リバーストランスクリプタゼは,Myxococcus xanthusの分岐RNA結合 msDNAの生物合成に関連しています
1Department of Biochemistry, Robert Wood Johnson Medical School at Rutgers University of Medicine and Dentistry of New Jersey, Piscataway 08854.
Cell
|February 24, 1989
まとめ
研究者らは,m. xanthusの逆転写酵素遺伝子を特定し, msDNA (移動遺伝的RNA-DNA) 合成に不可欠である. この発見は,レトロウイルスとバクテリアの古代のmsDNAシステムとの関連性を示唆しています.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- ミキソバクテリアは msDNAとして知られるユニークなRNA-DNA複合体を合成します.
- msDNAは,RNA分子 (msdRNA) から2',5'のフォスフォディエステル結合を通じて分岐した単一鎖DNAを特徴としています.
- リバーストランスクリプターゼの活性が,msDNAのバイオシンセシスにとって極めて重要であると仮定されている.
研究 の 目的:
- M. xanthus. の逆転写酵素活性に起因する遺伝子を特定する.
- msDNAシステムの進化的起源と関係を調査する.
主な方法:
- M. xanthus. の遺伝子識別と配列決定
- 特定された遺伝子とそのタンパク質産物のバイオ情報分析.
- 既知の逆転写写酵素との比較シーケンス分析.
主要な成果:
- 485アミノ酸ポリペプチドをコードする遺伝子が,レトロウイルス逆転写酵素と配列の類似性を有していることが確認されました.
- この遺伝子は,msdRNAのコーディング領域の下流に位置しています.
- 分析によると,msDNAシステムは,M. xanthusで古くから存在しており,最近発見されたものではない.
結論:
- 特定された遺伝子は,mSDNA合成に責任を持つ逆転写酵素である可能性が高い.
- この発見は,レトロウイルスとバクテリアのmsDNAシステムとの間の潜在的な進化的関連を示唆しています.
- msDNAシステムは,M. xanthus. の進化的に保存された特徴です.
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