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The UBC27–AIRP3 Ubiquitination Complex Modulates ABA Signaling by Promoting the Degradation of ABI1 in Arabidopsis
Wenbo Pan, Baoying Lin, Xiaoyuan Yang, Lijing Liu, Ran Xia, Jigang Li, Yaorong Wu, and Qi Xie
PNAS
Abstract
Abscisic acid (ABA) is the key phytohormone in plant drought tolerance and stress adaptation. The clade A protein phosphatase 2Cs (PP2Cs) like ABI1 (ABA-INSENSITIVE 1) work as coreceptors of ABA and regulate multiple ABA responses. Ubiquitination of ABI1 has been proven to play important regulatory roles in ABA signaling. However, the specific ubiquitin conjugating enzyme (E2) involved is unknown. Here, we report that UBC27 is an active E2 that positively regulates ABA signaling and drought tolerance. UBC27 forms the E2-E3 pair with the drought regulator RING E3 ligase AIRP3. Both UBC27 and AIRP3 interact with ABI1 and affect the ubiquitination and degradation of ABI1. ABA activates the expression of UBC27, inhibits the proteasome degradation of UBC27, and enhances the interaction between UBC27 and ABI1 to increase its activity. These findings uncover a regulatory mechanism in ABA signaling and drought response and provide a further understanding of the plant ubiquitination system and ABA signaling pathway.
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论文编号: |
DOI:10.1073/pnas.2007366117 |
论文题目: |
The UBC27–AIRP3 Ubiquitination Complex Modulates ABA Signaling by Promoting the Degradation of ABI1 in Arabidopsis |
英文论文题目: |
The UBC27–AIRP3 Ubiquitination Complex Modulates ABA Signaling by Promoting the Degradation of ABI1 in Arabidopsis |
第一作者: |
Wenbo Pan, Baoying Lin, Xiaoyuan Yang, Lijing Liu, Ran Xia, Jigang Li, Yaorong Wu, and Qi Xie |
英文第一作者: |
Wenbo Pan, Baoying Lin, Xiaoyuan Yang, Lijing Liu, Ran Xia, Jigang Li, Yaorong Wu, and Qi Xie |
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2020-10-20 |
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摘要: |
Abscisic acid (ABA) is the key phytohormone in plant drought tolerance and stress adaptation. The clade A protein phosphatase 2Cs (PP2Cs) like ABI1 (ABA-INSENSITIVE 1) work as coreceptors of ABA and regulate multiple ABA responses. Ubiquitination of ABI1 has been proven to play important regulatory roles in ABA signaling. However, the specific ubiquitin conjugating enzyme (E2) involved is unknown. Here, we report that UBC27 is an active E2 that positively regulates ABA signaling and drought tolerance. UBC27 forms the E2-E3 pair with the drought regulator RING E3 ligase AIRP3. Both UBC27 and AIRP3 interact with ABI1 and affect the ubiquitination and degradation of ABI1. ABA activates the expression of UBC27, inhibits the proteasome degradation of UBC27, and enhances the interaction between UBC27 and ABI1 to increase its activity. These findings uncover a regulatory mechanism in ABA signaling and drought response and provide a further understanding of the plant ubiquitination system and ABA signaling pathway. |
英文摘要: |
Abscisic acid (ABA) is the key phytohormone in plant drought tolerance and stress adaptation. The clade A protein phosphatase 2Cs (PP2Cs) like ABI1 (ABA-INSENSITIVE 1) work as coreceptors of ABA and regulate multiple ABA responses. Ubiquitination of ABI1 has been proven to play important regulatory roles in ABA signaling. However, the specific ubiquitin conjugating enzyme (E2) involved is unknown. Here, we report that UBC27 is an active E2 that positively regulates ABA signaling and drought tolerance. UBC27 forms the E2-E3 pair with the drought regulator RING E3 ligase AIRP3. Both UBC27 and AIRP3 interact with ABI1 and affect the ubiquitination and degradation of ABI1. ABA activates the expression of UBC27, inhibits the proteasome degradation of UBC27, and enhances the interaction between UBC27 and ABI1 to increase its activity. These findings uncover a regulatory mechanism in ABA signaling and drought response and provide a further understanding of the plant ubiquitination system and ABA signaling pathway. |
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PNAS |
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PNAS |
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Wenbo Pan, Baoying Lin, Xiaoyuan Yang, Lijing Liu, Ran Xia, Jigang Li, Yaorong Wu, and Qi Xie. The UBC27–AIRP3 Ubiquitination Complex Modulates ABA Signaling by Promoting the Degradation of ABI1 in Arabidopsis. PNAS. DOI:10.1073/pnas.2007366117 |
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