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DNA interstrand crosslinking and sequence selectivity of dimethanesulphonates.
M Ponti1, R L Souhami, B W Fox
1Department of Oncology, University College and Middlesex School of Medicine, London, UK.
British Journal of Cancer
|May 1, 1991
Summary
Alkanediol dimethanesulphonates show varied DNA crosslinking and alkylation. Methylene dimethanesulphonate (MDMS) exhibits unique guanine-N7 alkylation selectivity, distinct from its hydrolysis products.
Area of Science:
- Molecular Biology
- Medicinal Chemistry
- Genetics
Background:
- Alkanediol dimethanesulphonates are a class of compounds with potential DNA-interactive properties.
- Understanding their DNA crosslinking and alkylation capabilities is crucial for drug development.
Purpose of the Study:
- To investigate the DNA interstrand crosslinking efficiency of alkanediol dimethanesulphonates.
- To determine the DNA sequence selectivity of guanine-N7 alkylation by these agents.
- To compare the reactivity of different chain lengths within this homologous series.
Main Methods:
- DNA crosslinking gel assay to measure interstrand crosslink formation.
- Modified DNA sequencing techniques to assess guanine-N7 monoalkylation.
- Analysis of hydrolysis products' contributions to DNA damage.
Main Results:
- 1,6-hexanediol dimethanesulphonate (Hexa-DMS) showed the highest interstrand crosslinking efficiency, followed by methylene dimethanesulphonate (MDMS), 1,8-octanediol dimethanesulphonate (Octa-DMS), and Busulphan.
- Busulphan induced significantly more guanine-N7 monoalkylation than Hexa-DMS and Octa-DMS.
- MDMS and its hydrolysis product methanesulphonic acid (MSA) demonstrated a highly specific guanine reaction site in a G-rich sequence, independent of non-specific depurination.
Conclusions:
- Structurally similar alkylating agents exhibit distinct DNA monoalkylation and interstrand crosslinking profiles.
- MDMS and MSA possess a notable selectivity for guanine modification, offering potential for targeted therapeutic applications.