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ゴルギ・スタックを通して生合成タンパク質の輸送を媒介する,新種のコーティングベシクルを浄化
V Malhotra1, T Serafini, L Orci
1Department of Biology Princeton University, New Jersey 08544.
Cell
|July 28, 1989
まとめ
研究者らは,タンパク質輸送に関与する新しいゴルジ系由来のコーティングされた小胞を精製した. クラスリンで覆われたものとは異なるこれらの膀は,ATP,サイトゾール,GTP gamma S.を含む新しいスキームを使用して分離されました.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- ノンクラトリンで覆われた膀は,ゴルギの水槽間,そして潜在的にERからゴルギへのタンパク質輸送を媒介する.
- これらの膀の組成と機能を理解することは,細胞内トラフィックの経路を明らかにするために極めて重要です.
研究 の 目的:
- ゴルギ輸送に関与する非クラトリンコーティングの膀のための浄化スキームを開発し,記述する.
- これらの精製された膀のポリペプチド組成を特徴付けるために.
主な方法:
- GTPガンマSの存在下でのATPとサイトゾールによるゴルギ膜のインキュベーションにより,膀が蓄積されます.
- 高濃度の塩を使用したゴルギ水槽からコーティングされた水泡の解離.
- 微分と密度グラデーションの離心分離によるゴルギ系由来のコーティングベシクルの浄化.
主要な成果:
- ゴルギ系由来のコーティングベシクルを浄化する方法が確立されました.
- これらの膀は,膀融合を阻害する特定の条件 (ATP,サイトゾール,GTPガンマS) の下で蓄積します.
- 精製された膀は,サイトゾール,ゴルギ膜,クラトリンで覆われた膀と比較して独特のポリペプチド組成を示します.
結論:
- 記述されたスキームは,ゴルジ系由来のコーティングされた小胞を効果的に浄化します.
- これらの膀は,ゴルギ内および潜在的なER-to-Golgi輸送に関与する独特の集団を表しています.
- 彼らのユニークなポリペプチドシグネチャーは,タンパク質の密輸における特殊な役割を示唆しています.
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