Factors involved in specific transcription by human RNA polymerase II: analysis by a rapid and quantitative in vitro assay.
AUTOR(ES)
Sawadogo, M
RESUMO
We describe a new assay system that allows a rapid, direct, and quantitative detection of promoter-dependent in vitro transcription by RNA polymerase II. The template used is a hybrid plasmid containing the adenovirus major late promoter linked to a synthetic 400-base-pair DNA fragment that lacks cytidine residues on the transcribed strand--i.e., generates a transcript with no guanosine residues. In vitro transcriptions are carried out in the absence of GTP or, if the reactions contain GTP, in the presence of RNase T1 and the chain terminator 3'-0-methyl-GTP. Under these conditions the only RNAs that can accumulate, whether from a circular or linearized DNA template, are the 400-nucleotide RNase T1-resistant transcripts resulting from accurate initiation at the major late promoter. Thus, specific transcription can be directly monitored by conventional RNA quantitation methods. Using this fast assay, we show that three basic transcription factors, TFIIB, TFIID, and TFIIE, are absolutely required, in addition to the RNA polymerase II, for specific transcription initiation from the adenovirus major late promoter. Units of activity can be defined for each of these individual components. The applicability of this kind of assay to other systems is discussed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=390420Documentos Relacionados
- Factors involved in specific transcription by mammalian RNA polymerase II: identification of general transcription factor TFIIG.
- Factors involved in specific transcription by mammalian RNA polymerase II: purification and characterization of general transcription factor TFIIE.
- Factors involved in specific transcription by mammalian RNA polymerase II: purification and analysis of transcription factor IIA and identification of transcription factor IIJ.
- Factors involved in specific transcription by mammalian RNA polymerase II: role of transcription factors IIA, IID, and IIB during formation of a transcription-competent complex.
- Factors involved in specific transcription by mammalian RNA polymerase II: purification, genetic specificity, and TATA box-promoter interactions of TFIID.
