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Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds

Protein phosphorylation is an important post-translational modification that can regulate the protein function. The current knowledge on the phosphorylation status of plant oil body (OB) proteins is inadequate. This present study identifies the distinct physiological substrates of Arabidopsis serine...

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Autores principales: Ramachandiran, Iyappan, Vijayakumar, Anitha, Ramya, Visvanathan, Rajasekharan, Ram
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5773694/
https://www.ncbi.nlm.nih.gov/pubmed/29348626
http://dx.doi.org/10.1038/s41598-018-19311-3
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author Ramachandiran, Iyappan
Vijayakumar, Anitha
Ramya, Visvanathan
Rajasekharan, Ram
author_facet Ramachandiran, Iyappan
Vijayakumar, Anitha
Ramya, Visvanathan
Rajasekharan, Ram
author_sort Ramachandiran, Iyappan
collection PubMed
description Protein phosphorylation is an important post-translational modification that can regulate the protein function. The current knowledge on the phosphorylation status of plant oil body (OB) proteins is inadequate. This present study identifies the distinct physiological substrates of Arabidopsis serine/threonine/tyrosine protein kinase (STYK) and its role in seed oil accumulation; the role of Arabidopsis OLE1, a major seed OB protein has also been elucidated. In vitro kinase assay followed by mass spectrometry identifies residue that are phosphorylated by STYK. Further, co-expression of OLE1 and STYK in yeast cells increases the cellular lipid levels and reduces the total lipid when OLE1 was replaced with OLE1(T166A). Moreover, in vivo experiments with OB isolated from wild-type and styk knock-out lines show the ability of STYK to phosphorylate distinct OB proteins. OLE1(T166A) mutant and Arabidopsis styk mutant demonstrate the significant reduction of its substrate phosphorylation. styk mutant line significantly reduces the amount of total seed oil as compared to wild-type seeds. Together, our results provide the evidences that Arabidopsis At2G24360 (STYK) is phosphorylating oil body proteins and the phosphorylation regulates the oil content in Arabidopsis seeds.
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spelling pubmed-57736942018-01-26 Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds Ramachandiran, Iyappan Vijayakumar, Anitha Ramya, Visvanathan Rajasekharan, Ram Sci Rep Article Protein phosphorylation is an important post-translational modification that can regulate the protein function. The current knowledge on the phosphorylation status of plant oil body (OB) proteins is inadequate. This present study identifies the distinct physiological substrates of Arabidopsis serine/threonine/tyrosine protein kinase (STYK) and its role in seed oil accumulation; the role of Arabidopsis OLE1, a major seed OB protein has also been elucidated. In vitro kinase assay followed by mass spectrometry identifies residue that are phosphorylated by STYK. Further, co-expression of OLE1 and STYK in yeast cells increases the cellular lipid levels and reduces the total lipid when OLE1 was replaced with OLE1(T166A). Moreover, in vivo experiments with OB isolated from wild-type and styk knock-out lines show the ability of STYK to phosphorylate distinct OB proteins. OLE1(T166A) mutant and Arabidopsis styk mutant demonstrate the significant reduction of its substrate phosphorylation. styk mutant line significantly reduces the amount of total seed oil as compared to wild-type seeds. Together, our results provide the evidences that Arabidopsis At2G24360 (STYK) is phosphorylating oil body proteins and the phosphorylation regulates the oil content in Arabidopsis seeds. Nature Publishing Group UK 2018-01-18 /pmc/articles/PMC5773694/ /pubmed/29348626 http://dx.doi.org/10.1038/s41598-018-19311-3 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ramachandiran, Iyappan
Vijayakumar, Anitha
Ramya, Visvanathan
Rajasekharan, Ram
Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
title Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
title_full Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
title_fullStr Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
title_full_unstemmed Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
title_short Arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
title_sort arabidopsis serine/threonine/tyrosine protein kinase phosphorylates oil body proteins that regulate oil content in the seeds
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5773694/
https://www.ncbi.nlm.nih.gov/pubmed/29348626
http://dx.doi.org/10.1038/s41598-018-19311-3
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