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  • Title: A pathogen-induced gene of barley encodes a HSP90 homologue showing striking similarity to vertebrate forms resident in the endoplasmic reticulum.
    Author: Walther-Larsen H, Brandt J, Collinge DB, Thordal-Christensen H.
    Journal: Plant Mol Biol; 1993 Mar; 21(6):1097-108. PubMed ID: 8490130.
    Abstract:
    The full-length nucleotide sequence of a barley (Hordeum vulgare L.) leaf mRNA, found to increase rapidly in amount during infection attempts by the powdery mildew fungus (Erysiphe graminis DC. ex Mérat), is reported. The mRNA encodes a polypeptide of 809 amino acid residues which, by sequence comparison, was identified as a member of the 90 kDa heat shock protein (HSP90) family. The encoded protein most resembles the endoplasmic reticulum (ER) resident HSP90 protein, the 94 kDa glucose-regulated protein (GRP94) of vertebrates, as it possesses both the characteristic N-terminal domain including a signal peptide sequence and the C-terminal ER retention signal (Lys-Asp-Glu-Leu). A transcript cross-hybridizing at high stringency accumulated rapidly in leaves upon heat shock treatment. Genomic DNA blot analysis indicated the presence of a family of related genes in the barley genome.
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