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STRUCTURE AND FUNCTION OF PEPTIDE SIGNALS FOR INTRACELLULAR LOGALIZATION OF AQP2 VASOPRESSIN WATER CHANNEL

Research Project

Project/Area Number 09671154
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Kidney internal medicine
Research InstitutionTokyo Medical and Dental University School of Medicine

Principal Investigator

TOUJOU Naoko (1998)  TOKYO MEDICAL AND DENTAL UNIVERSITY SCHOOL OF MEDICINE,DEPARTMENT OF LABORATORY MEDICINE,ASSISTANT PROFESSOR, 医学部, 助手 (90227554)

伏見 清秀 (1997)  東京医科歯科大学, 医学部, 助手 (50270913)

Co-Investigator(Kenkyū-buntansha) SASAKI Sei  TOKYO MEDICAL AND DENTAL UNIVERSITY SCHOOL OF MEDICINE,SECOND DEPARTMENT OF INTE, 医学部, 助教授 (60170677)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsWATER CHANNEL / CELL POLARITY / VASOPRESSIN / KIDNEY COLLECTING DUCT / AQUAPORIN / 集合尿細管 / 尿濃縮機構
Research Abstract

The purposes of this research were to identify molecular structure and regulatory mechanisms of vasopressin water charnel AQP2 In kidney collecting duct, and to detennine peptide signals for intracellular localization of NQP2.
First, we examined mo1ecular structure of AQP2, which was first cloned by the head investigator, using molecular techniques of site-directed mutagenes is and gene expression. We were able to localize the aqueous pore in the AQP2 molecule and proposed a three-dimensional structure model of AOP2. In our model aqueous pore of AQP2 is composed of two of five hydrophilic loops of AQP2, which is a membrane protein with six transmenbrane segments connected by five hydrophilic loops.
Second. we found that intracellular trafficking of AQP2 is involved in the vasopressin regulation of osmotic water permeability of kidney collecting duct apical membrane. It was observed that, after vasopressin stimulation, AQP2 stored on endosomal membrane was transferred to the surface mentrane with exocytosis of vesicles from cytoplasm to the apical membrane, resulting in the increase of osmotic water permeability of the apical mentrane. In these regulatory steps, we proved that phosphorylation of serine 256 by protein kinase A is required for cAMP-dependent regulatory exocytosis of AQP2.
Third, we examined function and intracellular localization of four AQP2 mutants. T125M, A147T, R187C.S216P, that cause nephrogenic diabetes insipidus. It was found that A147T mutation alters water permeability but dose not alter intracellular channel localization but other mutants alter channel localization. We speculate that molecular structure near A147T is critical for channel function but not significant for intracellular trafficking.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Fushimi.K,Bai.L,Marumo.F.Sasaki.S.: "Isolation of a gene endocing nadulin-like intrinsic protein of Esherichia coli." Biochemistry Molecular Biology International. 41. 995-1003 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Fushimi.K,Sasaki.S,Marumo.F: "Phosphorylation of serine 256 is required for cAMP-dependent requlatory exocytosis of the aquaporin-2 water channel." Journal of Biological Chemistry. 272. 14800-14804 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamaguchi.K,Fushimi.K,Yamashita.Y,Shinbo.I,Sasaki.S,Marumo.F: "Effects of missense mutations on the function and intracellular localization of rat aquaporin-2 in LLC-PK1 porchine kidney cells." Kidney International. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kiyohide Fushimi: "Aquaporin-2 rasopressin water channel.In Membrane proteins -Structure,function and expression control.Naotaka Hamasaki,Katsuyoshi Mihara eds." Kyushu University Press,Fukuoka,Japan and S.Karger AG,Barsel Switzerland, (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kiyohide Fushimi, Liqun Bai, Fumiaki Marumo, Sei Sasaki.: "Isolation of a gene encoding nodulin-like intrinsic protein of Esherichia coli." Biochemistry and Molecular Biology International. 41 (5). 995-1003 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kiyohide Fushimi, Sei Sasaki, Fumiaki Marumo.: "Phosphorylation of serine 256 is required for cAMP-dependent regulatory exocytosis of aquaporin-2 water channel." Journal of Boilogical chemistry. 272 (23). 14800-14804 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yamauchi, K,Fushimi, K,Yamashita, Y,Shinbo, I,Sasaki, S,Marumo F.: "Effects of missense mutations on the function and intracellular localization of rat aquaporin-2 in LLC-PK1 porcine kidney cells." Kidney International. (IN PRINT). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kiyohide Fushimi: Aquaporin-2 vasopressin water channel. In Membrane proteins-Structure, function and expression control. Naotaka Hamasaki, Katsuyoshi Mihara eds.Kyushu University Press, Fukuoka, Japan and S.Karger AG,Barsel, Switzerland, (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Fushimi,K. Bai,L,Harumo.F,Sasaki,S.: "Isolation of a gene endocing nodulin-like intrinsic protein of Esherichia coli." Biochemistry Molecular Biology Intarnational. 41. 995-1003 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Fushimi.K,Sasaki.S,Harumo.F.: "Phosphorylation of serine 256 is required for c AMP-dependent regulatory exocytosis of the aquaporin-2 water channel." Journal of Biological Chemistry. 272. 14800-14804 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yamauchi.K,Fushimi.K,Yamashita.Y,Shinba.I,Sasaki.S,Marumo.F.: "Effects of missense mutations on the function and intracellular localization of rat aquaporin-2 in LLC-PK1 Porchine kidney cells." kidney International. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kiyohide Fushimi.: "Aquaporin-2 rasopression water channel. In Mem brane proteins-Structure,function and expression cautrol-Naotaka Hamasaki,Katsuyoshi Mihara eds." Kyusyu University Press,Fukuoka,Japan and S.Karger AG,Barsel,switzerland, (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Fushimi,K, et al.: "Isolation of a gene encoding nodulin-like intrinsic protein of E,coli" Biochem Mol Biol Intern.41・5. 995-1003 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Fushimi,K., et al.: "Phosphorylation of serine 256 is roquired for cAMP-dependent regulating exocytosis of the aquaporin-2 water channel" J,Biol,Chem.272.23. 14800-14804 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Saito,T,, et al: "Alteration in water channel AQP2 by removal of AVP stimvlation in collecting duct cells of dehydrated rat" Amer.J.Physiol.Renal Physiol. 41・2. F198-F191 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yamamoto, T., et al: "Expression of AQP family in rat kidneys during development and muturation" Amer.J.Physiol Renal Physiol.41・2. F198-F204 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ishibashi,K., et al.: "Immvnolocalization and effect of dehydration on AQP3,a basolateval water channel of kidny collecting ducts" Amer.J.Physid.Rend Physid.41・2. F235-F241 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Sasaki,S., et al.: "Aquaporin and ion conductauce" Science. 275・5305. 1490-1491 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Fushimi,K.: "Membrane Proteins:Stracture,Function and Expression contral" Karger,Basel,Suitzerland, 413 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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