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Updated: Jul 22, 2026

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Identification of Plasmodesmal Localization Sequences in Proteins In Planta
Published on: August 15, 2017
Agrobacterium VirE2のタンパク質が植物細胞で核部位化している
V Citovsky1, J Zupan, D Warnick
1Department of Plant Biology, University of California, Berkeley 94720.
まとめ
アグロバクテリアのVirE2タンパク質は,T鎖DNAを植物核に転送するのに役立ちます. 腫瘍形成に不可欠なこのタンパク質は,核の局所化信号 (NLS) を含み,DNAのインポートを容易にする.
科学分野:
- 分子生物学は分子生物学である.
- 植物病理学 植物病理学
- 微生物遺伝学 微生物遺伝学
背景:
- アグロバクテリア・トゥメファシエンス (Agrobacterium tumefaciens) は,T鎖DNAを植物細胞に転送する.
- T鎖は,単鎖DNA (ssDNA) の中間体である.
- VirD2タンパク質はT鎖の5'端を結合し,VirE2はDNAをコーティングする.
研究 の 目的:
- アグロバクテリアのT鎖の核輸入におけるVirE2の役割を調査する.
- VirE2が核の局所化信号 (NLS) を有し,核の吸収に寄与するかどうかを判断する.
主な方法:
- VirE2をレポータータンパク質に融合させ,植物細胞におけるその局所化を追跡する.
- 既知のNLSとの同質性のために,VirE2におけるアミノ酸配列の分析.
- VirE2変異体と,VirE2.2を発現するトランスジェニック植物を用いた補充試験.
主要な成果:
- VirE2は,植物細胞核に局所化されたレポータータンパク質と融合した.
- VirE2には,Xenopus nucleoplasmin.の2部分のNLSに同類する2つの配列が含まれています.
- トランスジェニック植物におけるVirE2の発現は,アビルーラントなvirE2変異体における腫瘍発生性を回復させた.
結論:
- VirE2は,植物細胞内のT鎖DNAの核輸入において重要な役割を果たします.
- VirE2は機能的なNLSを有し,自身の核の局所化を媒介し,T鎖の核吸収を支援する可能性が高い.
- VirE2は,アグロバクテリア媒介の植物変容と植物における腫瘍発生に不可欠である.
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