Transcription factor E4TF1 contains two subunits with different functions.

H Watanabe; T Wada; H Handa

doi:10.1002/j.1460-2075.1990.tb08181.x

Home/Archive/PubMed

PubMed · 2311585

Transcription factor E4TF1 contains two subunits with different functions.

H Watanabe·T Wada·H Handa

View original source ↗Export metadata ↓

Abstract

The transcription factor E4TF1 stimulates transcription from the adenovirus early region 4 promoter by binding to a specific promoter element. E4TF1 has been purified to homogeneity from HeLa cells by sequence-specific DNA affinity chromatography and characterized. E4TF1 is composed of at least two distinct subunits identified as 60 kd and 53 kd polypeptides. The 60 kd protein alone is able to bind to the specific DNA sequence but not to stimulate transcription in vitro. The 53 kd protein alone neither binds to DNA nor stimulates transcription in vitro. However, the 53 kd protein is able to interact with the 60 kd protein and the interaction confers the ability to stimulate transcription in vitro and to increase the DNA binding affinity of the 60 kd protein. This study provides evidence that the interaction between the two different subunits of E4TF1 is required for it to function as a transcription factor, and that one of the subunits binds to a specific DNA sequence and the other works as a modulator.

Explore related subjects

Base Sequence Cell Nucleus Chromatography, Affinity Electrophoresis, Polyacrylamide Gel HeLa Cells Humans Macromolecular Substances Molecular Sequence Data Molecular Weight Oligonucleotide Probes Plasmids Transcription Factors Transcription, Genetic Journal Article Research Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

H Watanabe, T Wada, H Handa. 1990. Transcription factor E4TF1 contains two subunits with different functions.. https://doi.org/10.1002/j.1460-2075.1990.tb08181.x

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2016

miR-503-3p promotes epithelial-mesenchymal transition in breast cancer by directly targeting SMAD2 and E-cadherin.

Although progress in clinical and basic research has significantly increased our understanding of breast cancer, little is known about the molecular mechanism underlying breast cancer metastasis. Identification of effective therapeutic targets to prevent breast cancer metastasis is urgently needed. The function of miR-503-3p has been investigated in other cancers, but its role in breast cancer remains undefined. Here, we found that miR-503-3p was overexpressed in breast cancer tissue and plasma compared with adjacent normal breast tissue and with plasma from healthy individuals. Moreover, we identified miR-503-3p to be an oncogene of breast cancer cell proliferation, migration and invasion. Upregulation of miR-503-3p in breast cancer cells inhibited expression of epithelial-mesenchymal transition (EMT)-related protein SMAD2 and the epithelial marker protein E-cadherin by directly binding to their mRNA 3' untranslated region, whereas increased expression of mesenchymal marker proteins, including vimentin and N-cadherin. Taken together, our findings support a critical role for miR-503-3p in induction of breast cancer EMT and suggest that plasma miR-503-3p may be a useful diagnostic biomarker for breast cancer.

Base Sequence↗

PubMed2007

Highly sensitive detection of cytotoxicity using a modified HSP70B' promoter.

We have previously found that the DNA fragment from nucleotides (nts) -287 to +110 in the HSP70B' gene is a functional promoter responding to Cadmium Chloride-induced cytotoxicity (Wada et al., Biotechnol Bioeng, 92, 410-415, 2005). In order to increase the cytotoxic response of this promoter, we first determined the location of the cytotoxic responding element (CRE) and then constructed tandem repeats of the CRE in front of the HSP70B' promoter. 5'- and 3'-deletion analysis revealed that the DNA fragment from nts -192 to -56 in the HSP70B' gene induces a significant response to cytotoxicity. When the AP-1 binding site in this region was mutated, the basal activity of HSP70B' gene promoter decreased but the cytotoxic response was unchanged. Thus, the CRE is located in nts -192 to -56 in the HSP70B' promoter, and the AP-1 binding site is not essential for the cytotoxic response. In addition, cells transfected with a luciferase construct carrying three tandem repeats of the CRE upstream of the HSP70B' promoter and containing AP-1 binding site mutation, showed a 2.28-fold higher response than that of no repeats. Moreover, the detection limit of Cadmium Chloride in the cells was 382 pmol/mL. Thus, highly sensitive sensor cells for Cadmium Chloride can be constructed using a HSP70B' promoter construct containing upstream tandem repeats of the CRE and mutation of the AP-1 binding site.

Base Sequence↗

PubMed2007

Synaptotagmin XI as a candidate gene for susceptibility to schizophrenia.

Synaptotagmin XI (Syt11) is a member of the synaptotagmin family, which is localized in cells either in synaptic vesicles or the cellular membrane, and is known to act as a calcium sensor. The Syt11 gene is located on chromosome locus 1q21-q22, which was previously reported as a major susceptibility locus of familial schizophrenia. Here, we present evidence for an association between the number of 33-bp repeats in the promoter region of the Syt11 gene and schizophrenia. We found that the transcriptional activity of the gene is affected by the number of 33-bp repeats, which include an Sp1 binding site, suggesting that the excessive expression of Syt11 can be associated with schizophrenia. Another (single nucleotide) polymorphism in the Syt11 5'UTR region, where the potent transcription factor YY1 can bind, also affects the transcriptional activity of Syt11.

Base Sequence↗