catalytic activity:ATP-independent breakage of single-stranded DNA, followed by passage and rejoining.,cofactor:Divalent metal ions (calcium or magnesium).,function:Relieves DNA strain that arise during duplication of mitochondrial DNA.,miscellaneous:When a topoisomerase transiently breaks a DNA backbone bond, it simultaneously forms a protein-DNA link, in which a tyrosyl oxygen in the enzyme is joined to a DNA phosphorus at one end of the enzyme-severed DNA strand.,similarity:Belongs to the eukaryotic type I topoisomerase family.,tissue specificity:Ubiquitous; highest in skeletal muscle, heart, brain and fetal liver.,
Mitochondrion .
Ubiquitous; highest in skeletal muscle, heart, brain and fetal liver.
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