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1997 Fiscal Year Final Research Report Summary

MOLECULAR DESIGN OF NEW EFFECTIVE ANTISENSE NUCLEIC ACIDS CAPABLE OF HYBRIDIZATION TO THE TARGET NENES

Research Project

Project/Area Number 07408014
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Bioorganic chemistry
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

SEKINE Mitsuo  TOKYO INSTITUTE OF TECHNOLOGY,FACULTY OF BIOSCIENCE AND BIOTECHNOLOGY,ASSOCIATE PROFESSOR, 生命理工学部, 助教授 (40111679)

Co-Investigator(Kenkyū-buntansha) WADA Takeshi  TOKYO INSTITUTE OF TECHNOLOGY,FACULTY OF BIOSCIENCE AND BIOTECHNOLOGY,DEPARTMENT, 生命理工学部, 助手 (90240548)
Project Period (FY) 1995 – 1997
KeywordsANTISENCE NUCLEIC ACID / CONFORMATION / 3'-ENDO / CYCLOURIDYLIC ACID / INTRAMOLECULAR CYCLIZATION / MOLECULAR MECHANICS / SOLID PHASE SYNTHESIS / DUPLEX FORMATION
Research Abstract

A 2'-O-methyluridylic acid derivative having a cyclic structure linked between the 5-position of the uracil residue and the 5'-phosphate group was synthesized. The NMR analysis of suggests that this cyclouridylic acid derivative has exclusively the C3'-endo conformation which is in favor of duplex formation with RNA.Two oligonucleotides [pc3Um(pT)_9 and pc3Um(pU)_9]incorporating this cyclouridylic acid unit at the 5'-terminal site were synthesized by using the fully protected cyclouridylic acid 3'-phosphoramidite derivative in the solid phase synthsis. To examine the actual effect of this cyclic structure on the thermal stability of duplexes between the modified oligonucleotides and their complementary oligonucleotides, two oligonucleotides [pUm(pT)_9 and pUm(pU)_9] having an acyclic structure were also synthesized. As the complementary oligonucleotides, dA(pdA)_9 and A(pA)_9 were used for Tm experiments with these 5'-terminal modified oligonucleotides. The Tm values of all possible duplexes were measured. These results clearly show that there the duplex of A(pA)_9/pc3Um(pT)_9 has a higher Tm value by 5.5゚C than that of A(pA)_9/T(pT)_9. This is rather significant compared with all other cases. Moreover, the Tm value of A(pA)_9/pc3Um(pT)_9 is 4.5゚C higher than that of A(pA)_9/pUm(pT)_9. This result suggests that the cyclic structure can considerably contribute to stabilization of the duplex only in the case of the modified oligomer (DNA) and decaadenylate (RNA).

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Wada, Y.Sato, F.Honda, S.Kawahra, M.Sekine: "Chemical Synthesis of Oligodeoxyribonucleotides Using N-Unprotected H-Phosphonate Monomers and Carbonium and Phosphoniun Condensing Reagents" Journal of American Chemical Society. 119・52. 12710-12721 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Tsuruoka, K.Shohda, T.Wada, M.Sekine: "Kinetics and Mechanism of Facile and Selective Dephosphorylation of 2'-Phosphorylated and 2'-Thiophospylated Dinucleotides" Journal of Organic Chemistry. 62・9. 2813-2822 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Seio, T.Wada, k.Sakamoto, S.Yokoyama, M. Sekine: "Chemical Synthesis and Properties of Conformationaliy Fixed Diuridine Monophosphates as Building Blocks of RNA Turn Motif" Journal of Organic Chemistry. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kadokura, T.Wada, C.Urashima, M.Sekine: "Effective Synthesis of γ-Methyl-Capped Guanosine 5'-Trphosphate as a 5'-Terminal Unique Structure of U6 RNA vi a New Triprosphate Bond Formation" Tetrahedron Letters. 38・48. 8359-8362 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Wada, F.Honda, Y.Seto, S.Kawahara, M.Sekine: "Chemical Synthesis of H-Phosphonate DNA without Using N-Protecting Groups" Nucleic Acids Symposium Series. 37. 19-20 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Seio, O.Kurasawa, T.Wada, M.Sekine, et al.: "Synthesis and Properties of Conformationally Rigid Cyclouridylic Acids Having Covalent Bond Between the Uracil 5-position and the 5'-Phosphate Group" Nucleoside Nucleotides. 16・7-9. 1023-1032 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Wada, Y.Sato, F.Honda, S.Kawahara, and M.Sekine: "Chemical Synthesis of Oligodeoxyribonucleotides Using N-Unprotected H-Phosphonate Monomers and Carbonium and Phosphonium Condensing Reagents : O-Selective Phosphonylation and Condensation." J.Am.Chem.Soc.119. 12710-12721 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tsuruoka, K.Shohda, T.Wada, and M.Sekine: "Kinetics and Mechanism of Facile and Selective Dephosphorylation and of 2'-Phosphorylated and 2'-Thiophosphorylated Dinucleotides : Neighboring 3'-5'Phosphodiester Promotes 2'-Dephosphorylation." J.Org.Chem.92. 2813-2822 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Seio, T.Wada, K.Sakamoto, S.Yokoyama, and M.Sekine: "Chemical Synthesis and Properties of Conformationally Fixed Diuridine Monophosphates as Building Blocks of RNA Tum Motif." J.Org.Chem.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kadokura, T.Wada, C.Urashima, and M.Sekine: "Efficient Synthesis of g-Methyl-Capped Guanosine 5'-Triphosphate as a 5'-Terminal Umique Structure of U6 RNA via a New Triphosphate Bond Formation Involving Activation of Methyl Phosphorimidazolidate Using ZnCl2 as a Catalyst in DMF under Anhydrous Conditions." Tetrahedron Lett.38. 8359-8362 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Wada, F.Honda, Y.Satoh, S.Kawahara, and M.Sekine: "Chemical Synthesis of H-Phosphonate DNA without Using N-Protecting Groups." Nucleic Acids Symp.Ser., 37. 19-20 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Wada, N.Kobayashi, T.Mori, and M.Sekine: "Stereocontrolled Synthesis of Dithymidine Phosphorothioates by Use of a Functionalized 5'-Protecting Group Bearing an Imidazole Residue." Nucleosides Nucleotides. 16. 1023-1032 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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