免疫グロブリンオクタマーDNAモチーフに特異的なヒトタンパク質には,機能的なホメオボックスドメインが含まれています
Cell
|October 7, 1988
まとめ
研究者らは,ヒトのホメオボックスタンパク質を特定し,酵母とドロソフィラのタンパク質に似た方法でDNAを結合させた. このリンパ球受限タンパク質は,染色体19に局在しており,ホメオボックス遺伝子の機能と進化を理解するための意味を持っています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- タンパク質科学 タンパク質科学
背景:
- ホメオボックスドメインは,ドロソフィラのホメオティックタンパク質や酵母交配型タンパク質を含む種間のタンパク質に存在する保存されたDNA結合モチーフです.
- 機能的に特徴づけられていない哺乳類のタンパク質には,ホメオボックスドメインも含まれており,多様な役割が示唆されています.
研究 の 目的:
- ホメオボックスドメインを含むリンパ球受限型ヒトタンパク質の新種の特徴を特定する.
- このヒトホメオボックスタンパク質のDNA結合特性と染色体局在性を調査するために.
主な方法:
- シーケンス分析は,既知のホームボックスドメインとのアミノ酸同一性を決定する.
- 遺伝子マッピング技術を用いた染色体局在化.
- サイト・ディレクテッド・ミュータゲネシスにより,ヘリックス・ターン・ヘリックス・モチーフの置換による変異タンパク質が作られます.
- タンパク質とDNAの相互作用を評価するためのDNA結合測定法.
主要な成果:
- ヒトのホメオボックス遺伝子は,コンセンサスホメオボックス配列に33%のアミノ酸同一性を持つリンパ性受限タンパク質で特定されました.
- この遺伝子は染色体19にマッピングされ,他のヒトホメオボックス遺伝子とは異なる.
- 機能的なヘリックス-ターン-ヘリックスモチーフが欠けている変異タンパク質は,検出可能なDNA結合を示さなかった.
- 人間のホメオボックスタンパク質は,酵母とドロソフィラのホメオボックスタンパク質と同じDNA配列を結合します.
結論:
- 人間のホメオボックスタンパク質は,酵母とドロソフィラの同種と保存されたDNA結合特性を共有しています.
- 染色体19に確認されたホメオボックス遺伝子は,ヒトホメオボックス遺伝子ファミリーに新しく追加された遺伝子を表しています.
- ホメオボックス領域内のヘリックス・ターン・ヘリックスモチーフは,DNA結合に極めて重要です.
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