Exportin-4 coordinates nuclear shuttling of TOPLESS family transcription corepressors to regulate plant immunity

The regulated nucleocytoplasmic exchange of macromolecules is essential for the eukaryotic cell. However, nuclear transport pathways defined by different nuclear transport receptors (NTRs), including importins and exportins, and their significance in activating distinct stress responses are poorly u...

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Published inThe Plant cell Vol. 33; no. 3; pp. 697 - 713
Main Authors Xu, Feifei, Jia, Min, Li, Xin, Tang, Yu, Jiang, Keni, Bao, Jinsong, Gu, Yangnan
Format Journal Article
LanguageEnglish
Published England 05.05.2021
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Abstract The regulated nucleocytoplasmic exchange of macromolecules is essential for the eukaryotic cell. However, nuclear transport pathways defined by different nuclear transport receptors (NTRs), including importins and exportins, and their significance in activating distinct stress responses are poorly understood in plants. Here, we exploited a CRISPR/Cas9-based genetic screen to search for modifiers of CONSTITUTIVE EXPRESSION OF PATHOGENESIS-RELATED GENE 5 (cpr5), an Arabidopsis thaliana nucleoporin mutant that activates autoimmune responses that partially mimic effector-triggered immunity (ETI). We identified an NTR gene, Exportin-4 (XPO4), as a genetic interactor of CPR5. The xpo4 cpr5 double mutant activates catastrophic immune responses, which leads to seedling lethality. By leveraging the newly developed proximity-labeling proteomics, we profiled XPO4 substrates and identified TOPLESS (TPL) and TPL-related (TPR) transcription corepressors as XPO4-specific cargo. TPL/TPRs target negative regulators of immunity and are redundantly required for ETI induction. We found that loss-of-XPO4 promotes the nuclear accumulation of TPL/TPRs in the presence of elevated salicylic acid (SA), which contributes to the SA-mediated defense amplification and potentiates immune induction in the cpr5 mutant. We showed that TPL and TPRs are required for the enhanced immune activation observed in xpo4 cpr5 but not for the cpr5 single-mutant phenotype, underscoring the functional interplay between XPO4 and TPL/TPRs and its importance in cpr5-dependent immune induction. We propose that XPO4 coordinates the nuclear accumulation of TPL/TPRs, which plays a role in regulating SA-mediated defense feedback to modulate immune strength downstream of CPR5 during ETI induction.
AbstractList Abstract The regulated nucleocytoplasmic exchange of macromolecules is essential for the eukaryotic cell. However, nuclear transport pathways defined by different nuclear transport receptors (NTRs), including importins and exportins, and their significance in activating distinct stress responses are poorly understood in plants. Here, we exploited a CRISPR/Cas9-based genetic screen to search for modifiers of CONSTITUTIVE EXPRESSION OF PATHOGENESIS-RELATED GENE 5 (cpr5), an Arabidopsis thaliana nucleoporin mutant that activates autoimmune responses that partially mimic effector-triggered immunity (ETI). We identified an NTR gene, Exportin-4 (XPO4), as a genetic interactor of CPR5. The xpo4 cpr5 double mutant activates catastrophic immune responses, which leads to seedling lethality. By leveraging the newly developed proximity-labeling proteomics, we profiled XPO4 substrates and identified TOPLESS (TPL) and TPL-related (TPR) transcription corepressors as XPO4-specific cargo. TPL/TPRs target negative regulators of immunity and are redundantly required for ETI induction. We found that loss-of-XPO4 promotes the nuclear accumulation of TPL/TPRs in the presence of elevated salicylic acid (SA), which contributes to the SA-mediated defense amplification and potentiates immune induction in the cpr5 mutant. We showed that TPL and TPRs are required for the enhanced immune activation observed in xpo4 cpr5 but not for the cpr5 single-mutant phenotype, underscoring the functional interplay between XPO4 and TPL/TPRs and its importance in cpr5-dependent immune induction. We propose that XPO4 coordinates the nuclear accumulation of TPL/TPRs, which plays a role in regulating SA-mediated defense feedback to modulate immune strength downstream of CPR5 during ETI induction.
The regulated nucleocytoplasmic exchange of macromolecules is essential for the eukaryotic cell. However, nuclear transport pathways defined by different nuclear transport receptors (NTRs), including importins and exportins, and their significance in activating distinct stress responses are poorly understood in plants. Here, we exploited a CRISPR/Cas9-based genetic screen to search for modifiers of CONSTITUTIVE EXPRESSION OF PATHOGENESIS-RELATED GENE 5 (cpr5), an Arabidopsis thaliana nucleoporin mutant that activates autoimmune responses that partially mimic effector-triggered immunity (ETI). We identified an NTR gene, Exportin-4 (XPO4), as a genetic interactor of CPR5. The xpo4 cpr5 double mutant activates catastrophic immune responses, which leads to seedling lethality. By leveraging the newly developed proximity-labeling proteomics, we profiled XPO4 substrates and identified TOPLESS (TPL) and TPL-related (TPR) transcription corepressors as XPO4-specific cargo. TPL/TPRs target negative regulators of immunity and are redundantly required for ETI induction. We found that loss-of-XPO4 promotes the nuclear accumulation of TPL/TPRs in the presence of elevated salicylic acid (SA), which contributes to the SA-mediated defense amplification and potentiates immune induction in the cpr5 mutant. We showed that TPL and TPRs are required for the enhanced immune activation observed in xpo4 cpr5 but not for the cpr5 single-mutant phenotype, underscoring the functional interplay between XPO4 and TPL/TPRs and its importance in cpr5-dependent immune induction. We propose that XPO4 coordinates the nuclear accumulation of TPL/TPRs, which plays a role in regulating SA-mediated defense feedback to modulate immune strength downstream of CPR5 during ETI induction.
Author Tang, Yu
Bao, Jinsong
Xu, Feifei
Jia, Min
Jiang, Keni
Li, Xin
Gu, Yangnan
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Snippet The regulated nucleocytoplasmic exchange of macromolecules is essential for the eukaryotic cell. However, nuclear transport pathways defined by different...
Abstract The regulated nucleocytoplasmic exchange of macromolecules is essential for the eukaryotic cell. However, nuclear transport pathways defined by...
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Title Exportin-4 coordinates nuclear shuttling of TOPLESS family transcription corepressors to regulate plant immunity
URI https://www.ncbi.nlm.nih.gov/pubmed/33793858
https://search.proquest.com/docview/2522621409
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