p300 functions as a transcriptional coactivator for the TAL1/SCL oncoprotein.

Abstract:

:Activation of the TAL1 (or SCL) gene, originally identified through its involvement by a recurrent chromosomal translocation, is the most frequent gain-of-function mutation recognized in T-cell acute lymphoblastic leukemia (T-ALL). The TAL1 proteins contain a basic helix - loop - helix (bHLH) motif characteristic of a large family of transcription factors that control transcription from an E box target element as heterodimers with the E2A- and HEB-encoded gene products. Gene knockout studies in mice indicate that this transcription factor is required for embryonic and adult hematopoiesis, and considerable evidence suggests it has specific functions in terminal erythroid differentiation. We investigated whether the broadly expressed nuclear protein p300, known to function as a coactivator for other bHLH proteins involved in cellular differentiation, also interacts with TAL1. p300 was found to coimmunoprecipitate with Tal1 in extracts from murine erythroleukemia (MEL) cells induced to differentiate with dimethylsulfoxide (DMSO), and p300 and Tal1 were observed in a common E box DNA-binding complex in extracts from differentiating MEL cells. p300 also interacted with Tal1 in protein pulldown assays, suggesting this was a direct interaction. Finally, p300 augmented transcription by Tal1 from an E box-containing promoter and by a GAL4-Tal1 fusion from a promoter containing the GAL4 DNA-binding element. Deletion analysis identified the bHLH domain of Tal1 and amino-terminal sequences of p300 as necessary for p300-stimulated transactivation and Tal1-p300 interaction in vitro. These results indicate that recruitment of the transcriptional coactivator p300 can positively regulate TAL1-directed gene expression. The dependence of their interaction in MEL cells on addition of a differentiation inducer suggests, further, that this TAL1-p300 complex may have an important role in terminal erythroid differentiation.

journal_name

Oncogene

journal_title

Oncogene

authors

Huang S,Qiu Y,Stein RW,Brandt SJ

doi

10.1038/sj.onc.1202889

subject

Has Abstract

pub_date

1999-09-02 00:00:00

pages

4958-67

issue

35

eissn

0950-9232

issn

1476-5594

journal_volume

18

pub_type

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