Eukaryotic DNA topoisomerase I (topo I) is a protein that reduces the strain from the supercoils that are caused during transcription and translation[1]. There are two types of topoisomerases. Type 1 topoisomerases are monomeric and break one strand of DNA[2]. Type 2 topoisomerases are dimeric, meaning that they made up of two units and break both strands of the DNA helix. They are able to pass another part of the duplex through the cut, and close the cut using ATP[3].
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Structural highlights
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