title: The carboxyl-terminal tail of the stalk of Arabidopsis NACK1/HINKEL kinesin is required for its localization to the cell plate formation site.
abstract: 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.
authors.affiliation: Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya, 464-8602, Japan, msasabe@cc.hirosaki-u.ac.jp.
authors.forename: Michiko
authors.initials: M
authors.lastname: Sasabe
authors.forename: Nanako
authors.initials: N
authors.lastname: Ishibashi
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Haruta
authors.forename: Aki
authors.initials: A
authors.lastname: Minami
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kurihara
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Higashiyama
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Nishihama
authors.forename: Masaki
authors.initials: M
authors.lastname: Ito
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Machida
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D048749:Cytokinesis; D008869:Microtubule-Associated Proteins / Q000235:genetics* / Q000378:metabolism; D008870:Microtubules / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; C452431:HINKEL protein, Arabidopsis; D008869:Microtubule-Associated Proteins