Abstract:
:We have previously shown that transcription of the Xenopus U6 snRNA gene by RNA polymerase III is stimulated in injected Xenopus oocytes by an activator element termed the DSE, which contains an octamer sequence. Data presented here reveal that the DSE contains, in addition, a GC-rich sequence capable of binding Sp1. Both elements are required to obtain wild-type levels of U6 transcription in vivo. The Xenopus U6 DSE exhibits optimal activation properties only when positioned at its normal location upstream from the start site. The U6 Sp1 motif binds the mammalian Sp1 transcriptional activator independently of the Oct-1 protein in vitro. Those mutations that lead to a reduced transcription level in vivo abolish the binding of Sp1 in vitro. Thus, transcriptional stimulation through the Xenopus U6 Sp1 motif is likely to be mediated by a protein with DNA-binding specificity identical to mammalian Sp1. These findings support the notion that RNA polymerase II and III transcription complexes share transactivators.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Lescure A,Tebb G,Mattaj IW,Krol A,Carbon Pdoi
10.1016/0022-2836(92)90828-8keywords:
subject
Has Abstractpub_date
1992-11-20 00:00:00pages
387-94issue
2eissn
0022-2836issn
1089-8638pii
0022-2836(92)90828-8journal_volume
228pub_type
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