Abstract:
:Phosphatidylinositol 3,5-bisphosphate [PtdIns(3,5)P2] is an important lipid in membrane trafficking in animal and yeast systems; however, its role is still largely obscure in plants. Here, we demonstrate that the phosphatidylinositol 3-phosphate 5-kinase, formation of aploid and binucleate cells1 (FAB1)/FYVE finger-containing phosphoinositide kinase (PIKfyve), and its product, PtdIns(3,5)P2, are essential for the maturation process of endosomes to mediate cortical microtubule association of endosomes, thereby controlling proper PIN-FORMED protein trafficking in young cortical and stele cells of root. We found that FAB1 predominantly localizes on the Sorting Nexin1 (SNX1)-residing late endosomes, and a loss of FAB1 function causes the release of late endosomal proteins, Ara7, and SNX1 from the endosome membrane, indicating that FAB1, or its product PtdIns(3,5)P2, mediates the maturation process of the late endosomes. We also found that loss of FAB1 function causes the release of endosomes from cortical microtubules and disturbs proper cortical microtubule organization.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Hirano T,Munnik T,Sato MHdoi
10.1104/pp.15.01368subject
Has Abstractpub_date
2015-11-01 00:00:00pages
1961-74issue
3eissn
0032-0889issn
1532-2548pii
pp.15.01368journal_volume
169pub_type
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