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High resolution studies of the Xenopus laevis ribosomal gene promoter in vivo and in vitro

Research output: Contribution to journalArticle

  • Chris Read
  • Anne Marie Larose
  • Benoît Leblanc
  • Andrew J. Bannister
  • Simon Firek
  • Duncan R. Smith
  • Tom Moss

The first high resolution maps of the Xenopus laevis ribosomal promoter and its flanking regions (-179 to +14) have been created by assaying point mutants both in oocyte and in vitro. Within the promoter boundaries (-141(-145) to +3(+4)), domains analogous to the Core Promoter and "Upstream Control Element" (UCE) were clearly detected. The base pairs at -133, within the UCE, and -20, -10, -7, and +3, within the Core, were all shown to be especially important for promotion. Between the Core and UCE, two central promoter elements (CPEs) were also resolved. Surprisingly, these CPEs did not correspond to the highly conserved enhancer homology (∼-70 to -110), but to CCCGGCC motifs immediately flanking it. Although xUBF was shown to be a limiting component for in vitro transcription, none of the point mutations was found to affect the interaction of this factor with the promoter.

Original languageEnglish
Pages (from-to)10961-10967
Number of pages7
JournalJournal of Biological Chemistry
Volume267
Issue number16
Publication statusPublished - 5 Jun 1992

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