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Topoisomerase


Topoisomerase
An enzyme which introduces or removes overwinding or underwinding of the DNA circular duplex by causing a nick, rotating the strands, and then ligating them.
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Topoisomerase: An enzymatic activity responsible for relieving excessive supercoiling in DNA.
Trans-: Located on two physically dis-contiguous DNA molecules.
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A topoisomerase, which introduces negative supercoils into the DNA in order to minimize tortional strain induced by the unwinding of the DNA by helicase. This prevents the DNA from knotting up.
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A topoisomerase that relieves supercoiling in DNA by creating a transient break in the double helix.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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The topoisomerases in eukaryotes are not affected.
Polypeptides
The most common of these are the polymixins.
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-tomy cut topoisomerases Enzymes that introduce positive or negative supercoils in closed, circular duplex DNA. toxins Proteins produced by some organisms and toxic to some other species.
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The addition of ThermoFidelase 2 with its unique combination of topoisomerase and DNA binding activities is used to shorten the cycles of denaturation and primer annealing.
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The task of unknotting topologically linked strands of DNA falls to enzymes known as topoisomerases. Some of these enzymes unknot circular DNA by cleaving two strands so that another double-stranded segment can pass through.
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The cohesion must be destroyed at anaphase of mitosis and of meiosis II.
Daughter DNA strand intertwining can be one explanation of sister chromatid cohesion. Other factors may also be responsible for cohesion. Topoisomerases play important roles ...
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