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Encyclopedia > Topoisomer

Topoisomers or topological isomers are molecules with the same chemical formula but different topologies. Examples of molecules for which there exist topoisomers include DNA, which can form knots, and catenanes. DNA topoisomers can be interchanged by enzymes called topoisomerases.


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RedOrbit - Science - Bulge Defects Do Not Destabilize Negatively Supercoiled DNA (1535 words)
Distinct topoisomer populations of covalently closed, bulge- containing plasmids were prepared by ligation in the presence of different concentrations of ethidium.
The signature for such structural transitions is a discontinuity in the are of topoisomer bands, commonly seen in plasmids containing sequences that undergo transitions to the Z- form or cruciform structures (6).
There are well-defined, arc-shaped patterns of topoisomers in all cases, indicating the absence of sharp, supercoiling-dependent secondary- structure transitions.
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