| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Research Abstract |
One of the most common problems accompanied with non-phosphorus, electroneutral DNA analogues is the low solubility of the oligomers. Despite the chemical and biological stability benefitted from the absence of the negatively charged phosphate linkages, the electroneutral strand lacks electrostatic supports for the solubility. This solubility issue also arose, when we prepared long oligomers of TLDNA. Specifically, unique functions of TLDNA congeners such as lure substrates for reverse-transcriptase prompted us to explore further applications with longer oligomers, but the solubility problem became severer as the oligomers lengthened. We reported a concise post-modification method for the preparation of positively charged variants, TLDNA+. A one-step methylation of oligothymine TLDNA successfully afforded TLDNA+ with an improved solubility in high yield. The pentamer TLDNA+ formed a triple helix with natural oligoadenine DNA in addition to a mercury-mediated self-duplex.
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