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Elucidation of structure-function relationships of soybean glycinin by protein engineering

Research Project

Project/Area Number 04660144
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 製造化学・食品
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

UTSUMI Shigeru  Kyoto University, Res.Inst.Food Sci., Assoc.Prof., 食糧科学研究所, 助教授 (40111976)

Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsSoybean proteins / Glycinin / Protein engineering / Structure-function relationships / Gelation / Emusification / X-ray crystallography / 結晶化 / X線解析 / 構造構築
Research Abstract

Glycinin is one of the dominant storage proteins of soybean seeds. The relationships between the structure and the food functional properties of glycinin were investigated at the molecular level by means of protein engineering. Glycinin was modified on the basis of its structural characteristics and the relationships between the structure and the functional properties elucidated at the subunit level. The functional properties of the modified proglycinins expressed in E.coli were measured. The results suggest that the hydrophobicity of the C-terminal region is closely related to emulsification, that the disulfide bond 12-45 plays an important role in the initiation of the disulfide exchange reaction required for gelation, that the number and the topology of free sulfhydryl residues are closely related to gelation, and that the factors of the structural instability desired for gelation and emulsification are different each other.
Crystals of the normal and modified proglycinins (DELTAI, DELTAV8, IV+4Met, V+4Met, Gly12, Ser88) expressed in E.coli have been grown. The crystals of normal, DELTAI, V+4Met Gly12 and Ser88 diffracted X-rays sufficiently for crystallographic analysis. Normal, DELTAI, Clyl2 and Ser88 crystals belong to the tetragonal system, space group P4_1 or P4_3 with unit cell dimensions a=b=114.3-115.9 A and c=145.1-147.1 A.V+ 4Met crystals are monoclinic, belonging to space group P2 with unit cell parameters a=118.7 A, b=78.1 A, c=109.9 A and beta=119゚. The number of protomers/asymmetric unit of these crystals is calculated to be around 3. This value is consistent with the fact that proglycinins are trimers. These data indicate that these crystals examined here are suitable for X-ray crystallography to elucidate the relationships between the structure and the functional properties of glycinin at molecular level.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Shigeru Utsumi: "Effect of deletion of disulfide bonds by protein engineering on the conformation and functional properties of soybean proglycinin" J.Agric.Food Chem.41. 687-691 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeru Utsumi: "Crystallization and preliminary X-ray crystallographic analysis of the soybean proglycinin expressed in Escherichiacoli" J.Mol.Biol.233. 177-178 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeru Utsumi: "Synthesis,processing and accumulation of modified glycinins of soybean in the seeds,leaves and stems of transgenic tobacco" Plant Science. 92. 191-202 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Andrew B.Gidamis: "Crystallization and preliminary X-ray analysis of soybean proglycinins modified by protein engineering(in press)" Biosci.Biotech.Biochem.58. (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeru Utsumi, Andrew B.Gidamis, Jiro Kanamori, II Jun Kang and Makoto Kito: "Effects of deletion of disulfide bonds by protein engineering on the conformation and functional properties of soybean proglycinin." J.Agric.Food Chem.41. 687-691 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeru Utsumi, Andrew B.Gidamis, Bunzo Mikami and Makoto Kito: "Crystallization and preliminary X-ray crystallographic analysis of the soybean proglycinin expressed in Escherichia coli." J.Mol.Biol.233. 177-178 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Andrew B.Gidamis, Bunzo Mikami, Tomoyuki Katsube, Shigeru Utsumi and Makoto Kito: "Crystallization and preliminary X-ray analysis of soybean proglycinins modified by protein engineering" Biosci.Biotech.Biochem.58, (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigeru Utsumi: "Crystallization and preliminary X-ray crystallographic analysis of the soybean proglycinin expressed in Escherichia coli" J.Mol.Biol.233. 117-178 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Andrew B.Gidamis: "Crystallization and preliminary X-ray analysis of soybean proglycinins modified by protein engineering" Biosci.Biotech.Biochem.58(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Shigeru Utsumi: "Plant food protein engineering" Advances in Food and Nutrition Research. 36. 89-208 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Shigeru Utsumi: "Effect of deletion of disulfide bonds by portein engineering on the conformation and functional properties of soybean proglycinin" J.Agric.Food Chem.41. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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