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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Heat shock- regulated expression of calreticulin in retinal pigment epithelium.

Calreticulin is a major Ca2+ binding protein in the endoplasmic reticulum of non-muscle cells. In this report we show that calreticulin protein is strongly induced by heat shock. Activation and attenuation of the heat shock transcriptional response is caused by heat shock factor that binds to 5'-flanking sequences of heat shock responsive genes, the heat shock element. The smallest stretch of DNA that shows detectable binding of heat shock factor in vitro contains a two-sequence unit nGAAnnTTCn which exists in the 5'-flanking region of calreticulin DNA (5'-gGAAccCAGcgTTC-3'). The present data provide direct evidence that calreticulin expression can be modulated by heat shock. Thus, our results strengthen the hypothesis that calreticulin, in addition to its function as a cellular Ca2+ store, is a multifunctional protein which performs at least some of its functions from the lumen of the ER.[1]

References

  1. Heat shock-regulated expression of calreticulin in retinal pigment epithelium. Szewczenko-Pawlikowski, M., Dziak, E., McLaren, M.J., Michalak, M., Opas, M. Mol. Cell. Biochem. (1997) [Pubmed]
 
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