【博士論文】学術データベース

博士論文 / UDP-D-galactose-dependent organization of the trans-Golgi network & Mechanisms for polar localization of boric acid channels in Arabidopsis thaliana シロイヌナズナにおけるUDP-D-ガラクトースに依存したトランスゴルジ網の構造維持およびホウ酸チャネルの細胞膜内偏在機構

書誌事項

タイトル

UDP-D-galactose-dependent organization of the trans-Golgi network & Mechanisms for polar localization of boric acid channels in Arabidopsis thaliana

タイトル別名

シロイヌナズナにおけるUDP-D-ガラクトースに依存したトランスゴルジ網の構造維持およびホウ酸チャネルの細胞膜内偏在機構

学位授与大学

Hokkaido University(北海道大学) (大学ID:0001) (CAT機関ID:KI000017)

取得学位

博士(農学)

学位授与番号

甲第11997号

学位授与年月日

2015-09-25

注記・抄録

Endomembrane organization is essential for cell physiology. A previous study identified an Arabidopsis thaliana mutant in which a plasma membrane (PM) marker GFP-NIP5;1 and trans-Golgi network/early endosome (TGN/EE) markers were accumulated in intracellular aggregates in epidermal cells of the root elongation zone. The mutant was identified as an allele of UDP-glucose epimerase 4 (UGE4)/root hair defective 1/root epidermal bulgar 1, which was previously described as a mutant with swollen root epidermal cells and has an altered sugar composition in cell wall polysaccharides. Importantly, these defects including aggregate formation were restored by supplementation of D-galactose in the medium. These results suggested that UDP-D-galactose synthesis by UGE4 is important for endomembrane organization in addition to cell wall structure. Here, I further investigated the nature of the aggregates using various markers of endomembrane compartments and BOR1-GFP, which traffics from PM to vacuole in response to high-B supply. The markers of multi-vesicular bodies/late endosomes (MVB/LEs) and BOR1-GFP were strongly accumulated in the intracellular aggregates, while those of the endoplasmic reticulum (ER), the vacuolar membrane, and the Golgi were only slightly affected in the uge4 mutant. The abnormal localizations of these markers in the uge4 mutant differed from the effects of inhibitors of actin and microtubule polymerization, although they also affected endomembrane organization. Furthermore, electron microscopy analysis revealed accumulation of abnormal high-electron-density vesicles in elongating epidermal cells. The abnormal vesicles were often associated or interconnected with TGN/EEs and contained ADP-ribosylation factor 1, which is usually localized to the Golgi and the TGN/EEs. On the other hand, structures of the ER, Golgi apparatus, and MVB/LEs were apparently normal in uge4 cells. Together, these data indicate the importance of UDP-D-galactose synthesis by UGE4 for the organization and function of endomembranes, especially TGN/EEs, which are a sorting station of the secretory and vacuolar pathways.

III, 117p

Hokkaido University(北海道大学). 博士(農学)

各種コード

NII論文ID(NAID)

500001052215

DOI

info:doi/10.14943/doctoral.k11997

本文言語コード

eng

データ提供元

NDLデジタルコレクション

DOI

博士論文 / 北海道大学 / 農学

博士論文 / 北海道大学

博士論文 / 農学

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