| Project/Area Number |
14580662
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional biochemistry
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| Research Institution | Aichi Cancer Center Research Institute |
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Principal Investigator |
IZAWA Ichiro Aichi Cancer Ctr., Div.of Biochemistry, Senior Researcher, 発がん制御研究部, 主任研究員 (20311441)
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| Co-Investigator(Kenkyū-buntansha) |
INAGAKI Masaki Aichi Cancer Ctr., Div.of Biochemistry, Chief, 発がん制御研究部, 部長 (30183007)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2002: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Intermediate-filament / desmosome / adherens junction / ERBIN / Densin-180 / デスモリーム |
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| Research Abstract |
1.Keratin filament is one of intermediate filaments (IFs), which are major components of the cytoskeleton. By use of the yeast two-hybrid technique, we identified a new protein, Trichoplein, as a keratin 8-binding protein. Trichoplein shows homology to trichohyalin and plectin. Antibodies raised against Trichoplein specifically recognized a polypeptide with a relative molecular mass of 61 kDa in cell lysates. Trichoplein was co-immunoprecipitated with keratin 8/18, and co-localized with keratin 8/18 in cells.
2.To elucidate the functions of mammalian LAP [leucine-rich repeats and PSD-95/dlg-A/ZO-1 (PDZ) domains] proteins, we screened yeast two-hybrid libraries, using ERBIN co-localized with p0071 at adherens junctions and desmosomes of Madin-Darby canine kidney (MDCK) cells. The subcellular localization of ERBIN could be regulated by Rho family small GTPases. We identified delta-catenin/neural plakophilin-related armadillo-repeat protein (NPRAP) as a binding protein for Densin-180, and showed that Densin-180 is associated with delta-catenin/NPRAP and N-cadherin at synapses. We also isolated MAGUIN-1 as a Densin-180-binding protein, and suggested that the potential to dimerize or multimerize allows MAGUIN-1 to bind simultaneously to both Densin-180 and PSD-95, leading to the ternary complex assembly of these proteins at the postsynaptic membrane. These observations will pave the way toward further research on cell polarity and cell adhesions as well as understanding of pathological mechanisms of cancer.
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