潜伏するイントロンでコードされたマチュラーゼは,イントロンの移動に必要なエンドヌクレアゼでもある
J M Wenzlau1, R J Saldanha, R A Butow
1Department of Molecular Genetics, Ohio State University, Columbus 43210.
Cell
|February 10, 1989
まとめ
酵母菌のミトコンドリアのイントロンは,遺伝子変換によって増殖することができる. コックスル遺伝子のal4αイントロンは,マチュラーゼと強力なDNAエンドヌクレアゼの両方で作用するタンパク質をコードし,自身の拡散を促進します.
科学分野:
- 分子生物学は分子生物学である.
- イースト遺伝学 イースト遺伝学
- イントロン進化の進化
背景:
- 酵母菌のミトコンドリアのイントロンはタンパク質をコードすることができます.
- これらのタンパク質には,マチュラゼ (スプライシング) とエンドヌクレアゼ (遺伝子変換) が含まれる.
- fit1エンドヌクレアスは,イントロンの伝播を促進する.
研究 の 目的:
- コックスル遺伝子のイントロンの遺伝子変換能力を調査する.
- al4αイントロンが他の遺伝子に伝播できるかどうかを判断する.
- al4αイントロン産物の機能を特徴付けるために.
主な方法:
- 酵母における遺伝子変換アッセイ.
- DNAにおけるエンドヌクレオリシス分裂の検出.
- al4alpha オープン・リーディング・フレームの分析.
主要な成果:
- グループIイントロン,al4αは,それを欠いているコクセル遺伝子に効率的に伝達された.
- イントロンの挿入部位近くの受容者のDNAに内核分解性分裂が観察されました.
- 遺伝子変換は,無傷のal4alpha開いた読み取りフレームに依存していた.
結論:
- al4αイントロン産物は,潜在的成熟酵素と強力な内核酵素の両方として機能します.
- この二重機能のタンパク質は,DNAの再結合とイントロンの伝播に関与しています.
- 双重機能のタンパク質は,イントロンの拡散と受容に極めて重要だったかもしれない.
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