| Project/Area Number |
15201025
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanomaterials/Nanobioscience
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OKAHATA Yoshio Tokyo Institute of Technology, Frontier Collaborative Research Center, Professor, フロンティア創造共同研究センター, 教授 (80038017)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Toshiaki Tokyo Institute of Technology, Department of Biomolecular Engineering, Associate Professor, 大学院・生命理工学研究科, 助教授 (50262308)
FURUSAWA Hiroyuki Tokyo Institute of Technology, Department of Biomolecular Engineering, Research Associate, 大学院・生命理工学研究科, 助手 (60345395)
KAWASAKI Takatoshi Tokyo Institute of Technology, Department of Biomolecular Engineering, Research Associate, 大学院・生命理工学研究科, 助手 (60334504)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥50,570,000 (Direct Cost: ¥38,900,000、Indirect Cost: ¥11,670,000)
Fiscal Year 2005: ¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
Fiscal Year 2004: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2003: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000)
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| Keywords | Quartz crystal microbalance / Network analyzer / Energy dissipation factor / Conformation of Proteins / p53 Protein / タンパク質のコンフォメーション変化 / 表面プラズモン共鳴 / インピーダンスアナライザー / 分子認識 |
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| Research Abstract |
By using a 27-MHz piezoelectric quartz oscillator connected with a vector network analyzer, we obtained resonance frequency decreases (-ΔF_<water>) and energy dissipation increases (ΔD_<water>) during binding of biotinylated BSA (bovine serum albumin), biotinylated ssDNA, biotinylated dsDNA, and biotinylated pullulan to a NeutrAvidin-immobilized 27-MHz QCM (quartz crystal microbalance) plate in aqueous solution, as well as in the wet air phase (97% humidity, -ΔF_<wet> and ΔD_<wet>) and in the dry air phase (-ΔF_<air> and ΔD_<air>). The -ΔF_<air> value indicates real mass changes due to the binding of these biomolecules. Values for polystyrene were also obtained as elastic and hydrophobic membranes. In terms of results, (-ΔF_<wet>)/(-ΔF_<air>) values indicated the binding water ratio per unit biomolecular mass were in the order of pullulan (2.1- 2.2) > DNAs = proteins (1.4- 1.6) > polystyrene (1.0). The (-ΔF_<water>)/(-ΔF_<air>) values indicated the hydrodynamic water (binding and vibrating water) ratio per unit biomolecular mass were in the order of dsDNA (6.5)> ssDNA = pullulan (3.5- 4.4) > proteins (2.4- 2.5) > polystyrene (1.0). The aforementioned values suggest that the energy dissipation of proteins was mainly caused by hydration and that proteins themselves are elastic molecules without energy dissipation in aqueous solutions. On the contrary, plots in cases of DNAs and pullulans were relatively deviant toward the large hydration and energy dissipation from the linearity observed with proteins, meaning that the large energy dissipation occurs because of viscoelastic properties of linear DNAs and pullulans in the water phase, in addition to energy dissipation due to the hydration of molecules.
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