| Project/Area Number |
12672150
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
医薬分子機能学
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| Research Institution | GIFU UNIVERSITY |
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Principal Investigator |
KITADE Yukio GIFU UNIVERSITY FACULTY OF ENGINEERING PROFESSOR, 工学部, 教授 (20137061)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANISHI Masayuki GIFU UNIVERSITY FACULTY OF ENGINEERING RESEARCH ASSOCIATE, 工学部, 教授 (00281048)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | 2-5A system / interferon / Rnase L / 2-5A-antisense chimera / antisense / anti-viral drug / RNaseL / 抗ウイルス作用 |
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| Research Abstract |
Antisense oligonucleotides have been applied extensively for the regulation of cellular and viral gene expression. They hybridize to mRNA targets through Watson-Crick base-pairing and inhibit the translation of mRNA in a sequence-specific manner. On the other hand, a small oligoadenylate containing unique 2',5'-phosphodiester bonds, known as 2-5A, plays a key role in mediating the antiviral effect of interferon. Rnase L, an enzyme found in many eukaryotic cells, is allosterically activated by 2-5A.
Few studies were documented to reveal the structure-activity relationship in Rnase L activation by 2-5A derivatives. However, a direct comparison of the potency of these derivatives is not easily made due to the diversity of assay methods. We have now developed a facile method for assaying the activity of Rnase L by the use of non-fusion Rnase L expressed in E. coli and yeast 5S ribosomal RNA as a substrate. These results suggest that modification at the 8-position in the third adenine ring of 2-5A molecule effectively brings about dimerization of Rnase L.
We have also reported the synthesis of 8-methyladenosine-containing 2-5 A tetramers and the corresponding antisense chimeras with hydroxyalkyl groups at 5'-phosphates. The phosphates-resistant property and the ability of these oligonucleotides to activate recombinant human Rnase L were studied. The enzyme activated by the 2-5A-antisense chimera, which had the hydroxyethyl group and 8-methyladenosine, cleaved the complementary RNA as efficiently as that activated by the 2-5A-antisense chimera without the hydroxyethyl group and 8-methyladenosine. Thus, the 2-5A-antisense chimera carrying the hydroxyethyl and 8-methyladeosine will be a candidate for novel antisense molecule.
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