Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 74, Issue 6, Pages 2350-2356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo802556s
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Funding
- JSPS [16590024, 17790024]
- MEXT (Ministry of Education, Sciences, Sports and Culture)
- Cancer Research UK
- Grants-in-Aid for Scientific Research [16590024, 17790024] Funding Source: KAKEN
- Biotechnology and Biological Sciences Research Council [B17092] Funding Source: researchfish
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The synthesis of a novel C4-linked C-2-imidazole ribonucleoside phosphoramidite (ICN-C-2-PA 1) with a two-carbon linker between imidazole and ribose moieties is described. In the phosphoramidite, POM and 2-cyanoethyl groups were selected to protect the endocyclic amine function of imidazole and the 2'-hydroxyl function of D-ribose, respectively. The C-2-imidazole nucleoside, a flexible structural mimic of a purine nucleobase, was successfully incorporated using ICN-C-2-PA 1 into position 638 of the VS ribozyme through 2'-TBDMS chemistry to study the role of G638 in general acid-base catalysis. The modified VS ribozyme (G638C(2)Imz) exhibited significantly greater catalytic activity than observed with the C-0-imidazole that has no carbon atoms linking the ribose and the C4-imidazole. Imidazole nucleoside analogues with variable spacer lengths could provide a valuable general methodology for exploring the catalytic mechanisms of ribozymes.
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