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Modèles Insectes d’Immunité Innée
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1994
Meissner W, Wanandi I, Carbon P, Krol A, Seifart K H
Transcription factors required for the expression of Xenopus laevis selenocysteine tRNA in vitro Article de journal
Dans: Nucleic Acids Res, vol. 22, no. 4, p. 553-559, 1994, ISBN: 8127703, (0305-1048 Journal Article).
Résumé | Liens | BibTeX | Étiquettes: Amino Acid-Specific/*genetics Support, Animals Base Sequence DNA-Binding Proteins/*physiology Human Molecular Sequence Data Oligonucleotide Probes RNA, Genetic Xenopus laevis, Non-U.S. Gov't TATA Box Transcription Factors/*genetics Transcription, Transfer, Unité ARN
@article{,
title = {Transcription factors required for the expression of Xenopus laevis selenocysteine tRNA in vitro},
author = {W Meissner and I Wanandi and P Carbon and A Krol and K H Seifart},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8127703},
isbn = {8127703},
year = {1994},
date = {1994-01-01},
journal = {Nucleic Acids Res},
volume = {22},
number = {4},
pages = {553-559},
abstract = {It has previously been reported that transcription in vivo of the tRNA(Sec) gene requires three promoter elements, a PSE and a TATA-box upstream of the coding region which are functionally interchangeable with the U6 snRNA gene counterparts and an internal B-block, resembling that of classical tRNA genes (1). We have established an in vitro transcription system from HeLa cells in which three factors, which are either essential for or stimulate transcription were identified. Apart from the TATA-binding protein TBP, the PSE-binding protein PBP was found to be essentially required for expression of the gene. Depletion of PBP from cell extracts by PSE-oligonucleotides abolished tRNA(Sec) transcription, which could be reconstituted by readdition of partially purified PBP. Addition of increasing amounts of recombinant human TBP to an S100 extract stimulated transcription of the tRNA(Sec), the mouse U6 snRNA and the human Y3 genes, an effect which was not observed in the case of a TATA-less tRNA gene. Purified human TFIIA strongly stimulated tRNA(Sec) transcription in a fashion depending on the concentration of TBP. Surprisingly, partially purified TFIIIC was shown to be dispensable for transcription in vitro and unable to bind the B-block of this gene in vitro, although its sequence matches the consensus for this element. Collectively, these data suggest that the mechanism by which transcription complexes are formed on the tRNA(Sec) gene is dramatically different from that observed for classical tRNA genes and much more resembles that observed for externally controlled pol III genes.},
note = {0305-1048
Journal Article},
keywords = {Amino Acid-Specific/*genetics Support, Animals Base Sequence DNA-Binding Proteins/*physiology Human Molecular Sequence Data Oligonucleotide Probes RNA, Genetic Xenopus laevis, Non-U.S. Gov't TATA Box Transcription Factors/*genetics Transcription, Transfer, Unité ARN},
pubstate = {published},
tppubtype = {article}
}
It has previously been reported that transcription in vivo of the tRNA(Sec) gene requires three promoter elements, a PSE and a TATA-box upstream of the coding region which are functionally interchangeable with the U6 snRNA gene counterparts and an internal B-block, resembling that of classical tRNA genes (1). We have established an in vitro transcription system from HeLa cells in which three factors, which are either essential for or stimulate transcription were identified. Apart from the TATA-binding protein TBP, the PSE-binding protein PBP was found to be essentially required for expression of the gene. Depletion of PBP from cell extracts by PSE-oligonucleotides abolished tRNA(Sec) transcription, which could be reconstituted by readdition of partially purified PBP. Addition of increasing amounts of recombinant human TBP to an S100 extract stimulated transcription of the tRNA(Sec), the mouse U6 snRNA and the human Y3 genes, an effect which was not observed in the case of a TATA-less tRNA gene. Purified human TFIIA strongly stimulated tRNA(Sec) transcription in a fashion depending on the concentration of TBP. Surprisingly, partially purified TFIIIC was shown to be dispensable for transcription in vitro and unable to bind the B-block of this gene in vitro, although its sequence matches the consensus for this element. Collectively, these data suggest that the mechanism by which transcription complexes are formed on the tRNA(Sec) gene is dramatically different from that observed for classical tRNA genes and much more resembles that observed for externally controlled pol III genes.