负超螺旋
fù chāo luó xuán
- 名negative superhelix
负超螺旋-
DNA旋转酶是类型Ⅱ拓扑异构酶的一种，也是唯一能够引入负超螺旋的拓扑异构酶。
DNA gyrase is the only topoisomerase that is able to introduce negative supercoils into DNA .
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DNA回旋酶是细菌特有的一种拓扑异构酶，它能够利用ATP水解的能量将共价闭合环状DNA转变为负超螺旋DNA，从而维持细菌体内正常的超螺旋水平。
DNA gyrase is an essential bacterial topoisomerase that catalyzes the ATP dependent negative supercoiling of double stranded closed circular DNA .
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Polyd（GC）在负超螺旋下形成的Z-DNA
Formation of Z-DNA in Poly d ( GC ) in the Presence of Negatively Supercoil