BRASSINOSTEROID INSENSITIVE2 negatively regulates cellulose synthesis in Arabidopsis by phosphorylating cellulose synthase 1

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Sanchez-Rodriguez, Clara
Ketelaar, KassaDee J.
Schneider, Rene
Villalobos, Jose A.
Somerville, Chris R.
Persson, Staffan
Wallace, Ian S.

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2017

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Article

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regulation , cellulose synthase , plant cell wall , brassinosteroid

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Abstract

The deposition of cellulose is a defining aspect of plant growth and development, but regulation of this process is poorly understood. Here, we demonstrate that the protein kinase BRASSINOSTEROID INSENSITIVE2 (BIN2), a key negative regulator of brassinosteroid (BR) signaling, can phosphorylate Arabidopsis cellulose synthase A1 (CESA1), a subunit of the primary cell wall cellulose synthase complex, and thereby negatively regulate cellulose biosynthesis. Accordingly, point mutations of the BIN2-mediated CESA1 phosphorylation site abolished BIN2-dependent regulation of cellulose synthase activity. Hence, we have uncovered a mechanism for how BR signaling can modulate cellulose synthesis in plants.

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Sánchez-Rodríguez, C., Ketelaar, K., Schneider, R., Villalobos, J. A., Somerville, C. R., Persson, S., & Wallace, I. S. (2017). BRASSINOSTEROID INSENSITIVE2 negatively regulates cellulose synthesis in Arabidopsis by phosphorylating cellulose synthase 1. Proceedings of the National Academy of Sciences, 114(13), 3533�"3538. doi:10.1073/pnas.1615005114

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In Copyright (All Rights Reserved)

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0027-8424

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