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Poly(A) tail length of a heat shock protein RNA is increased by severe heat stress, but intron splicing is unaffected

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Abstract

The small heat shock proteins (sHSPs) are induced in all eukaryotes in response to high temperature stress, but are most abundant among members of the plant kingdom where they accumulate in multiple subcellular compartments. We have analyzed the expression of the chloroplast-localized sHSP from Arabidopsis thaliana, HSP21, and characterized the structure of the gene encoding this protein to facilitate future genetic studies on the function of HSP21 in the heat shock response. HSP21 is encoded in Arabidopsis by a single gene whose coding region is interrupted by a single intron. Previous studies have shown that intron processing is disrupted by severe, abrupt heat stress but is protected by pretreatments that induce thermotolerance. The processing of the HSP21 transcript was investigated in response to an abrupt heat stress regime and a gradual heat stress regime, the latter of which is known to confer thermotolerance in plants. Under abrupt stress conditions the HSP21 transcript is somewhat longer than under gradual heat stress conditions. However, the molecular basis for the size difference is not impaired intron splicing, but rather a difference in the length of the poly(A) tail depending on the heat stress regime. The results suggest that an increase in poly(A) tail length may be a generalized response to severe, abrupt heat stress and that poly(A) tail metabolism may be one of numerous cellular processes normally protected in thermotolerant cells from the otherwise damaging effects of high temperature stress.

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Authors and Affiliations

  1. Department of Biochemistry, University of Arizona, 85721, Tucson, AZ, USA

    Katherine W. Osteryoung, Holly Sundberg & Elizabeth Vierling

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  1. Katherine W. Osteryoung
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  2. Holly Sundberg
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  3. Elizabeth Vierling
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Communicated by E. Meyerowitz

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Osteryoung, K.W., Sundberg, H. & Vierling, E. Poly(A) tail length of a heat shock protein RNA is increased by severe heat stress, but intron splicing is unaffected. Molec. Gen. Genet. 239, 323–333 (1993). https://doi.org/10.1007/BF00276930

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  • DOI: https://doi.org/10.1007/BF00276930

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