芽生える酵母SKP1は,細胞サイクル進行に必要な進化的に保存されたキネトコアタンパク質をコードします
1Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Cell
|July 26, 1996
まとめ
SKP1遺伝子は,細胞分裂に不可欠な保存されたキネトコアタンパク質をコードします. 変異により,キネトコア機能と細胞周期調節における二重の役割が明らかになった.
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.
- 遺伝学 遺伝学とは
背景:
- 芽生えた酵母におけるSKP1遺伝子は,キネトコアタンパク質変異体の抑制剤として特定されました.
- CBF3複合体のサブユニットをコードし,セントロメアDNAに結合します.
- キネトコアは,細胞分裂中の適切な染色体分離に不可欠です.
研究 の 目的:
- SKP1遺伝子とその暗号化されたタンパク質 (Skp1p) の機能を調査する.
- 細胞サイクル進行とキネトコア機能におけるSkp1pの役割を決定する.
- SKP1.1の進化的保存を評価する.
主な方法:
- SKP1遺伝子における温度感受性突然変異の分析.
- 変異酵母菌株のフェノタイプの特徴付け,細胞サイクル分析とDNA含有量決定を含む.
- 他の真核生物におけるSkp1p同類体の生物情報識別.
主要な成果:
- SKP1はCBF3複合体の22.3kDaのサブユニットをコードしています.
- skp1-4変異体は,短いミトーシス・スピンドルでG2逮捕を示し,キネトコア機能の役割を示しています.
- skp1-3変異体は,複数の芽を持つG1停止を示しており,G1/S相移行における追加の役割を示唆しています.
- Skp1pの同種はC. elegans,A. thaliana,H. sapiensで発見され,高い進化的保存性を示した.
結論:
- Skp1pは,進化的に保存された,内在的なキネトコアタンパク質です.
- SKP1は,キネトコア機能と細胞周期調節 (G1/SとG2段階) の両方で重要な役割を果たします.
- Skp1pは,キネトコア活動と細胞サイクル制御機構を結びつけることができる.
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