Interactions between extracellular signal-regulated protein kinase 1, 14-3-3epsilon, and heat shock factor 1 during stress

The Journal of Biological Chemistry
XiaoZhe WangS K Calderwood

Abstract

Cytoprotection during the heat shock response is a complex phenomenon involving multiple inducible mechanisms. We have examined the interaction of two key molecular components in the response, heat shock transcription factor 1 (HSF1) and extracellular signal regulated protein kinase (ERK). Whereas both HSF1 and ERK are required to protect cells against apoptosis, ERK activation is paradoxically antagonistic to trans-activation of hsp promoters by HSF1 and HSP accumulation during heat shock. We have found that the two pathways interact directly and that heat shock causes the physical association of ERK1 with HSF1, an interaction that promotes the kinase activity of ERK in heat-shocked cells. ERK activation results in the recruitment of the phosphoserine binding protein 14-3-3epsilon in a manner dependent on previous HSF1 phosphorylation by ERK. The effects of 14-3-3epsilon binding on HSF1 were complex, however, depending on extracellular conditions, in that HSF1-14-3-3 binding at 37 degrees C led to the cytoplasmic sequestration and repression of HSF1, whereas heat shock overrode these effects and caused quantitative nuclear localization of HSF1. Although the effects of 14-3-3epsilon binding to HSF1 were overridden acutely by st...Continue Reading

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