Journal
CURRENT BIOLOGY
Volume 23, Issue 9, Pages 804-809Publisher
CELL PRESS
DOI: 10.1016/j.cub.2013.03.053
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Funding
- Spanish Ministry of Science and Innovation [BIO2010-15071, CSD2007-00057]
- Generalitat Valenciana [ACOMP/2011/288, PROMETEO/2010/020]
- Fondo per gli Investimenti della Ricerca di Base of the Italian Ministry of Education, the University, and Research (MIUR)
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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 alpha/beta-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.
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