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Anticipating Endoplasmic Reticulum Stress. A Novel Early Response Before Pathogenesis-related Gene Induction

Overview
Journal Plant Cell
Specialties Biology
Cell Biology
Date 1999 Oct 16
PMID 10521523
Citations 46
Authors
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Abstract

When it is attacked by a pathogen, a plant produces a range of defense-related proteins. Many of these are synthesized by the rough endoplasmic reticulum (RER) to be secreted from the cell or deposited in vacuoles. Genes encoding endoplasmic reticulum (ER)-resident chaperones, such as the lumenal binding protein (BiP), are also induced under these conditions. Here, we show that BiP induction occurs systemically throughout the plant. Furthermore, this induction occurs rapidly and precedes expression of genes encoding pathogenesis-related (PR) proteins. The underlying signal transduction pathway was shown to be independent of the signaling molecule salicylic acid and the unfolded protein response pathway. In addition, BiP induction was independent of PR gene induction. Overproduction of BiP alone was not sufficient to cause induction of PR gene expression; however, limiting the amount of BiP in the ER lumen via superimposed ER stress inhibited the induction of PR gene expression. We propose that the induction of BiP expression during plant-pathogen interactions is required as an early response to support PR protein synthesis on the RER and that a novel signal transduction pathway exists to trigger this rapid response.

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