Topoisomerase
Bacheller Biology
Topoisomerase
 
Ribbon model of a Class I Topoisomerase molecule (PDB ID 1a31) relaxing overwound DNA (purple).   Secondary structures alpha-helices are shown as red and beta-pleated sheets are shown as green.
 
Topoisomerases are a class of protein that resolve the mechanical stress in DNA molecules that is caused by winding or unwinding of the DNA.
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