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大腸菌蛋白質分泌の分子機構

Research Project

Project/Area Number 04259102
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionTokyo University of Pharmacy and Life Science (1993)
The University of Tokyo (1992)

Principal Investigator

水島 昭二  東京薬科大学, 生命科学部, 教授 (50013313)

Co-Investigator(Kenkyū-buntansha) 伊藤 維昭  京都大学, ウィルス研究所, 教授 (90027334)
徳田 元  東京大学, 分子細胞生物学研究所, 助教授 (40125943)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥49,300,000 (Direct Cost: ¥49,300,000)
Fiscal Year 1993: ¥24,000,000 (Direct Cost: ¥24,000,000)
Fiscal Year 1992: ¥25,300,000 (Direct Cost: ¥25,300,000)
Keywords蛋白質の分泌 / 蛋白質の膜透過 / Sec蛋白質 / SecY / SecA / SecG / Ydr / FtsH / SecE / シグナルペプチド / 変異解析
Research Abstract

1.水島グループの研究成果:(1)膜透過反応の初期過程で中心的役割を果すSecAと前駆体蛋白質の相互作用を著しく促進する蛋白質を発見し、蛋白質、遺伝子両レベルで詳細な解析を行った。(2)前駆体蛋白質がシグナルペプチドの疎水領域を外側に突出するような形でSecA分子と相互作用すること、またこの相互作用によってSecF自身も疎水領域を外部に露出させることをNMR解析によって示した。(3)SecAがSecD、SecYの膜内アッセンブリーに関与することを示した。(4)以上の成果を組み込んだ分泌型蛋白質の膜透過モデルを提示した。
2.徳田グループの研究成果:大腸菌の蛋白質膜透過系は、SecA、SecY、SecEを中心として構成されており、これら3種の因子のみを再構成したプロテオリポゾームの活性を顕著に促進させる新因子p12を細胞質膜中に見いだし、これを均一に精製した。p12の部分アミノ酸配列を基に構造遺伝子を同定しその全塩基配列を決定した。p12遺伝子の破壊株を構築し、細胞での蛋白質分泌が阻害されていることを示した。以上の結果から、p12が大腸菌蛋白質膜透過系を構成する新因子であることを明らかにし、SecGと命名した。
3.伊藤グループの研究成果:SecY‐SecE複合形成にはSecYの細胞質ドメイン4を介した細胞質領域どうしの相互作用が重要であること、SecY‐SecEの結合は合成後直ちに起こり、一旦形成されたSecY‐SecE複合体は細胞内で安定に保持され、Biekerらの解離会合モデルは考え難いことを示した。In vitroでSecY複合体形成や種々の変異体の活性変化を調べる系の構築を進めた。Ydr遺伝子産物には野性型SecY分子の選択的安定化および、SecY‐SecE相互作用への阻害的介入の機能があることを示した。FtsH機能とチャペロン機能のオーバーラップおよびFtsHの単独SecYの分解への関与を見出した。

Report

(2 results)
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] S.Matsuyama et al.: "SecD is involved in the release of translocated secretory proteins from the cytoplasmic membrane of Escherichia coli." EMBO J.12. 265-270 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Ichihara et al.: "Molecular cloning,sequencing,and mapping of the gene encoding protease I and characterization of proteinase and proteinase‐defective Escherichia coli mutants." J.Bacteriol.175. 1032-1037 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Kato et al.: "Translocation of conjugated presecretory proteins possessing an intemal non‐peptide domain into everted membrane vesicles in Escherichia coli." J.Biol.268. 3586-3593 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] D.Fourel et al.: "Specific regions of Escherichia coli OmpF protein involved in antigenic/colicin receptor sites and in stable trimerization." J.Bacteriol.175. 2754-2757 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Kawasaki et al.: "Membrane vesicles containing overproduced SecY and SecE exhibit high translocation ATPase activity and countermovement of proteins in a SecA‐and presecretory protein‐dependent manner." J.Biol.Chem.268. 8193-8198 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] D.A.Phoenix et al.: "OmpF‐Lpp signal sequence mutants with varying charge hydrophobicity ratios provide evidence for a phosphatidylglycerol‐signal sequence interaction during protein translocation across the Escherichia coli inner membrane." J.Biol.Chem.268. 17069-17073 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] D.A.Phoenix et al.: "Phosphatidylglycerol dependent protein translocation across the Escherichia coli inner membrane is inhibited by the anticancer drug doxorubicin." FEBS Letters. 324. 113-116 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Nishiyama et al.: "A novel membrane protein involved in protein translocation across the cytoplasmic membrane of Escherichia coli." EMBO.J.12. 3409-3415 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Hong-mei Lu et al.: "A periplasmic intermediate in the extracellular secretion pathway of Pseudomonas aeruginosa exotoxin A." J.Bacteriol.175. 7463-7467 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Tokuda et al.: "Histidine residucs are invloved in translocation‐coupled ATP hydrolysis by the SecA" Biochem.Biophys.Res.Commun.192. 1415-1421 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 徳田元: "大腸菌蛋白質分泌の分子機構" 蛋白質、核酸、酸素. 38. 947-956 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Akiyama.et al.: "Folding and assembly of bacterial alkaline phosphatase in vitro and in vivo." J.Biol.Chem.268. 8146-8150 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Taura et al.: "Determinants of quantity of the stable SecY complex in the Escherichia coli cell." J.Bacteriol.175. 7771-7775 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] C.Herman et al.: "Cell growth and lambda phage development controlled by the same essential Escherichia coli gene,ftsH/hflB." Proc.NatI.Acad.Sci.USA. 90. 10861-10865 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Akiyama et al.: "Involvement of FtsH in protein assembly into and throuhgh the membrane.I.Mutations that reduce retention efficiency of a cytoplasmic reporter." J.Biol.Chem.269(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Akiyama et al.: "Involvement of FtsH in protein assembly into and through the membrane.II.Dominant mutations affecting FtsH functions." J.Biol.Chem.269(in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Tauyra et al. 20GB17:Genetic analysis of SecY:additional export defective mutations and factors affecting their phenotypes.: Mol.Gen.Genet.,. (in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 徳田元: ""Annual Review細胞生物学1993(矢原、御子柴、月田編)"中外医学社" 大腸菌における分泌型蛋白質の細胞質膜透過系, 37-48 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 徳田元: ""最新生体膜システム(水島、宇井編)"講談社" タンパク質の細胞内輸送, 61-69 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Kato et al.: "In Vitro translocation of secretory proteins possessing no charges at the mature domain takes place efficiently in a protonmotive force-dependent manner." J.Biol.Chem.267. 413-418 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] L.Bruncage et al.: "SecY,SecE and band 1 form the membrane-embedded domain of E.coli preprotrin translocase." J.Biol Chem.267. 4166-4170 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] C.Hikita et al.: "Effects of total-hydrophobicity and length of the hydrophobic domain of a signal peptied on in vitro translocation effciency." J.Biol Chem.267. 4882-4888 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Nishiyama et al.: "The C-terminal region of SecE interacts with SecY and id functional in the reconstitution of protein translocation activity in Escherichia coli." J.Biol Chem.267. 7170-7176 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Matsuyama et al.: "Overproduction,purification and characterization of SecD and SecF,integral membrane components of the protein translocation machinery of Escherichia coli." Biochim.Biophys.Acta. 1122. 77-84 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] C.Hikita et al.: "The requirement of a positive charge at the amino terminus can be compensated for by a longer central hydrophobic stretch in the functioning of signala peptides." J.Biol.Chem.267. 12375-12379 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Takamatsu et al.: "In vivo and in vitro characterization of the SecA gene product of bacillus subtilis." J.Bacteriol.174. 4308-4316 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S,Matsuyama et al.: "Large-scale Production of membrane proteins fused to a truncated SecA in Escherichia coli." Biosci.Biotech.Biochem.56. 1512-1514 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Kamitani te al.: "Identification and characterization of an Escherichia coli gene required for the formation of correctly folded alkaline phosphatase,a periplasmic enzyme." BMBO J.11. 57-62 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] C.Ueguchi et al.: "Multicopy suppression:an approach to understanding intracellular functioning of the protein export system." J.Bacteriol.174. 1454-1461 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Shimoike et al.: "SecY variants that interfere with Escherichia coll protein export in the presence of normal secY." Mol.Microbiol.6. 1205-1210 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K,Ito et al.: "SecY and integral membrane components of the Escherichia colf protein translocation ststem." Mol.Microbiol.6. 2423-2428 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Taura et al.: "Insertional disruption of the nusB gene leads to cold-sensitive growth and suppression of the secY24 mutation." Mol.Gen.Genet.234. 429-432 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Akiyama et al.: "In vitro catalysis of oxidative folding of disulfide-bonded proteins by Escherichia coli dsdA (ppfA) gene product." J.Biol.Chem.267. 22440-22445 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Mizobata te al.: "Effects of the chaperonin GroE on the refolding of tryptophanase from Escherichia coli.Refolding is enhanced in the presence of ADP." J.Biol.chem.267. 17773-17779 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Akiyama et al.: "Folding and assembly of bacterial alkaline phosphatase in vitro and in vivo." J.Biol.Chem.268.

    • Related Report
      1992 Annual Research Report

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

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