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2003 Fiscal Year Final Research Report Summary

First-principles theory of the protein nanotubes

Research Project

Project/Area Number 13440127
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionWaseda University

Principal Investigator

TAKEDA Kyozaburo  Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (40277851)

Co-Investigator(Kenkyū-buntansha) SHIRAISHI Kenji  University of Tsukuba, Physics, associate professor, 物理学系, 助教授 (20334039)
MIHARA Hisakazu  Tokyo Institute of Technology, Bioscience & Biotechnology, associate professor, 生命理工学部, 助教授 (30183966)
Project Period (FY) 2001 – 2003
KeywordsProtein nanotube / Protein nanoring / Mathematical molecular desigining / Ab initio molecular orbitals theory / D.L alternating amino acids rings / Synthesis and AFM observation / Electronic structure / Molecular structure
Research Abstract

The peptide nanotube (PNT) is formed by the spontaneous stacking of cyclic peptides (or peptide nanorings ; PNRs) consisting of an alternate sequence of D-and L-amino acid residues (D,L-peptide). Because of its peculiar periodic structure with an open-ended hollow core, PNT has attracted the interest of many scientists. An aim of the present project is to provide the guiding principle of molecular modeling in PNRs and peptide PNTs. For this purpose, possible molecular conformations of PNRs and PNTs were mathematically investigated and novel types of backbone structures were explored by the numerical conformation analysis. The energetically stable backbone forms of the PNRs and PNTs were also studied, and the electronic structures were discussed based on ab initio molecular orbital calculations. The effects of the amino acid substitution were studied and the electronic characteristics of the individual side chains were systematically understood. Not only the theoretical studies, but also the synthesis and atomic force microscopy were carried out for the D,L-peptide nanotubes. PNTs having six, and eight amino acid residues were synthesized and their self-assembling morphologies were compared in terms of the difference in the number of component amino acid residues. In addition to the D,L-peptide nanotubes, an unusual peptide nanotube consisting of all the L-amino acid residues was newly synthesized. Following the theoretical prediction and synthesis, an atomic force microscopy study of the homo-L-pentapeptide nanotube was carried out and the self-assembling morphology was discussed.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Okamoto, Takeda, Mihara et al.: "A Study of the Self-Assembling Morphology in Peptide Nanorings and Nanotubes"Mat.Res.Soc.Symp.Proc. EXS-1. H391 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakanishi, Takeda et al.: "Polymorphy in the stereo-structure of periodic polymer backbones"J.Poly.Sci.B. 41. 2829-2849 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okamoto, Takeda et al.: "Variety of the Molecular Conformation in Peptide Nano-Rings and Nano-Tubes"J.Am.Chem.Soc. 125. 2756-2769 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okamoto, Takeda, Mihara et al.: "Theoretical Prediction and AFM Observations of the Protein Nanotube"Jpn.J.Appl.Phys. 42. 676-679 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakanishi, Takeda, Mihara et al.: "Synthesis and"Phys.Rev.B. 66. 165417-1-165417-8 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okamoto, Takeda, Shiraishi: "First-principles study of the electronic and molecular structure"Phys.Rev.B. 64. 115425-115441 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岡本創, 武田京三郎: "カーボンナノチューブ -期待される材料開発-"シームーシ出版. 105 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okamoto, Takeda, et al.: "Variety of the Molecular Conformation in Peptide Nano-Rings and Nano-Tubes"J. Am. Chem. Soc.. 125. 2756 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okamoto, Takeda, Mihara et al.: "Theoretical Prediction and AFM Observations of the Protein Nanotube, Consisting of Homo-{\scriptsize L-}$\alpha$-Amino Acid Penta-Peptide Nanorings"Jpn. J. Appl. Phys.. 42. 676-679 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakanishi, Takeda, Mihara et al.: "Synthesis and Atomic Force Microscopy Observations of the Single Peptide Nanotubes and their Micro-order Assemblies"Phys. Rev. B. 66. 165417 (2002)

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

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Published: 2005-04-19  

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