Arabidopsis Class A and B HSFs Show a Spectrum of Transcriptional Activity
Committee on Biotechnology PAS ; Institute of Bioorganic Chemistry PAS
A plethora of heat shock transcription factors (HSFs) has been obtainedfrom various plant species (33,45-48,50,51). The Arabidopsis genome sequencingproject provided confirmation of the existence of at least twenty one HSFswhich were classified into three major classes. A, B and C, and numerous subclasses (9). Members of HSF class A displayed differential transcriptional activities in tobacco protoplasts that varied from 15- to 50-fold above the controllevel. This diversity of activity levels may reflect HSF variations regarding theirtranscriptional activation functions- some of the members might be the majorheat inducible HSFs (class A1 HSFs), while others act in an auxiliary capacity asHSF activity boosters (38). Two new class B HSFs showed no transcriptional activation potential. Reporter activities due to endogenous tobacco HSFs were inhibited by a class B HSFs showing high expression levels. This suppression ofendogenous HSFs by class B members provides further evidence that class BHSFs are not transcriptional activators, but are able to trons-attenuate thetranscriptional activity of bona fide activator HSFs (34,41). The transcriptionalcompetency of class C HSFs has not been determined.
Biotechnologia, vol.58, 3 (2002)-.
0860-7796 ; oai:rcin.org.pl:137866 ; IChB B-54
Library of Institute of Bioorganic Chemistry PAS
Creative Commons Attribution BY-SA 4.0 license
Institute of Bioorganic Chemistry of the Polish Academy of Science
Institute of Bioorganic Chemistry of the Polish Academy of Science
Oct 2, 2020
Sep 4, 2020
58
https://rcin.org.pl./publication/172992
Edition name | Date |
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Arabidopsis Class A and B HSFs Show a Spectrum of Transcriptional Activity | Oct 2, 2020 |
Lawit, Shai J. Czarnecka-Verner, Eva
Borkowska, Bożenna
Ziółkowski, Piotr Babula- Skowrońska, Danuta Kaczmarek, Małgorzata Cieśla, Agata Sadowski, Jan
Czamecka-Vemer, Eva Gurley, William B.