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Updated: Jul 6, 2026

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High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
TATA結合タンパク質および関連因子は,pol III転写因子TFIIIBの成分である
A K Taggart1, T S Fisher, B F Pugh
1Department of Molecular and Cell Biology, Pennsylvania State University, University Park 16802.
Cell
|December 11, 1992
まとめ
研究者は,RNAポリメラーゼIII (polIII) 転写に不可欠な新しいTATA結合タンパク質関連因子 (TAF) を特定しました. これらのTAF,TAF-172とTAF-Lは,ポリIIIの活性を調節し,ポリIIの転写に影響を与えます.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- 転写因子 トランスクリプション・ファクター
背景:
- TATA結合タンパク質 (TBP) は,RNAポリメラーゼI,II,IIIによる転写開始に不可欠である.
- TBP関連因子 (TAFs) は,転写におけるポリメラーゼ特異性に寄与する.
- RNAポリメラーゼIII (polIII) の転写におけるTAFsの役割は未確認のままでした.
研究 の 目的:
- ポリIII転写におけるTAFの要求と機能を調査する.
- ポリIII特異的転写に関与する新しいTAFを特定する.
- TAFがポリメラーゼ特異性を与えるメカニズムを解明する.
主な方法:
- HeLa TBPをフォスフォセルロース分数に分離する.
- TBPが欠乏したポリIIおよびポリIII転写反応におけるTBPの活性に対するアッセイ.
- 新型TAF,TAF-172およびTAF-L.の識別と特徴付け
主要な成果:
- 2つの新しいTAF,TAF-172とTAF-Lは,ポリIII転写に不可欠であると特定されました.
- TAF-172は,TATAボックスへのTBP結合を阻害することによって,ポリIII転写を活性化し,ポリII転写を抑制します.
- TBP-TAF-172-TAF-L複合体は,ポリIII転写においてTFIIIBを機能的に置き換える.
結論:
- Pol IIIの転写には,少なくとも2つの新しいTAF:TAF-172とTAF-L.が含まれています.
- TAFは,ポリメラーゼ特異性を授与する上で重要な役割を果たします.
- SL1,TFIID,およびTFIIIBは,それぞれポリ I,II,IIIの転写を指揮する機能的に類似したTBP-TAF複合体を表す可能性があります.
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