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Mol. Cell. Biol., 06 1995, 3354-3362, Vol 15, No. 6
M Green, TJ Schuetz, EK Sullivan and RE Kingston
Human heat shock factor 1 (HSF1) stimulates transcription from heat shock
protein genes following stress. We have used chimeric proteins containing
the GAL4 DNA binding domain to identify the transcriptional activation
domains of HSF1 and a separate domain that is capable of regulating
activation domain function. This regulatory domain conferred heat shock
inducibility to chimeric proteins containing the activation domains. The
regulatory domain is located between the transcriptional activation domains
and the DNA binding domain of HSF1 and is conserved between mammalian and
chicken HSF1 but is not found in HSF2 or HSF3. The regulatory domain was
found to be functionally homologous between chicken and human HSF1. This
domain does not affect DNA binding by the chimeric proteins and does not
contain any of the sequences previously postulated to regulate DNA binding
of HSF1. Thus, we suggest that activation of HSF1 by stress in humans is
controlled by two regulatory mechanisms that separately confer heat
shock-induced DNA binding and transcriptional stimulation.
Copyright © 1995, American Society for Microbiology
A heat shock-responsive domain of human HSF1 that regulates transcription activation domain function
Department of Molecular Biology, Massachusetts General Hospital, Boston 02114, USA.
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