Abstract
After treatment with NN-di[14C]methylnitrosamine, samples of DNA were isolated from rat livers by a conventional phenol procedure and examined for the presence of phosphotriesters. A method of capable of detecting relatively small amounts of 14C-labelled phosphotriesters was developed and used to establish that these products account for 10-12% of the total methylation pattern found after treatment with this agent in vitro. The significance of the presence of phosphotriesters in DNA is discussed.
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Selected References
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- BANDURSKI R. S., AXELROD B. The chromatographic identification of some biologically important phosphate esters. J Biol Chem. 1951 Nov;193(1):405–410. [PubMed] [Google Scholar]
- BROWN D. M., TODD A. R. Nucleic acids. Annu Rev Biochem. 1955;24:311–338. doi: 10.1146/annurev.bi.24.070155.001523. [DOI] [PubMed] [Google Scholar]
- Bannon P., Verly W. Alkylation of phosphates and stability of phosphate triesters in DNA. Eur J Biochem. 1972 Nov 21;31(1):103–111. doi: 10.1111/j.1432-1033.1972.tb02506.x. [DOI] [PubMed] [Google Scholar]
- Elmore D. T., Gulland J. M., Jordan D. O., Taylor H. F. The reaction of nucleic acids with mustard gas. Biochem J. 1948;42(2):308–316. [PMC free article] [PubMed] [Google Scholar]
- Gerchman L. L., Ludlum D. B. The properties of O 6 -methylguanine in templates for RNA polymerase. Biochim Biophys Acta. 1973 May 10;308(2):310–316. doi: 10.1016/0005-2787(73)90160-3. [DOI] [PubMed] [Google Scholar]
- Lawley P. D., Orr D. J., Shah S. A., Farmer P. B., Jarman M. Reaction products from N-methyl-N-nitrosourea and deoxyribonucleic acid containing thymidine residues. Synthesis and identification of a new methylation product, O4-methylthymidine. Biochem J. 1973 Sep;135(1):193–201. doi: 10.1042/bj1350193. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lawley P. D. Reaction of N-methyl-N-nitrosourea (MNUA) with 32P-labelled DNA: evidence for formation of phosphotriesters. Chem Biol Interact. 1973 Aug;7(2):127–130. doi: 10.1016/0009-2797(73)90022-7. [DOI] [PubMed] [Google Scholar]
- Lawley P. D., Shah S. A. Methylation of ribonucleic acid by the carcinogens dimethyl sulphate, N-methyl-N-nitrosourea and N-methyl-N'-nitro-N-nitrosoguanidine. Comparisons of chemical analyses at the nucleoside and base levels. Biochem J. 1972 Jun;128(1):117–132. doi: 10.1042/bj1280117. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lawley P. D., Thatcher C. J. Methylation of deoxyribonucleic acid in cultured mammalian cells by N-methyl-N'-nitro-N-nitrosoguanidine. The influence of cellular thiol concentrations on the extent of methylation and the 6-oxygen atom of guanine as a site of methylation. Biochem J. 1970 Feb;116(4):693–707. doi: 10.1042/bj1160693. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ludlum D. B. Ethylation of polyadenylic acid. Biochim Biophys Acta. 1969 Feb 18;174(2):773–775. doi: 10.1016/0005-2787(69)90311-6. [DOI] [PubMed] [Google Scholar]
- Ludlum D. B. Methylated polydeoxyribocytidylic acid templates for RNA polymerase. Biochim Biophys Acta. 1971 Oct;247(3):412–418. doi: 10.1016/0005-2787(71)90027-x. [DOI] [PubMed] [Google Scholar]
- Margison G. P., Capps M. J., O'Connor P. J., Craig A. W. Loss of 7-methylguanine from rat liver DNA after methylation in vivo with methylmethanesulphonate or dimethylnitrosamine. Chem Biol Interact. 1973 Feb;6(2):119–124. doi: 10.1016/0009-2797(73)90078-1. [DOI] [PubMed] [Google Scholar]
- O'Connor P. J., Capps M. J., Craig A. W. Comparative studies of the hepatocarcinogen N,N-dimethylnitrosamine in vivo: reaction sites in rat liver DNA and the significance of their relative stabilities. Br J Cancer. 1973 Feb;27(2):153–166. doi: 10.1038/bjc.1973.19. [DOI] [PMC free article] [PubMed] [Google Scholar]
- O'Connor P. J., Capps M. J., Craig A. W., Lawley P. D., Shah S. A. Differences in the patterns of methylation in rat liver ribosomal ribonucleic acid after reaction in vivo with methyl methanesulphonate and NN-dimethylnitrosamine. Biochem J. 1972 Sep;129(3):519–528. doi: 10.1042/bj1290519. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shooter K. V., Howse R., Merrifield R. K. The reaction of alkylating agents with bacteriophage R17. Biological effects of phosphotriester formation. Biochem J. 1974 Feb;137(2):313–317. doi: 10.1042/bj1370313. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shooter K. V., Howse R., Shah S. A., Lawley P. D. The molecular basis for biological inactivation of nucleic acids. The action of methylating agents on the ribonucleic acid-containing bacteriophage R17. Biochem J. 1974 Feb;137(2):303–312. doi: 10.1042/bj1370303. [DOI] [PMC free article] [PubMed] [Google Scholar]
- TOMLINSON R. V., TENER G. M. THE EFFECT OF UREA, FORMAMIDE, AND GLYCOLS ON THE SECONDARY BINDING FORCES IN THE ION-EXCHANGE CHROMATOGRAPHY OF POLYNUCLEOTIDES OF DEAE-CELLULOSE. Biochemistry. 1963 Jul-Aug;2:697–702. doi: 10.1021/bi00904a013. [DOI] [PubMed] [Google Scholar]