title: Changes in cellular distribution regulate SKD1 ATPase activity in response to a sudden increase in environmental salinity in halophyte ice plant.
abstract: Halophyte Mesembryanthemum crystallinum L. (ice plant) rapidly responds to sudden increases in salinity in its environment by activating specific salt-tolerant mechanisms. One major strategy is to regulate a series of ion transporters and proton pumps to maintain cellular Na(+)/K(+) homeostasis. Plant SKD1 (suppressor of K(+) transport growth defect 1) proteins accumulate in cells actively engaged in the secretory processes, and play a critical role in intracellular protein trafficking. Ice plant SKD1 redistributes from the cytosol to the plasma membrane hours after salt stressed. In combination with present knowledge of this protein, we suggest that stress facilitates SKD1 movement to the plasma membrane where ADP/ATP exchange occurs, and functions in the regulation of membrane components such as ion transporters to avoid ion toxicity.
authors.affiliation: Department of Biotechnology; National Pingtung University of Science and Technology; Neipu, Pingtung, Taiwan.
authors.forename: Yingtzy
authors.initials: Y
authors.lastname: Jou
authors.affiliation: Department of Life Sciences; National Chung Hsing University; Taichung, Taiwan.
authors.forename: Chih-Pin
authors.initials: CP
authors.lastname: Chiang
authors.affiliation: Department of Life Sciences; National Chung Hsing University; Taichung, Taiwan.
authors.forename: Hungchen Emilie
authors.initials: HE
authors.lastname: Yen
mesh_terms: D000244:Adenosine Diphosphate / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D004777:Environment; D005455:Fluorescent Antibody Technique; D035723:Mesembryanthemum / Q000201:enzymology*; D008954:Models, Biological; D010940:Plant Proteins / Q000378:metabolism*; D054712:Salinity; D055051:Salt-Tolerant Plants / Q000201:enzymology*
chemical_list: D010940:Plant Proteins; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases
keywords: AAA-ATPase; SKD1; ice plant; protein trafficking; salt stress