• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1992 Fiscal Year Final Research Report Summary

Experimental device designed for assay and purification of oxygen-sensitive enzymes and its application.

Research Project

Project/Area Number 02557070
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Functional basic dentistry
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

YAMADA Tadashi  Tohoku Univ., School of Dentistry, Prof., 歯学部, 教授 (50005021)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Nobuhiro  Tohoku Univ., School of Dentistry, Assistant Prof., 歯学部, 助手 (60183852)
IWAMI Yoshimiti  Tohoku Univ., School of Dentistry, Assistant Prof., 歯学部, 助手 (60005030)
ABBE Kazuhiko  Tohoku Univ., School of Dentistry, Associate Prof., 歯学部, 助教授 (40151089)
Project Period (FY) 1990 – 1992
KeywordsOxygen sensitive enzyme / Pyruvate formate-lyase / Strictly anaerobic conditions / Oral streptococci / Sugar metabolism / Anaerobic glove box / Enzyme assay / Actinomyces
Research Abstract

An anaerobic glove box, equipped with a purification apparatus and a spectorophotometer, was manufactured as a trial and employed. Several interesting finding were turned out as follows.
Pyruvate formate-lyase (PFL) plays an important role in anaerobic sugar metabolism in oral streptococci. PFL was extremely sensitive to oxygen, and assumed to contain a protein radical near a catalytic site. The reaction of molecular oxygen with the radical seemed to generate further harmful active oxygen and bring about irreversible inactivation of the enzyme rapidly. Reversible inactive form of the enzyme was oxygen torelant since it did not contain the radical, and could be activated by PFL-activating enzyme. Partially purified PFL activating enzyme was quite unstable, but incubation of the enzyme with ferrous ion, selenium ion, pterin, restored a part of the activity. The enzyme seemed to contain "a pterin like cofactor" which was assumed to be exist in xanthine oxidase. The activating enzyme of Streptococcus mutans was triggered by pyruvate, but not oxamate, and quite unstable. The properties of the streptococcal enzyme is considered different from that of Escherichia coli.
It is essential for plaque microorganisms to keep intracellular NADH/NAD balance under anaerobic conditions. Oral streptococci employed "the PFL system" to keep the balance. Lactobacilli metabolized acetate into ethanol to oxidize NADH to keep it. Actinomyces could regenerate NAD via succinate pathway when bicarbonate was available, and increased the rate of acid production.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] K.ABBE: "Oxygen and the sugar metabolism in oral streptococci." Proc.Finn.Dent.Soc.87. 477-487 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.TAKAHASHI: "Metabolism of intracellular polysaccharide in the cells of Streptococcus mutans under strictly anaerobic conditions." Oral Micobiol.Immunol.6. 299-304 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.ABBE: "Difference in conversion of pyruvate formate-lyase between oral streptococci." J.Dent.Res.70. 551 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.YAMADA: "Sugar metabolism of streptococci in dental plaque and in a test tube." J.Dent.Res.70. 650 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.IWAMI: "Acid productionby streptococci growing at low pH in a chemostat under anaerobic conditions." Oral Microbiol.Immunol.7. 304-308 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.TAKAHASHI: "Stimulatory effect of bicarbonate on the glycolysis of Actinomyces viscosus and its biochemical mechanism." Oral Microbiol.Immunol.7. 165-170 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Abbe: "Oxygen and the sugar metabolism in oral streptococci." Prof. Finn. Dent. Soc.87. 477-487 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Takahashi: "Metabolism of intracellular polysaccharide in the cells of Streptococcus mutans under strictly anaerobic conditions." Oral Micobiol. Immunol.6. 299-304 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Abbe: "Difference in conversion of pyruvate formate-lyase between oral streptococci." J. Dent. Res.70. 551 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Yamada: "Sugar metabolism of streptococci in dental plaque and in a test tube." J. Dent. Res.70. 650 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Iwami: "Acid production by streptococci growing at low pH in a chemostat under anaerobic conditions." Oral Microbiol. Immunol.7. 304-308 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Takahashi: "Stimulatory effect of bicarbonate on the glycolysis of Actinomyces viscosus and its biochemical mechanism." Oral Microbiol. Immunol.7. 165-170 (1992)

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

URL: 

Published: 1994-03-24  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi