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Mol Cell Biol. 1987 August; 7(8): 2884-2890

Selective induction of human heat shock gene transcription by the adenovirus E1A gene products, including the 12S E1A product.

M C Simon, K Kitchener, H T Kao, E Hickey, L Weber, R Voellmy, N Heintz and J R Nevins

Laboratory of Molecular Cell Biology, Howard Hughes Medical Institute, Rockefeller University, New York, New York 10021.

ABSTRACT

We have previously shown that the human 70-kilodalton heat shock protein gene (hsp70) is induced by the adenovirus E1A gene product and during the S-G2 phase of the cell cycle. In this study, we investigated the effect of E1A on the expression of other human hsp genes. A gene encoding one form of the hsp89 protein (hsp89 alpha) was activated during an adenovirus infection with kinetics similar to those of activation of hsp70. The induction required a functional E1A gene. However, the hsp89 transcript was not cell cycle regulated. Genes encoding another form of hsp89 and the hsp27 protein were not induced by E1A or during the cell cycle. Further examination of hsp70 expression revealed a greater complexity than previously seen. S1 nuclease analysis using an hsp70 cDNA as well as a distinct hsp70 genomic clone demonstrated three related hsp70 transcripts; two were induced by E1A, and one was not. Both of the E1A-inducible genes were regulated during the cell cycle. All three were induced by heat shock. These results suggest common aspects of control among certain members of this family of cellular genes distinct from heat shock control. Finally, using viruses that express the individual E1A proteins, we found that the hsp70 gene is induced by the 12S and the 13S E1A products. The efficiency of induction by the 12S product was somewhat less than that by the 13S product but only by a factor of less than 2. This is in contrast to the induction of early viral genes, for which the 13S product is considerably more efficient than the 12S product.

Mol Cell Biol. 1987 August; 7(8): 2884-2890




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