of this interaction remains unclear. Using two distinct approaches to interrupt the physical interaction between Tax and KIX, we find that Tax transactivation from chromatin templates is strongly dependent on CBP/p300 recruitment via the KIX domain. Additionally, we find that the primary functional contribution of CBP/p300 to Tax transactivation resides in the intrinsic acetyltransferase activity of the coactivators. These studies unexpectedly uncover a specific requirement for CBP/p300 acetyltransferase activity on chromatin templates assembled with nucleosomes lacking their amino-terminal tails. Together, these data indicate that the KIX domain of CBP/p300 is essential for targeting the acetyltransferase activity of the coactivator to the Tax-CREB (Tax/CREB) complex. Significantly, these observations reveal the presence of one or more CBP/p300 acetyltransferase targets that function specifically on chromatin templates, are independent of the histone tails, and are critical to Tax transactivation.
???displayArticle.pubmedLink??? 12724399
???displayArticle.pmcLink??? PMC164760
???displayArticle.link??? Mol Cell Biol
???displayArticle.grants??? [+]
CA 87540 NCI NIH HHS , GM 62437 NIGMS NIH HHS , R01 CA055035-10A1 NCI NIH HHS , CA 87540 NCI NIH HHS , R01 CA055035 NCI NIH HHS , R37 GM062437 NIGMS NIH HHS , R01 CA087540 NCI NIH HHS , R01 GM062437 NIGMS NIH HHS
Species referenced: Xenopus laevis
Genes referenced: creb1 crebbp ep300
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