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Production of selenomethionine labeled proteins by cell-free translation system and application to X-ray crystal structure analysis.

Research Project

Project/Area Number 13680692
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural biochemistry
Research InstitutionEhime University

Principal Investigator

HORI Hiroyuki  Ehime University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20256960)

Co-Investigator(Kenkyū-buntansha) SAWASAKI Tatsuya  Ehime University, Faculty of Engineering, Instructor, 工学部, 助手 (50314969)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsCell-free translation / MAD / selenomethionine / X-ray crystal structure analysis / RNA modification enzymes / 翻訳 / 多波長異常分散法 / セレノメチオニン
Research Abstract

We investigated the selenomethionine (SeMet) labeling of two model proteins (GFP and DHFR) by wheat germ in vitro cell-free translation system. The yields of the produced proteins were equal to those of the usual methionine (Met) proteins. We analyzed the contents of SeMet and Met in the proteins by LC/MS spectrometry. We analyzed the LC chromatograms thoroughly, however, we could not detect the Met labeled peptide fragment derived from the intrinsic Met. These results strongly suggest that the efficiency of foe labeling was near 100%. Further, we also found that SeMet residues in the model proteins were not oxidized during the store at -80℃ for 6 months.
Although the formation of the chromophore of SeMet-GFP was slow as compared to Met-GFP, the line shape of the fluorescence spectrum of the protein coincides with that of Met-GFP, suggesting that the SeMet labeling did not affect the environment around the chromophore. In the case of DHFR, Met residues are included the M20 loop, which plays a key role in the catalytic cycles. However, SeMet labeling did not change the enzymatic activity apparently.
We utilized this labeling technique to apply the X-ray crystal analysis of tRNA methyltransferase. Now, we are going on the structural refinement of the crystal at 1.5Å resolutions. Based on these experimental results, we confirmed that cell-free translation system was applicable to the structural proteomics.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] H.Hori, T.Suzuki, K.Sugawara, Y.Inoue, T.Shibata, S.Kuramitsu, S.Yokoyama, T.Oshima, K.Watanabe: "Identification and Characterization of tRNA-(Gm18)-methyltransferase from Thermus thermophilus HB8 ; Domain Structure and Conserved Amino Acid Sequence Motifs"Genes to Cells. 7. 259-272 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takeda, H.Hori, Y.Endo: "Identification of A quifex aeolicus tRNA (m^2_2G26) Methyltransferase Gene"Nucleic Acids Res. Supplement. 2. 229-230 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Hori, T. Suzuki, K. Sugawara, Y. Inoue, T. Shibata, S. Kuramitsu, S. Yokoyama, T. Oshima, and K. Watanabe: "Identification and Characterization of tRNA-(Gm18)-methyltransferase from Thermus therm ophilus HB8 ; Domain Structure and Conserved Amino Acid Sequence Motifs"Genes to Cells. 7. 259-272 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Takeda, H. Hori, and Y. Endo: "Identification of Aquifex aeolicus tRNA (m^2_2G26) Methyltransferase Gene"Nucleic Acids Res.. Supplement 2. 229-230 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Hori, T.Suzuki, K.Sugawara, Y.Inoue, T.Shibata, S.Kuramitsu, S.Yokoyama, T.Oshima, K.Watanabe: "Identification and Characterization of tRNA-(Gml8)-methyltransferase from Thermus thermophilus HB8; Domain Structure and Conserved Amino Acid Sequence Motifs"Genes to Cells. 7. 259-272 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Takeda, H.Hori, Y.Endo: "Identification of A quifex aeclicus tRNA (m^2_2G26) Methyltransferase Gene"Nucleic Acids Res. Supplement. 2. 229-230 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] N.J.Cosper, R.A.Scott, H.Hori, T.Nishino, T.Iwasaki: "X-Ray Absorption Spectroscopic Analysis of the High-Spin Ferriheme Site in Substrate-Bound Neuronal Nitric-Oxide Synthase"J. Biochem.. 130. 191-198 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Watanabe, H.Hori, Y.Endo: "Identification of Essential Amino Acid Residues of tRNA (Gm18) Methyltransferase for Methyl-Transfer Activity"Nucleic Acids Res. Supplement. 1. 33-34 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.-M.Park, T.Higuchi, K.Kikuchi, Y.Urano, H.Hori, T.Nishino, J.Aoki, K.Inoue, T.Nagano: "Selective Inhibition of Human Inducible Nitric Oxide Synthase by S-Alkyl-L-Isothiocitrulline-Containing Dipeptide"British J. Pharmachol.. 132. 1876-1882 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kazunori Watanabe, Hiroyuki Hori, Yaeta Endo: "Identification of essential amlnoacid residues of tRNA (Gm18) methyl-transferase for methyl-transfer activity"Nucleic Acids Research Supplement. 1. 33-34 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Hiroyuki Hori, et al.: "Identification and characterization of tRNA (Gm18) methlytransferase from Thermus thermophilus HB 8 : domain structure and conserved amluo acid sequence notifs."Genes To Cells. 7(9名中第1著者)(印刷中). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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