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Partial purification and characterization of two types of homologous DNA pairing activity from rat testis nuclei

机译:从大鼠睾丸核中部分纯化和表征两种类型的同源DNA配对活性

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We describe the partial purification and characterization of two different types of homologous DNA pairing activity from rat testis nuclear extracts. The activities are separated from each other by single-stranded DNA-cellulose affinity chromatography. One activity requires single-stranded DNA ends and promotes the homologous pairing of singie-stranded DNA fragments with double-stranded circular DNA and has an apparent molecular mass of 100 kDa as determined by gel filtration chromatography. This pairing activity does not require the addition of exogenous ATP and is strongly Mg2+-dependent. The second pairing activity promotes strand-transfer between single-stranded circular DNA and homologous double-stranded DNA fragments and has an apparent molecular mass of 30 kDa as determined by gel filtration chromatography. This pairing activity also does not require ATP but, in contrast to the former, is Mg2+-independent.
机译:我们描述从大鼠睾丸核提取物的两种不同类型的同源DNA配对活性的部分纯化和表征。活性通过单链DNA-纤维素亲和色谱分离。一种活性需要单链DNA末端,并促进单链DNA片段与双链环状DNA的同源配对,并且通过凝胶过滤色谱法测定其表观分子量为100 kDa。这种配对活性不需要添加外源ATP,并且强烈依赖于Mg2 +。第二配对活性促进单链环状DNA和同源双链DNA片段之间的链转移,并且通过凝胶过滤色谱法测定的表观分子量为30kDa。这种配对活性也不需要ATP,但与前者相反,它是Mg2 +独立的。

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