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文献和实验能识别TATA盒并与其结合的转录因子,是三种RNA聚合酶转录时都需要的;其他称为TBP相关因子(TBP�associated factors TAF),至少包括8种能与TBP紧密结合的因子。转录前先是TFⅡ-D与TATA盒结合;继而TFⅡ-B以其C端与TBP-DNA复合体结合,其N端则能与RNA聚合酶Ⅱ亲和结合,接着由两个亚基组成的TFⅡ-F加入装配,TFⅡ-F能与RNA聚合酶形成复合体,还具有依赖于ATP供给能量的DNA解旋酶活性,能解开前方的DNA双螺旋,在转录链延伸中起作用。这样,启动子序列
Purification of Sequence‐Specific DNA‐Binding Proteins by Affinity Chromatography
chromatography is a very effective and straightforward means of purifying a protein based on its sequence?specific DNA?binding properties. The affinity chromatography procedure described in this unit uses DNA containing specific recognition sites for the desired
in vivo. Science 288:1244‐1248. Li, X.‐Y., Virbasius, A., Zhu, X., and Green, M.R. 1999. Enhancement of TBP binding by activators and general transcription factors. Nature 399
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