Cargando…

Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis

The expression of CBF (C-repeat-binding factor) genes is required for freezing tolerance in Arabidopsis thaliana. CBFs are positively regulated by INDUCER OF CBF EXPRESSION1 (ICE1) and negatively regulated by MYB15. These transcription factors directly interact with specific elements in the CBF prom...

Descripción completa

Detalles Bibliográficos
Autores principales: Kim, Sun Ho, Kim, Ho Soo, Bahk, Sunghwa, An, Jonguk, Yoo, Yeji, Kim, Jae-Yean, Chung, Woo Sik
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5499865/
https://www.ncbi.nlm.nih.gov/pubmed/28510716
http://dx.doi.org/10.1093/nar/gkx417
_version_ 1783248543773884416
author Kim, Sun Ho
Kim, Ho Soo
Bahk, Sunghwa
An, Jonguk
Yoo, Yeji
Kim, Jae-Yean
Chung, Woo Sik
author_facet Kim, Sun Ho
Kim, Ho Soo
Bahk, Sunghwa
An, Jonguk
Yoo, Yeji
Kim, Jae-Yean
Chung, Woo Sik
author_sort Kim, Sun Ho
collection PubMed
description The expression of CBF (C-repeat-binding factor) genes is required for freezing tolerance in Arabidopsis thaliana. CBFs are positively regulated by INDUCER OF CBF EXPRESSION1 (ICE1) and negatively regulated by MYB15. These transcription factors directly interact with specific elements in the CBF promoters. Mitogen-activated protein kinase (MAPK/MPK) cascades function upstream to regulate CBFs. However, the mechanism by which MPKs control CBF expression during cold stress signaling remains unknown. This study showed that the activity of MYB15, a transcriptional repressor of cold signaling, is regulated by MPK6-mediated phosphorylation. MYB15 specifically interacts with MPK6, and MPK6 phosphorylates MYB15 on Ser168. MPK6-induced phosphorylation reduced the affinity of MYB15 binding to the CBF3 promoter and mutation of its phosphorylation site (MYB15(S168A)) enhanced the transcriptional repression of CBF3 by MYB15. Furthermore, transgenic plants overexpressing MYB15(S168A) showed significantly reduced CBF transcript levels in response to cold stress, compared with plants overexpressing MYB15. The MYB15(S168A)-overexpressing plants were also more sensitive to freezing than MYB15-overexpressing plants. These results suggest that MPK6-mediated regulation of MYB15 plays an important role in cold stress signaling in Arabidopsis.
format Online
Article
Text
id pubmed-5499865
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-54998652017-07-12 Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis Kim, Sun Ho Kim, Ho Soo Bahk, Sunghwa An, Jonguk Yoo, Yeji Kim, Jae-Yean Chung, Woo Sik Nucleic Acids Res Molecular Biology The expression of CBF (C-repeat-binding factor) genes is required for freezing tolerance in Arabidopsis thaliana. CBFs are positively regulated by INDUCER OF CBF EXPRESSION1 (ICE1) and negatively regulated by MYB15. These transcription factors directly interact with specific elements in the CBF promoters. Mitogen-activated protein kinase (MAPK/MPK) cascades function upstream to regulate CBFs. However, the mechanism by which MPKs control CBF expression during cold stress signaling remains unknown. This study showed that the activity of MYB15, a transcriptional repressor of cold signaling, is regulated by MPK6-mediated phosphorylation. MYB15 specifically interacts with MPK6, and MPK6 phosphorylates MYB15 on Ser168. MPK6-induced phosphorylation reduced the affinity of MYB15 binding to the CBF3 promoter and mutation of its phosphorylation site (MYB15(S168A)) enhanced the transcriptional repression of CBF3 by MYB15. Furthermore, transgenic plants overexpressing MYB15(S168A) showed significantly reduced CBF transcript levels in response to cold stress, compared with plants overexpressing MYB15. The MYB15(S168A)-overexpressing plants were also more sensitive to freezing than MYB15-overexpressing plants. These results suggest that MPK6-mediated regulation of MYB15 plays an important role in cold stress signaling in Arabidopsis. Oxford University Press 2017-06-20 2017-05-16 /pmc/articles/PMC5499865/ /pubmed/28510716 http://dx.doi.org/10.1093/nar/gkx417 Text en © The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Molecular Biology
Kim, Sun Ho
Kim, Ho Soo
Bahk, Sunghwa
An, Jonguk
Yoo, Yeji
Kim, Jae-Yean
Chung, Woo Sik
Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis
title Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis
title_full Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis
title_fullStr Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis
title_full_unstemmed Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis
title_short Phosphorylation of the transcriptional repressor MYB15 by mitogen-activated protein kinase 6 is required for freezing tolerance in Arabidopsis
title_sort phosphorylation of the transcriptional repressor myb15 by mitogen-activated protein kinase 6 is required for freezing tolerance in arabidopsis
topic Molecular Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5499865/
https://www.ncbi.nlm.nih.gov/pubmed/28510716
http://dx.doi.org/10.1093/nar/gkx417
work_keys_str_mv AT kimsunho phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis
AT kimhosoo phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis
AT bahksunghwa phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis
AT anjonguk phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis
AT yooyeji phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis
AT kimjaeyean phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis
AT chungwoosik phosphorylationofthetranscriptionalrepressormyb15bymitogenactivatedproteinkinase6isrequiredforfreezingtoleranceinarabidopsis