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2001 Fiscal Year Final Research Report Summary

Structure and Function of heme related proteins involved in intracellular signal transduction

Research Project

Project/Area Number 12480176
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural biochemistry
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

IKEDA-SAITO Masao  Tohoku University, Institute for Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (70302239)

Co-Investigator(Kenkyū-buntansha) TOMITA Takeshi  Institute for Multidisciplinaiy Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (20302242)
FUJII Hiroshi  Okazaki National Research Institutes, Center for Integrative Bioscience, Associate Professor, 統合バイオサイエンスセンター, 助教授 (80228957)
SHIRO Yoshitsugu  Riken, Biophysical Chemistry Laboratory, Chief Scientist, 生体物理化学研究室, 主任 (70183051)
MATSUI Toshitaka  Institute for Multidisciplinary Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (90323120)
HIROTSU Shoko  Institute for Multidisciplinary Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (50333901)
Project Period (FY) 2000 – 2001
Keywordsheme oxygenase / heme / X-ray crystal structure / resonance Raman spectra / intermediate of enzyme reaction
Research Abstract

In this work, we studied about heme oxygenase, a heme degradation enzyme. First, our research project was focused on constitutive isoform of mammalian heme oxygenase, HO-2. Recombinant HO-2 overexpressed in E colli. was successfully purified with new method to exclude impurity such as degradated or denatured enzymes. We used this highly purified HO-2 for crystal screening to search an appropriate buffer condition of crystallization, but we could not find the condition. On the other hand, we had already made crystal of HmuO, a bacterial heme oxygenase, and tried to elucidate crystal structure of HmuO. On the basis of spectroscopic data, optical absorption and resonance Raman spectra, and enzymological analysis of HO-2 and HmuO, their heme environment and reaction mechanism were found to be identical to those of HO-1 , inducible form of mammalian heme oxygenase. X-ray crystal structure analysis revealed that the crystal of HmuO belonged to P21 space group and a unit cell of the crystal was composed of three molecules. We could reveal structure of oxidized form and reduced form, the first and second intermediate of the enzyme reaction. The reduced form of crystal was made by the addition of sodium dithionite as an electron donor to the oxidized form crystal. Resolutions of the crystal structures were 1.4 and 1.7 angstroms for oxidized form and reduced form, respectively. From the comparison of crystal structures in oxidized and reduced forms, substantial amount of structural changes provoked by changing of heme iron electronic state were discovered for the first time. Additionally, presence of an hydrogen bonding network, which is assumed to work as a proton donor in the heme-degradation reaction, was pointed out here. Now our efforts are thrusting to realize the structure of CO adduct of HmuO as well as other intermediate, alpha-hydroxyheme form, verdoheme form, and billiverdin form.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Fujii, H., Tomita, T., Ikeda-Saito, M.他2名: "A Role for highly conserved carboxylate, Aspartate-140, in oxygen activation and heme degradation by heme oxygenase-1"J.Am.Chem.Soc. 123. 6475-6484 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tomita, T.他8名: "Elucidation of the differences between the 430 and 455-nm absorbing forms of P450-isocyanide adducts by resonance Raman spectroscopy"J.Biol.Chem.. 276. 36261-36267 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tomita, T., Ikea-Saito, M.他3名: "UV resonance Raman detection of a ligand vibration on ferric nitrosyl heme proteins"J.Am.Chem.Soc. 123. 2666-2667 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chu, G.C., Ikeda-Saito, M.他3名: "Axial ligation state of five-coordinate heme oxygenase proximal histidine mutants, as revealed by EPR and resonance Raman spectroscopy"J.Am.Chem.Soc. 122. 12612-12613 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lesnefsky, E.J., Ikeda-Saito M.他5名: "Ischemic injury to mitochondrial electron transport in the aging heart : Damage to the iron-sulfur protein subunit of electron transport complex III"Arch.Biochem.Biophys.. 385. 117-128 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lesnefsky, E.J., Ikeda-Saito M.他5名: "Aging decreases electron transport complex III activity in heart interfibrillar mitochondria by alteration of the cytochrome c binding site"J.Mol.Cell Cardiol. 33. 37-47 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 冨田 毅 (吉村哲彦 編): "生体内一酸化窒素(NO)実験プロトコール"共立出版. 288 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Fujii, T. Tomita, Ikeda-Saito, et al: "A Role for highlu Conserved carboxylate, Aspartate-140, in oxygen activation and heme degradation by heme oxtgenase-1."J. Am. Chem. Soc.. Vol. 123. 6475-6484 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Tomita et al: "Elucidation of the differences between the 430 and 455-m, absorbing forms of p450-isocyanide adducts by resonance Raman spectroscopy."J. Biol. Chem.. Vol. 276. 36261-36267 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Tomita, Ikeda-Saito et al: "UV resonance Raman detection of a ligand vibration on ferric nitrosyl heme proteins."J. Am. Chem. Soc.. Vol. 123. 2666-2667 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Chu, G. C, Ikeda-Saito et al: "Axil ligation state of five-coordinate heme oxygemase proximal histidine mutants, as revealed by EPR and resonance Reaman spectroscopy."J. Am. Chem. Soc.. Vol. 122. 12612-12613 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lesnefsky, E. J., Ikeda-Saito M., et al: "Ischemic injury to mitochondrial erectron transport in the aging heart: Damage to the iron-sulfur protein subunit of electron transport complex III"Arch. Biocnem. Biophys.. Vol. 385. 117-128 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lesnefsky, E. J., Ikeda-Saito M., et al: "Aging decreases electron transport complex III activity in heart interfibrillar mitochondria by alteration of the cytochrome c binding site."J. MoL. Cell Gardiol.. Vol. 33. 37-47 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Tomita, T. Yoshimura: "Practical Protocols to Nitiric Oxide Researchers (tentative)"Kyoritsu Shuppan co., Ltd.. 288 (2000)

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

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Published: 2003-09-17  

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