Partially purified preparations of O6-alkylguanine-DNA alkyltransferase from rat liver and E. coli were tested for their ability to repair O4-methylthymine in a methylated poly(dT).poly(dA) substrate. The bacterial preparation readily carried out this reaction, but no loss of O4-methylthymine was obtained with the rat liver protein. These results indicate a significant difference in specificity between the mammalian and bacterial proteins which could have important consequences for carcinogenesis and mutagenesis by a alkylating agents in mammalian cells.
|Original language||English (US)|
|Number of pages||7|
|Journal||Biochemical and Biophysical Research Communications|
|State||Published - Aug 30 1984|
All Science Journal Classification (ASJC) codes
- Molecular Biology
- Cell Biology