Mitogen-activated protein kinase 6 negatively regulates secondary wall biosynthesis by modulating MYB46 protein stability in Arabidopsis thaliana
Abstract
The R2R3-MYB transcription factor MYB46 functions as a master switch for secondary cell wall biosynthesis, ensuring the exquisite expression of the secondary wall biosynthetic genes in the tissues where secondary walls are critical for growth and development. At the same time, suppression of its function is needed when/where formation of secondary walls is not desirable. Little is known about how this opposing control of secondary cell wall formation is achieved. We used both transient and transgenic expression of MYB46 and mitogen-activated protein kinase 6 (MPK6) to investigate the molecular mechanism of the post-translational regulation of MYB46. We show that MYB46 is phosphorylated by MPK6, leading to site specific phosphorylation-dependent degradation of MYB46 by the ubiquitin-mediated proteasome pathway. In addition, the MPK6-mediated MYB46 phosphorylation was found to regulate in planta secondary wall forming function of MYB46. Furthermore, we provide experimental evidences that MYB83, a paralog of MYB46, is not regulated by MPK6. The coupling of MPK signaling to MYB46 function provides insights into the tissue- and/or condition-specific activity of MYB46 for secondary wall biosynthesis.
- Authors:
-
- Michigan State Univ., East Lansing, MI (United States); National Academy of Agricultural Science, Jeonju (Korea)
- Kyung Hee Univ., Gyeonggi-do (Korea)
- Kyungpook National Univ., Daegu (Korea)
- Michigan State Univ., East Lansing, MI (United States)
- Publication Date:
- Research Org.:
- Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1804441
- Grant/Contract Number:
- SC0018409
- Resource Type:
- Accepted Manuscript
- Journal Name:
- PLoS Genetics
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 4; Journal ID: ISSN 1553-7404
- Publisher:
- Public Library of Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Im, Jong Hee, Ko, Jae-Heung, Kim, Won-Chan, Crain, Brent, Keathley, Daniel, and Han, Kyung-Hwan. Mitogen-activated protein kinase 6 negatively regulates secondary wall biosynthesis by modulating MYB46 protein stability in Arabidopsis thaliana. United States: N. p., 2021.
Web. doi:10.1371/journal.pgen.1009510.
Im, Jong Hee, Ko, Jae-Heung, Kim, Won-Chan, Crain, Brent, Keathley, Daniel, & Han, Kyung-Hwan. Mitogen-activated protein kinase 6 negatively regulates secondary wall biosynthesis by modulating MYB46 protein stability in Arabidopsis thaliana. United States. https://doi.org/10.1371/journal.pgen.1009510
Im, Jong Hee, Ko, Jae-Heung, Kim, Won-Chan, Crain, Brent, Keathley, Daniel, and Han, Kyung-Hwan. Wed .
"Mitogen-activated protein kinase 6 negatively regulates secondary wall biosynthesis by modulating MYB46 protein stability in Arabidopsis thaliana". United States. https://doi.org/10.1371/journal.pgen.1009510. https://www.osti.gov/servlets/purl/1804441.
@article{osti_1804441,
title = {Mitogen-activated protein kinase 6 negatively regulates secondary wall biosynthesis by modulating MYB46 protein stability in Arabidopsis thaliana},
author = {Im, Jong Hee and Ko, Jae-Heung and Kim, Won-Chan and Crain, Brent and Keathley, Daniel and Han, Kyung-Hwan},
abstractNote = {The R2R3-MYB transcription factor MYB46 functions as a master switch for secondary cell wall biosynthesis, ensuring the exquisite expression of the secondary wall biosynthetic genes in the tissues where secondary walls are critical for growth and development. At the same time, suppression of its function is needed when/where formation of secondary walls is not desirable. Little is known about how this opposing control of secondary cell wall formation is achieved. We used both transient and transgenic expression of MYB46 and mitogen-activated protein kinase 6 (MPK6) to investigate the molecular mechanism of the post-translational regulation of MYB46. We show that MYB46 is phosphorylated by MPK6, leading to site specific phosphorylation-dependent degradation of MYB46 by the ubiquitin-mediated proteasome pathway. In addition, the MPK6-mediated MYB46 phosphorylation was found to regulate in planta secondary wall forming function of MYB46. Furthermore, we provide experimental evidences that MYB83, a paralog of MYB46, is not regulated by MPK6. The coupling of MPK signaling to MYB46 function provides insights into the tissue- and/or condition-specific activity of MYB46 for secondary wall biosynthesis.},
doi = {10.1371/journal.pgen.1009510},
journal = {PLoS Genetics},
number = 4,
volume = 17,
place = {United States},
year = {Wed Apr 07 00:00:00 EDT 2021},
month = {Wed Apr 07 00:00:00 EDT 2021}
}
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