Identification of an internal cis-element essential for the human L1 transcription and a nuclear factor(s) binding to the element.
AUTOR(ES)
Minakami, R
RESUMO
L1 (LINE-1) is a long interspersed repetitive sequence derived from a retrotransposon. Transfection studies using the CAT gene as a reporter demonstrated that the first 155bp in the human L1 sequence contains an element(s) responsible for the promoter activity in HeLa cells. The transcription was shown to initiate at the first nucleotide of the L1 sequence in the transgene. Three prominent nuclear protein binding sites were found in the 5' region of the L1 sequence by DNaseI footprint analysis. One of the binding sites, designated as site A located at +3 to +26, was shown to be essential for the L1 transcription because the mutation at the site A caused almost complete loss of the promoter activity. A sequence AAGATGGCC at +11 to +19 in the site A was defined as a target core element for the protein binding. The site A-binding protein (designated TFL1-A) was found in various types of cells including an embryonic teratocarcinoma cell line. These results indicate that an internal short element located at the very 5' terminal of L1 sequence and the nuclear factor binding to the element play a crucial role in the transcription of human L1.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=312450Documentos Relacionados
- Involvement of a cis-element that binds an H2TF-1/NF kappa B like factor(s) in the virus-induced interferon-beta gene expression.
- Activation of the CaMV as-1 cis-element by salicylic acid: differential DNA-binding of a factor related to TGA1a.
- Xenopus TFIIIA Gene Transcription Is Dependent on cis-Element Positioning and Chromatin Structure
- The Epstein-Barr virus nuclear antigen 2 interacts with an EBNA2 responsive cis-element of the terminal protein 1 gene promoter.
- Isolation and Functional Analysis of Arabidopsis Stress-Inducible NAC Transcription Factors That Bind to a Drought-Responsive cis-Element in the early responsive to dehydration stress 1 PromoterW⃞