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Mol. Cell. Biol., Aug 1997, 4220-4229, Vol 17, No. 8
JP Halle, P Haus-Seuffert, C Woltering, G Stelzer and M Meisterernst
The T-cell receptor (TCR) beta-chain promoters have been characterized as
nonstructured basal promoters that carry a single conserved ubiquitous
cyclic AMP-responsive element. Our investigation of the human TCR beta gene
uncovers a surprisingly complex and tissue-specific structure at the TCR
Vbeta 8.1 promoter. The core of the promoter (positions -42 to +11) is
recognized by the lymphoid cell-specific transcription factors Ets-1, LEF1,
and AML1 as well as by CREB/ATF-1, as is demonstrated in gel shift and
footprinting experiments. With the exception of LEF1, these factors
activate transcription in T cells. Binding sites at the core region show
little conservation with consensus sites. Nonetheless, CREB, Ets-1, and
AML1 bind and activate cooperatively and very efficiently through the
nonconsensus binding sites at the core promoter region. Moderate ubiquitous
activation is further induced by CREB/ATF and Sp1 factors through proximal
upstream elements. The tissue-specific core promoter structure is
apparently conserved in other T-cell-specifically expressed genes such as
the CD4 gene. Our observations suggest that both the enhancer and the
promoter have a complex tissue-specific structure whose functional
interplay potentiates T-cell-specific transcription.
Copyright © 1997, American Society for Microbiology
A conserved tissue-specific structure at a human T-cell receptor beta- chain core promoter
Laboratorium fur Molekulare Biologie-Genzentrum der Ludwig-Maximilians- Universitat Munchen, Munich, Germany.
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