## Abstract In this report we show that human DNA Topoisomerase I (Top1) forms DNAβprotein adducts with nicked and gapped DNA structures lacking a conventional Top1 cleavage site. The radioactively labeled crosslinking products were identified by SDSβgel electrophoresis. The chemical structure of t
DNA topoisomerases and DNA repair
β Scribed by C. S. Downes; R. T. Johnson
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 923 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0265-9247
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β¦ Synopsis
Sum ma ry
DNA topoisomerases are enzymes that can modify, and may regulate, the topological state of DNA through concerted breaking and rejoining of the DNA strands. They have been believed to be directly involved in DNA excision repair, and perhaps to be required for the control of repair as well. The vicissitudes of this hypothesis provide a noteworthy example of the dangers of interpreting cellular phenomena without genetic informatior and vice versa. are with the Cancer Research Campaign Mammalian Cell DNA Repair Group,
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Sporadic breast carcinomas demonstrate microsatellite instability, reflecting the presence of DNA mismatch repair-deficient cells, in about one fourth of cases at the time of diagnosis. Loss of DNA mismatch repair has been reported to result in resistance not only to cisplatin and alkylating agents