闭环DNA closed circular DNA

互联网2013-11-14

1324

没有断口的双链环状 DNA，亦称为超螺旋 DNA。由于具有螺旋结构的双链各自闭合，结果使整个 DNA分子进一步旋曲而形成三级结构。另外如果一条或二条链的不同部位上产生一个断口，就会成为无旋曲的开环 DNA分子。从细胞中提取出来的质粒或病毒 DNA都含有闭环和开环这二种分子。可根据两者与色素结合能力的不同，而将两者分离开来。

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