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Molecular and General Genetics MGG

, Volume 231, Issue 2, pp 226–232 | Cite as

Synergistic effect of upstream sequences, CCAAT box elements, and HSE sequences for enhanced expression of chimaeric heat shock genes in transgenic tobacco

  • Mechthild Rieping
  • Fritz Schöffl
Article
  • 239 Downloads

Summary

The thermoregulated expression of the soybean heat shock (hs) gene Gmhsp17.3-B is regulated via the heat shock promoter elements (HSEs), but full promoter activity requires additional sequences located upstream of the HSE-containing region. Structural features within this putative enhancer region include a run of simple sequences which are also present upstream of HSE-like sequences of other soybean hs genes, and three perfect CCAAT box sequences located immediately upstream from the most distal HSE of the promoter. A series of heterologous and homologous promoter fusions linked to the chloramphenicol acetyl transferase (CAT) gene was constructed and examined in transgenic tobacco plants. The region containing the AT-rich domain of the 5′ flanking region was unable to direct transcription from the TATA box of a truncated ΔCaMV35S promoter. Heat-inducible CAT activity was detectable when additional sequences from the native promoter containing three CCAAT boxes and a single HSE were present in the constructions. Complete reconstitution of the native hs promoter/enhancer region increased hs specific CAT activities only very little, but deletion of CCAAT box sequences reduced CAT expression fivefold. Our results suggest that AT-rich sequences have a moderate effect on thermoinducible expression levels of the soybean heat shock gene and that CCAAT box sequences act cooporatively with HSEs to increase the hs promoter activity.

Key words

CCAAT box Heat shock element Enhancer Transgenic tobacco 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Mechthild Rieping
    • 1
  • Fritz Schöffl
    • 1
  1. 1.Department of GeneticsUniversity of TübingenTübingenGermany

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