Avides MDC, Sunkel CE, Moradas-Ferreira P, Rodrigues-Pousada C. Properties and partial characterization of the heat-shock factor from Tetrahymena pyriformis.
Eur J Biochem 1990;
194:331-6. [PMID:
2125266 DOI:
10.1111/j.1432-1033.1990.tb15621.x]
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Abstract
A heat-shock-factor-binding activity was identified in Tetrahymena pyriformis whole-cell extracts and was further purified by sequential heparin-agarose and sequence-specific oligonucleotide affinity chromatography. Tetrahymena heat-shock factor (HSF) was able to bind to the heat-shock elements (HSE) both before and after thermal stress, although heat shock altered both the HSE-binding affinity and the protein.DNA-complex mobility on polyacrylamide gels. The mobility difference was significantly reduced by treatment of the proteins with phosphatase. The HSE-binding proteins, isolated by oligonucleotide-affinity chromatography, migrated on SDS/polyacrylamide gels as a closely spaced doublet to about 70 kDa. Polypeptides with similar molecular mass were recovered from preparative band-shift gels indicating that both are components of the protein.DNA complex.
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