The NPK1 mitogen-activated protein kinase kinase kinase is a regulator of cell-plate formation in plant cytokinesis

被引:162
作者
Nishihama, R
Ishikawa, M
Araki, S
Soyano, T
Asada, T
Machida, Y
机构
[1] Nagoya Univ, Grad Sch Sci, Div Biol Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan
[2] Osaka Univ, Grad Sch Sci, Dept Biol, Toyonaka, Osaka 5600043, Japan
关键词
MAPKKK; NPK1 protein kinase; kinase-negative mutant; cell plate; phragmoplast; cytokinesis;
D O I
10.1101/gad.863701
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Mitogen-activated protein kinase (MAPK) cascades play important roles not only in the transduction of extracellular signals but in the progression of the cell cycle. However, evidence for their role in cytokinesis is limited. Here, we show that a tobacco MAPK kinase kinase (MAPKKK), designated NPK1, is required for cytokinesis. The activity of NPK1 increases in the late M phase of the tobacco cell cycle. During expansion of a new cross-wall (cell plate) toward the cell cortex, NPK1 is consistently localized to the equatorial zone of the phragmoplast, the cytokinetic apparatus where the cell plate is formed. Expression of a kinase-negative mutant of NPK1 results in the generation of multinucleate cells with incomplete cell plates. Phragmoplasts can be formed, but its expansion toward the cell cortex is also blocked. Thus, our results indicate that the NPK1 MAPKKK is essential for the formation of the cell plate, especially for its lateral growth.
引用
收藏
页码:352 / 363
页数:12
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