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Generation and Reactivity of DNA Cleaving Agents

Research Project

Project/Area Number 10480149
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Bioorganic chemistry
Research InstitutionNagoya University

Principal Investigator

KIGOSHI Hideo  Nagoya University, Research Center for Materials Science, Associate Professor, 物質科学国際研究センター, 助教授 (90169839)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1999: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1998: ¥5,300,000 (Direct Cost: ¥5,300,000)
KeywordsDNA cleavage / DNA alkylation / Bracken fern / Alga
Research Abstract

Recently, reactions of natural products and their derivations toward DNA have been actively investigated. These researches provide molecular recognition of organic compounds toward DNA as well as structures and functions of DNA. Furthermore, this knowledge provides not only molecular mechanism of antitumor agents targetting DNA but also fundamental information to the cancer research.
Ptaquiloside is a potent carcinogenic compound isolated from the bracken fern Pteridium aquilinum var. latiusculum. The bracken ultimate carcinogen generated from under weakly basic conditions acts as a powerful alkylating agent toward amino acids and nucleic acid bases, and causes cleavage of DNA. Using deoxytetranucleotide d(GTAC), we disclosed the molecular mechanism of DNA cleavage with the ultimate carcinogen : i) the bracken ultimate carcinogen forms covalent adducts through N-3 of adenin or N-7 of guanine in DNA with opening of the cyclopropane ring, ii) spontaneous cleavage of the N-glycosidic linkage occurs primarily at the modified adenines to produce abasic sites, and iii) the abasic sites are so unstable that subsequent backbone breakage occurs via a b-elimination reaction.
We designed and synthesized simpler analogs of the bracken ultimate carcinogen, and found that these analogd are much more stable than the bracken ultimate carcinogen and possesses DNA cleaving activity comparable to that of the bracken ultimate carcinogen.
A tribromoacetamide, isolated from a marine alga, exhibits a growth-inhibitory against a marine bacterium with an adhering property. We have found that tribromoacetamides have cytotoxicity, and studied of structure-cytotoxicity relationships. Furthermore, tribromoacetamides proved to be an inhibitor of tubulin-polymerization.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] K. Yamada, M. Ojika, H. Kigoshi: "Isolation, Chemistry, and Biochemistry of Ptaquiloside, a Bracken Carcinogen"Angewandte Chemie International Edition English. 37・13/14. 1818-1826 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 山田、小鹿、木越、杉浦: "わらび発癌物質:化学研究とDNA修飾"蛋白質核酸酵素. 43・6. 752-761 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kiyoshi Yamada, Makoto Ojika, and Hideko Kigoshi: "Isolation, Chemistry, and Biochemistry of Ptaquiloside, a Bracken Carcinogen"Angew. Chem. Int. Ed. Engl.. 37(13/14). 1818-1826 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Bracken Carcinogen: "Chemical Studies and DNA Modification"Tanpakusitu, Kakusann, Kouso. 43(6). 752-761 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Yamada, M.Ojika, H.Kigoshi: "Isolation, Chemistry, and Biochemistry of Ptaquiloside, a Bracken Carcinogen"Angewandte Chemie International Edition English. 37・13/14. 1818-1826 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 山田,小鹿,木越,杉浦: "わらび発癌物質:化学研究とDNA修飾"蛋白質核酸酵素. 43・6. 752-761 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Yamada: "Isolation,Chemistry,and Biochemistry of Ptaquiloside,A Bracken Carcinogen" Angew.Chem.,Int.Ed.Engl.37・14/15. 1818-1826 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 山田静之: "わらび発癌物質:化学研究とDNA修飾" 蛋白質核酸酵素. 43・6. 752-761 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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