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The TPR- and J-domain-containing proteins DJC31 and DJC62 are involved in abiotic stress responses in Arabidopsis thaliana.
Dittmer, Sophie; Kleine, Tatjana; Schwenkert, Serena.
  • Dittmer S; Department Biologie I, Botanik , Ludwig-Maximilians-Universität, Großhaderner Strasse. 2-4, 82152 Planegg-Martinsried, Germany.
  • Kleine T; Department Biologie I, Botanik , Ludwig-Maximilians-Universität, Großhaderner Strasse. 2-4, 82152 Planegg-Martinsried, Germany.
  • Schwenkert S; Department Biologie I, Botanik , Ludwig-Maximilians-Universität, Großhaderner Strasse. 2-4, 82152 Planegg-Martinsried, Germany.
J Cell Sci ; 134(19)2021 10 01.
Article in English | MEDLINE | ID: covidwho-1484823
ABSTRACT
Molecular chaperones play an important role during the response to different stresses. Since plants are sessile organisms, they need to be able to adapt quickly to different conditions. To do so, plants possess a complex chaperone machinery, composed of HSP70, HSP90, J proteins and other factors. In this study we characterized DJC31 (also known as TPR16) and DJC62 (also known as TPR15) of Arabidopsis thaliana, two J proteins that additionally carry clamp-type tetratricopeptide repeat domains. Using cell fractionation and split GFP, we could show that both proteins are attached to the cytosolic side of the endoplasmic reticulum membrane. Moreover, an interaction with cytosolic HSP70.1 and HSP90.2 could be shown using bimolecular fluorescence complementation. Knockout of both DJC31 and DJC62 caused severe defects in growth and development, which affected almost all organs. Furthermore, it could be shown that the double mutant is more sensitive to osmotic stress and treatment with abscisic acid, but surprisingly exhibited enhanced tolerance to drought. Taken together, these findings indicate that DJC31 and DJC62 might act as important regulators of chaperone-dependent signaling pathways involved in plant development and stress responses.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Arabidopsis / Arabidopsis Proteins Type of study: Diagnostic study Language: English Year: 2021 Document Type: Article Affiliation country: Jcs.259032

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Arabidopsis / Arabidopsis Proteins Type of study: Diagnostic study Language: English Year: 2021 Document Type: Article Affiliation country: Jcs.259032