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Analysis of dynamic behavior of mutant hen lysozyme with larger catalytic constant using high resolution NMR

Research Project

Project/Area Number 07680725
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Biophysics
Research InstitutionKyushu University

Principal Investigator

UEDA Tadashi  Kyushu Univ., Grad.Sch.Pharm.Sci., Assoc.Prof., 大学院・薬学研究科, 助教授 (90184928)

Co-Investigator(Kenkyū-buntansha) KAWANO Keiichi  Hokkaido Univ., Grad.Sch.Pharm.Sci., Assoc.Prof., 大学院・理学研究科, 助教授 (10136492)
IMOTO Taiji  Kyushu Univ., Grad.Sch.Pharm.Sci., Prof., 大学院・薬学研究科, 教授 (90038282)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordslysozyme / NMR / order parameter / fluctuation / ^<15>N labeling / activity / NMR(核磁気共鳴法) / 安定同位体ラベル化 / Pichia / 核磁気共鳴法(NMR) / 大腸菌 / ゆらぎ
Research Abstract

Recently, we have shown that mutant hen lysozyme where Arg14 and His15 are simultaneously deleted has a higher activity against glycol chitin than that of wild lysozyme while mutated region is far from the active site cleft. From analysis of H-D exchange rate constants in Trp residues of the wild and the mutant lysozyme using NMR,the exchange rate constants in Trp63 of mutant lysozyme, which is located far from the mutated site, was larger than that of wild lysozyme. These results indicated that the increased activity depended on the increased fluctuation (Imoto et al., 1994, Protein Engng.).
Therefore, in this research, in order elucidate whether the increased activity was resulted from the local fluctuation in the active site cleft or the global one of whole molecule, we prepared ^<15>N uniformly labeled wild and mutant lysozymes from Pichia pastoris and measured the relaxation time (T_1 and T_2) of nitrogen atoms and NOEs between ^1H and ^<15>N in them in the presence or absence of substrate analogue. Order parameters in every residues of ^<15>N uniformly labeled wild and mutant lysozymes were calculated by model free analysis of the relaxation time (T_1 and T_2) of nitrogen atoms and NOEs between ^1H and ^<15>N.As the results, it was elucidated that almost all of the order parameters in the mutant lysozyme were smaller than those of wild lysozyme, resulting in that the increased activity was resulted from the global fluctuation of whole molecule.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Sohei Mine: "Improvement of the refolding yield and solubility of her egg-white lysozyme by altering Met residue attached to its N-terminal to ser." Protein Engineering. 10(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Mine et al: "Improvement of the refolding yield and solubility of hen egg-while lysozyme by altering Met residue attached to its N-terminal to Ser." Protein Engineering. 10 (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroyuki Motoshima: "Analysis of the transition state in the unfolding of hen lysozyme by introduction of Gly-Pro and Pro-Gly sequence at the same site" The Journal of Biochemistry. 119・6. 1019-1023 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Takanori So: "Situation of monomethoxypolyethylene glycol coralently attached to lysozyme" The Journal of Biochemistry. 119・6. 1086-1093 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yoshito Abe: "Effect of Salt Concentration on the pKa of Acidic Residues in Lysozyme" The Journal of Biochemistry. 118. 946-952 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Tadashi Ueda: "Kinetically Trapped Structure in the Renaturation of Reduced Oxindolealanine 62 Lysozyme" Biochemistry. 34. 16178-16185 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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