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A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice
Anthocyanins are responsible pigments for giving attractive colors of plant organs and nutraceutical benefits of grains. Anthocyanin biosynthesis is known to be regulated by transcription factors and other regulatory proteins. In rice (Oryza sativa), the R2R3 MYB transcription factor (TF) OsC1 and a...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121638/ https://www.ncbi.nlm.nih.gov/pubmed/30060460 http://dx.doi.org/10.3390/ijms19082190 |
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author | Kim, Da-Hye Park, Sangkyu Lee, Jong-Yeol Ha, Sun-Hwa Lee, Jun-Gu Lim, Sun-Hyung |
author_facet | Kim, Da-Hye Park, Sangkyu Lee, Jong-Yeol Ha, Sun-Hwa Lee, Jun-Gu Lim, Sun-Hyung |
author_sort | Kim, Da-Hye |
collection | PubMed |
description | Anthocyanins are responsible pigments for giving attractive colors of plant organs and nutraceutical benefits of grains. Anthocyanin biosynthesis is known to be regulated by transcription factors and other regulatory proteins. In rice (Oryza sativa), the R2R3 MYB transcription factor (TF) OsC1 and a bHLH TF, OsB2, were previously reported to control anthocyanin biosynthesis in vegetative tissues and seeds, respectively; however, the regulatory mechanisms of the anthocyanin biosynthesis by TFs remain largely unknown. In this study, we identified OsBBX14, a homolog of Arabidopsis thaliana B-box domain protein 22 (AtBBX22), and investigated its function. The transcript level of OsBBX14 was high in pigmented rice seeds and gradually increased as the seeds matured. The ectopic expression of OsBBX14 in Arabidopsis resulted in a dramatic increase in anthocyanin accumulation in its seedlings. Using a steroid receptor-based inducible activation system, OsBBX14 and OsHY5 were found to directly activate OsC1 or OsB2 in an independent or collaborative manner. Yeast two hybrid revealed that the second B-box domain of OsBBX14 physically interacts with the bZIP domain of OsHY5. These results suggest that the anthocyanin biosynthesis in rice is induced and finely tuned by OsBBX14 in collaboration with OsHY5. |
format | Online Article Text |
id | pubmed-6121638 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-61216382018-09-07 A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice Kim, Da-Hye Park, Sangkyu Lee, Jong-Yeol Ha, Sun-Hwa Lee, Jun-Gu Lim, Sun-Hyung Int J Mol Sci Article Anthocyanins are responsible pigments for giving attractive colors of plant organs and nutraceutical benefits of grains. Anthocyanin biosynthesis is known to be regulated by transcription factors and other regulatory proteins. In rice (Oryza sativa), the R2R3 MYB transcription factor (TF) OsC1 and a bHLH TF, OsB2, were previously reported to control anthocyanin biosynthesis in vegetative tissues and seeds, respectively; however, the regulatory mechanisms of the anthocyanin biosynthesis by TFs remain largely unknown. In this study, we identified OsBBX14, a homolog of Arabidopsis thaliana B-box domain protein 22 (AtBBX22), and investigated its function. The transcript level of OsBBX14 was high in pigmented rice seeds and gradually increased as the seeds matured. The ectopic expression of OsBBX14 in Arabidopsis resulted in a dramatic increase in anthocyanin accumulation in its seedlings. Using a steroid receptor-based inducible activation system, OsBBX14 and OsHY5 were found to directly activate OsC1 or OsB2 in an independent or collaborative manner. Yeast two hybrid revealed that the second B-box domain of OsBBX14 physically interacts with the bZIP domain of OsHY5. These results suggest that the anthocyanin biosynthesis in rice is induced and finely tuned by OsBBX14 in collaboration with OsHY5. MDPI 2018-07-27 /pmc/articles/PMC6121638/ /pubmed/30060460 http://dx.doi.org/10.3390/ijms19082190 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kim, Da-Hye Park, Sangkyu Lee, Jong-Yeol Ha, Sun-Hwa Lee, Jun-Gu Lim, Sun-Hyung A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice |
title | A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice |
title_full | A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice |
title_fullStr | A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice |
title_full_unstemmed | A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice |
title_short | A Rice B-Box Protein, OsBBX14, Finely Regulates Anthocyanin Biosynthesis in Rice |
title_sort | rice b-box protein, osbbx14, finely regulates anthocyanin biosynthesis in rice |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121638/ https://www.ncbi.nlm.nih.gov/pubmed/30060460 http://dx.doi.org/10.3390/ijms19082190 |
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