Abstract:
:A system for the controlled expression of a foreign gene in cultured tobacco cells (Nicotiana tabacum, BY2) by temperature shift was constructed. A 925-base-pair (bp) DNA fragment containing the 5'-flanking region of a low-molecular-mass heat-shock protein gene (HSP18.2) of Arabidopsis thaliana was inserted upstream of the beta-glucuronidase reporter gene (GUS). The resulting HSP18.2-GUS construct was introduced into BY2 cells by electroporation or Agrobacterium-mediated transformation. Transient expression of the HSP18.2 promoter in protoplasts was very low regardless of the heat shock. Although expression of the HSP18.2-GUS chimeric gene in the stable transformants of BY2 was hardly detected in culture at 25 degrees C, the expression increased rapidly on the transcriptional level when the incubation temperature was shifted to 35-37 degrees C. The optimal temperature for heat-shock induction was 37 degrees C. After a 2-h incubation at 37 degrees C, GUS activity was about 1000-fold greater than that before heat shock. The amount of GUS mRNA was maximum 2 h after heat shock, and then decreased gradually.
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Yoshida K,Kasai T,Garcia MR,Sawada S,Shoji T,Shimizu S,Yamazaki K,Komeda Y,Shinmyo Adoi
10.1007/BF00169945subject
Has Abstractpub_date
1995-12-01 00:00:00pages
466-72issue
3-4eissn
0175-7598issn
1432-0614journal_volume
44pub_type
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