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Ligand-incorporation site in 5-methylcytosine-detection probe modulating the site of osmium complexation with the target DNA
Authors:Kaori Sugizaki  Akiko Nakamura  Hiroyuki Yanagisawa  Akimitsu Okamoto
Institution:Nucleic Acid Chemistry Laboratory, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan (phone: +81-48-467-9238; fax: +81-48-467-9205).
Abstract:ICON Probes, short DNA strands containing an adenine linked to a bipyridine ligand, formed an interstrand cross-link with 5-methylcytosine located opposite the modified adenine in the presence of an osmium oxidant. The location of a bipyridine-tethered adenine in the probes varied the selectivity of the reactive base. An ICON probe where the modified adenine was located at the probe center showed a 5-methylcytosine-selective osmium complexation, whereas an ICON probe with the modified adenine at the strand end exhibited high reactivity towards thymine as well as 5-methylcytosine. The modulation of reactive bases by the incorporation of a bipyridine-tethered adenine site made facilitates design of ICON probes for the fluorometric detection of 5-methylcytosine.
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