Dynamic Regulation of Cortical Microtubule Organization through Prefoldin-DELLA Interaction

Plant morphogenesis relies on specific patterns of cell division and expansion. It is well established that cortical microtubules influence the direction of cell expansion [1, 2], but less is known about the molecular mechanisms that regulate microtubule arrangement. Here we show that the phytohormo...

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Bibliographic Details
Published in:Current biology 2013-05, Vol.23 (9), p.804-809
Main Authors: Locascio, Antonella, Blázquez, Miguel A., Alabadí, David
Format: Article
Language:English
Subjects:
Arabidopsis - cytology
Arabidopsis - growth & development
Arabidopsis - physiology
Arabidopsis Proteins - metabolism
Cell Cycle
Cell Division
gibberellins
Gibberellins - metabolism
microtubules
Microtubules - metabolism
Molecular Chaperones - metabolism
morphogenesis
Nicotiana - cytology
Nicotiana - physiology
Nuclear Proteins - metabolism
plant growth
Plant Growth Regulators - metabolism
plant hormones
tubulin
Tubulin - metabolism
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Summary:Plant morphogenesis relies on specific patterns of cell division and expansion. It is well established that cortical microtubules influence the direction of cell expansion [1, 2], but less is known about the molecular mechanisms that regulate microtubule arrangement. Here we show that the phytohormones gibberellins (GAs) regulate microtubule orientation through physical interaction between the nuclear-localized DELLA proteins and the prefoldin complex, a cochaperone required for tubulin folding [3]. In the presence of GA, DELLA proteins are degraded, and the prefoldin complex stays in the cytoplasm and is functional. In the absence of GA, the prefoldin complex is localized to the nucleus, which severely compromises α/β-tubulin heterodimer availability, affecting microtubule organization. The physiological relevance of this molecular mechanism was confirmed by the observation that the daily rhythm of plant growth was accompanied by coordinated oscillation of DELLA accumulation, prefoldin subcellular localization, and cortical microtubule reorientation. ► The nuclear-localized DELLA proteins interact with α-subunits of the prefoldin complex. ► Prefoldin accumulates in the nucleus in a DELLA-dependent manner. ► Prefoldin nuclear localization reduces the pool of available α/β-tubulin heterodimers. ► Prefoldin localization and microtubule orientation oscillate with a daily pattern
ISSN:0960-9822
1879-0445
DOI:10.1016/j.cub.2013.03.053