Role of the Endocytic Machinery in the Sorting of Lysosome-associated Membrane Proteins

• Katy Janvier

  Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892

• Juan S. Bonifacino

  Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892

抄録

The limiting membrane of the lysosome contains a group of transmembrane glycoproteins named lysosome-associated membrane proteins (Lamps). These proteins are targeted to lysosomes by virtue of tyrosine-based sorting signals in their cytosolic tails. Four adaptor protein (AP) complexes, AP-1, AP-2, AP-3, and AP-4, interact with such signals and are therefore candidates for mediating sorting of the Lamps to lysosomes. However, the role of these complexes and of the coat protein, clathrin, in sorting of the Lamps in vivo has either not been addressed or remains controversial. We have used RNA interference to show that AP-2 and clathrin—and to a lesser extent the other AP complexes—are required for efficient delivery of the Lamps to lysosomes. Because AP-2 is exclusively associated with plasma membrane clathrin coats, our observations imply that a significant population of Lamps traffic via the plasma membrane en route to lysosomes.

収録刊行物

• Molecular Biology of the Cell

  Molecular Biology of the Cell 16 (9), 4231-4242, 2005-09

  American Society for Cell Biology (ASCB)

キーワード

• Cell Biology
• Molecular Biology

詳細情報

• CRID: 1363107370860872320
• NII論文ID: 30018380130
• DOI: 10.1091/mbc.e05-03-0213
• ISSN: 19394586
• ISSN: 10591524
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