A DNA replication-related element downstream from the initiation site of Drosophila selenophosphate synthetase 2 gene is essential for its transcription
AUTOR(ES)
Jin, Jing Shun
FONTE
Oxford University Press
RESUMO
Selenophosphate synthetase catalyzes the synthesis of selenophosphate which is a selenium donor for Sec biosynthesis. In Drosophila melanogaster, there are two types of selenophosphate synthetases designated dSPS1 and dSPS2, where dSPS2 is a selenoprotein. The mechanism of gene expression of dSPS2 as well as other selenoproteins in Drosophila has not been elucidated. Herein, we report an essential regulator system that regulates the transcription of the dSPS2 gene (dsps2). Through deletion/substitution mutagenesis, the downstream DNA replication-related element (DRE) located at +71 has been identified as an essential element for dsps2 promoter activity. Furthermore, double-stranded RNA interference (dsRNAi) experiments were performed to ablate transcription factors such as TBP, TRF1, TRF2 and DREF in Schneider cells. The dsRNAi experiments showed that dsps2 promoter activities in DREF- and TRF2-depleted cells were significantly decreased by 90% and 50%, respectively. However, the depletion of TBP or TRF1 did not affect the expression level of dsps2 even though there is a putative TATA box at –20. These results strongly suggest that the DRE/DREF system controls the basal level of transcription of dsps2 by interacting with TRF2.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=419457Documentos Relacionados
- Transcriptional regulation of the Drosophila CycA gene by the DNA replication-related element (DRE) and DRE binding factor (DREF).
- Transcriptional regulation of the Drosophila-raf proto-oncogene by the DNA replication-related element (DRE)/DRE-binding factor (DREF) system.
- The class 2 selenophosphate synthetase gene of Drosophila contains a functional mammalian-type SECIS
- An element downstream of the cap site is required for transcription of the gene encoding mouse ribosomal protein L32.
- c-mos expression in mouse oocytes is controlled by initiator-related sequences immediately downstream of the transcription initiation site.