期刊
JOURNAL OF PLANT RESEARCH
卷 128, 期 2, 页码 327-336出版社
SPRINGER JAPAN KK
DOI: 10.1007/s10265-014-0687-2
关键词
Arabidopsis; Cytokinesis; Cell plates; Kinesin; Microtubules
资金
- JSPS [25114504]
- Ministry of Education, Culture, Sports, Science and Technology of Japan [19060003, 21770040, 26840086, 23370021]
- Hirosaki University
- Sumitomo Foundation
- Hirosaki University Institutional Research Grant for Young Scientists
- Grants-in-Aid for Scientific Research [26840086, 25114504, 26291058, 21770040, 24570048, 19060003, 23370021, 25650094, 26660290, 26113509] Funding Source: KAKEN
Plant cytokinesis is achieved by formation of cell plates in the phragmoplast, a plant-specific cytokinetic apparatus, which consists of microtubules (MTs) and microfilaments. During cytokinesis, the cell plate is expanded centrifugally outward from the inside of cells in a process that is supported by dynamic turnover of MTs. M-phase-specific kinesin NACK1, which comprises the motor domain at the amino-terminal half to move on MT bundles and the stalk region in the carboxyl-terminal half, is a key player in the process of MT turnover. That is, the specific region in the stalk binds the MAP kinase kinase kinase to activate the whole MAP kinase cascade, which stimulates depolymerization of MTs for the MT turnover. The stalk is also responsible for recruiting the activated kinase cascade to the mid-zone of the phragmoplast, which corresponds to the cell-plate formation site. It should be crucial to uncover roles of the NACK1 kinesin stalk as well as the motor domain in the formation of cell plates in order to understand the mechanisms of cell plate formation. Using dissected Arabidopsis NACK1 (AtNACK1/HINKEL) molecules and AtNACK1-fused GFP, we showed that the C-terminal tail of the stalk in addition to the motor domain is critical for its proper localization to the site of cell plate formation in the phragmoplast, probably by affecting its motility activity.
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