Effects of the antitumor drug VP16 (etoposide) on the archaebacterialHalobacteriumGRB 1.7kb plasmidin vivo

Abstract
The topoprofile of 1.7 kb plasmids from the archaebacterium Halobacterium GRB was analysed from cells growing with or without VP16 (etoposide). This drug interferes with the breakage-reunion reaction of eukaryotic DNA topoisomerase II by inhibiting the ligase activity of this enzyme.