6-Thioguanine alters the structure and stability of duplex DNA and inhibits quadruplex DNA formation

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6-Thioguanine alters the structure and stability of duplex DNA and inhibits quadruplex DNA formation.

The ability to chemically synthesize biomolecules has opened up the opportunity to observe changes in structure and activity that occur upon single atom substitution. In favorable cases this can provide information about the roles of individual atoms. The substitution of 6-thioguanine (6SG) for guanine is a potentially very useful single atom substitution as 6SG has optical, photocrosslinking, ...

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Effect of 6-thioguanine on the stability of duplex DNA

The incorporation of 6-thioguanine (S6G) into DNA is a prerequisite for its cytotoxic action, but duplex structure is not significantly perturbed by the presence of the lesion [J. Bohon and C. R. de los Santos (2003) Nucleic Acids Res., 31, 1331-1338]. It is therefore possible that the mechanism of cytotoxicity relies on a loss of stability rather than a pathway involving direct structural reco...

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Effect of 6-Thioguanine and Methyl-6-Thioguanine on stability of DNA duplexes

6-Thioguanine (isG) has been used for the past thirty years as an anti-cancer agent in maintenance chemotherapy for childhood acute lymphoblastic leukemia as well as acute myeloid leukemia. Despite its long-standing clinical use, little is understood of the molecular basis of the cytotoxicity associated with 6SG. Research has shown that 6SG is incorporated into DNA during replication after whic...

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ژورنال

عنوان ژورنال: Nucleic Acids Research

سال: 1999

ISSN: 1362-4962

DOI: 10.1093/nar/27.14.2860