キシログルカンフコシルトランスフェラーゼは,植物細胞壁の生物合成に関与する酵素です
R M Perrin1, A E DeRocher, M Bar-Peled
1Michigan State University-Department of Energy (MSU-DOE) Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA.
まとめ
研究者らは,植物細胞壁に含まれる重要な酵素を特定した. このフコシルトランスフェラーゼ (FTase) は,キセログルカン (XG) に必須糖を加え,植物の発達と防御に影響を与えます.
科学分野:
- 植物生物学 植物生物学
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
背景:
- 植物の細胞壁は,植物の構造,成長,防御に不可欠です.
- キシログルカン (XG) は,二コト細胞壁の主要な構造成分であり,末端のフコシル残留物によって特徴付けられます.
- フクソシルトランスフェラーゼ (FTase) 酵素は,この重要なフクソース残基の添加を担当しています.
研究 の 目的:
- 植物におけるキシログルカン (XG) 改変に起因する特定のフコシルトランスファーゼ (FTase) を特定し,特徴づけること.
- アラビドプシスから特定されたFTaseをコードする遺伝子をクローン化するために.
主な方法:
- pea epicotyls.から60キロダルトンのFT酶を浄化する.
- 精製された pea FTaseのペプチド配列.
- ホモログのアラビドプシスFT1遺伝子のクローニング.
- 再結合アラビドプシス FTase.に対する抗体生成.
- 溶解したアラビドプシスの膜タンパク質とAtFT1.1を発現するCOS細胞を用いた酵素活性測定法.
主要な成果:
- 60キロダルトンのFTaseが豆のエピコチルから浄化されました.
- ペプチド配列のデータは,同類のアラビドプシス遺伝子であるAtFT1.1のクローニングを可能にしました.
- 抗体は,AtFT1がXGを改変するFTASEをコードしていることを確認した.
- 哺乳類の細胞におけるAtFT1の発現は,XG FTase活性を与えました.
結論:
- AtFT1遺伝子は,機能的なキシログルカンフコシルトランスフェラーゼ (XG FTase) をコードする.
- この酵素は植物細胞壁の生物合成において重要な役割を果たします.
- XG FTaseの機能を理解することで,植物の発達と病気に対する耐性メカニズムについての洞察が得られます.
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