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. 1989 Oct;9(10):4265–4271. doi: 10.1128/mcb.9.10.4265

Novel regulation of transcription initiation of the peptide IX gene of adenovirus 2.

T Matsui 1
PMCID: PMC362506  PMID: 2586514

Abstract

cis-Acting elements involved in transcription of the peptide IX (pIX) gene of adenovirus 2 were identified by using in vivo transient expression assays and two in vitro transcription systems. Deletion of either the sequence between positions -45 and -70 or the TATA box abolished the initiation of pIX gene transcription in vivo and transcription with HeLa cell nuclear extracts in vitro. These results initially suggested the presence of a positive factor acting on the upstream element. However, when proteins in the nuclear extract were fractionated by column chromatography and analyzed by reconstitution of transcription in vitro, it was found that a certain fraction could direct TATA box-dependent transcription initiation even in the absence of the upstream element. Furthermore, activity inhibiting TATA box-dependent transcription was found in the nuclear extract. In contrast, inhibition of TATA box-dependent transcription was suppressed by deletion of a downstream sequence between positions +33 and +122. These results indicate that the TATA box of the pIX gene by itself has the ability to direct initiation of constitutive transcription but that the function of this element is under negative control by a repressor acting on a downstream sequence. Thus, the upstream element of the pIX gene appears to have a novel function: suppression of the transcriptional repression exerted by a downstream sequence, leading to a net transcription activation. Possible mechanisms for transcription initiation of pIX DNA are discussed.

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