An Associative Novel Two-Metal-Ion Mechanism for Type Ⅱ Topoisomerases Supported by QM/MM and QTCP S

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  Type Ⅱ topoisomerase catalyzes the relaxation of supercoiled DNA by transient cleavage and rejoining of both DNA helixes.However,the catalysis employing a combination of nucleobase and divalent metal ions has been in dispute for years.
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