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Nucleic Acids Research, 1987, Vol. 15, No. 8 3455-3468
© 1987

Articles

Effects of VM26 (teniposide), a specific inhibitor of type II DNA topoisomerase, on SV40 DNA replication in vivo

Arndt Richter, Ulrich Strausfeld and Rolf Knippers

Fakultat für Biologie, Universität Konstanz, D-7750 Konstanz, FRG

Received February 12, 1987. Accepted March 20, 1987.

Simian Virus 40 (SV40) infected cells were pulse labeled with (3H) thymidine and chased either in the absence or in the presence of the cytotoxic drug VM26 (teniposide). We investigated the structure of labeled SV40 DNA and found that VM26 had no significant effect on replicative chain elongation but strongly inhibited the conversion of late replication intermediates to mature DNA daughter molecules. The late replicative SV40 DNA intermediates which accumulate in VM26 treated cells contained essentially full length labeled DNA strands. These newly synthesized strands were not part of two catenated interlocked SV40 monomers suggesting that the block occured prior to the final ligation reaction. Since VM26 is known to be a specific inhibitor of DNA topoisomerase II we conclude that this enzyme is dispensable for the chain elongation of replicating SV40 DNA, but that it is essential for the termination of SV40 DNA replication cycles.


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