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- Jennifer Hirst
- University of Cambridge, Department of Clinical Biochemistry, Cambridge Institute for Medical Research, Cambridge CB2 2XY, United Kingdom; and
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- Alison Motley
- University of Cambridge, Department of Clinical Biochemistry, Cambridge Institute for Medical Research, Cambridge CB2 2XY, United Kingdom; and
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- Kouki Harasaki
- University of Cambridge, Department of Clinical Biochemistry, Cambridge Institute for Medical Research, Cambridge CB2 2XY, United Kingdom; and
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- Sew Y. Peak Chew
- MRC Laboratory of Molecular Biology, Cambridge CB2 2QH, United Kingdom
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- Margaret S. Robinson
- University of Cambridge, Department of Clinical Biochemistry, Cambridge Institute for Medical Research, Cambridge CB2 2XY, United Kingdom; and
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- Suzanne R. Pfeffer
- editor
抄録
<jats:p>We have used GST pulldowns from A431 cell cytosol to identify three new binding partners for the γ-adaptin appendage: Snx9, ARF GAP1, and a novel ENTH domain-containing protein, epsinR. EpsinR is a highly conserved protein that colocalizes with AP-1 and is enriched in purified clathrin-coated vesicles. However, it does not require AP-1 to get onto membranes and remains membrane-associated in AP-1–deficient cells. Moreover, although epsinR binds AP-1 via its COOH-terminal domain, its NH<jats:sub>2</jats:sub>-terminal ENTH domain can be independently recruited onto membranes, both in vivo and in vitro. Brefeldin A causes epsinR to redistribute into the cytosol, and recruitment of the ENTH domain requires GTPγS, indicating that membrane association is ARF dependent. In protein-lipid overlay assays, the epsinR ENTH domain binds to PtdIns(4)P, suggesting a possible mechanism for ARF-dependent recruitment onto TGN membranes. When epsinR is depleted from cells by RNAi, cathepsin D is still correctly processed intracellularly to the mature form. This indicates that although epsinR is likely to be an important component of the AP-1 network, it is not necessary for the sorting of lysosomal enzymes.</jats:p>
収録刊行物
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- Molecular Biology of the Cell
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Molecular Biology of the Cell 14 (2), 625-641, 2003-02
American Society for Cell Biology (ASCB)
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詳細情報 詳細情報について
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- CRID
- 1362825894890615936
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- NII論文ID
- 30018378464
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- ISSN
- 19394586
- 10591524
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- データソース種別
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