Stonin 2: An Adaptor-like Protein That Interacts with Components of the Endocytic Machinery

Endocytosis of cell surface proteins is mediated by a complex molecular machinery that assembles on the inner surface of the plasma membrane. Here, we report the identification of two ubiquitously expressed human proteins, stonin 1 and stonin 2, related to components of the endocytic machinery. The...

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Veröffentlicht in:The Journal of cell biology 2001-05, Vol.153 (5), p.1111-1120
Hauptverfasser: Martina, José A., Bonangelino, Cecilia J., Aguilar, Rubén C., Bonifacino, Juan S.
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container_issue 5
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container_title The Journal of cell biology
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creator Martina, José A.
Bonangelino, Cecilia J.
Aguilar, Rubén C.
Bonifacino, Juan S.
description Endocytosis of cell surface proteins is mediated by a complex molecular machinery that assembles on the inner surface of the plasma membrane. Here, we report the identification of two ubiquitously expressed human proteins, stonin 1 and stonin 2, related to components of the endocytic machinery. The human stonins are homologous to the Drosophila melanogaster stoned B protein and exhibit a modular structure consisting of an NH2-terminal proline-rich domain, a central region of homology specific to the stonins, and a COOH-terminal region homologous to the μ subunits of adaptor protein (AP) complexes. Stonin 2, but not stonin 1, interacts with the endocytic machinery proteins Eps15, Eps15R, and intersectin 1. These interactions occur via two NPF motifs in the proline-rich domain of stonin 2 and Eps15 homology domains of Eps15, Eps15R, and intersectin 1. Stonin 2 also interacts indirectly with the adaptor protein complex, AP-2. In addition, stonin 2 binds to the C2B domains of synaptotagmins I and II. Overexpression of GFP-stonin 2 interferes with recruitment of AP-2 to the plasma membrane and impairs internalization of the transferrin, epidermal growth factor, and low density lipoprotein receptors. These observations suggest that stonin 2 is a novel component of the general endocytic machinery.
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Overexpression of GFP-stonin 2 interferes with recruitment of AP-2 to the plasma membrane and impairs internalization of the transferrin, epidermal growth factor, and low density lipoprotein receptors. These observations suggest that stonin 2 is a novel component of the general endocytic machinery.</abstract><cop>United States</cop><pub>Rockefeller University Press</pub><pmid>11381094</pmid><doi>10.1083/jcb.153.5.1111</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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subjects Adaptor Protein Complex alpha Subunits
Adaptor Proteins, Signal Transducing
Adaptor Proteins, Vesicular Transport
Amino Acid Sequence
Amino acids
Antibodies
Calcium-Binding Proteins - chemistry
Calcium-Binding Proteins - genetics
Calcium-Binding Proteins - metabolism
Carrier Proteins - chemistry
Carrier Proteins - genetics
Carrier Proteins - metabolism
Cell biology
Cell lines
Cell Membrane - chemistry
Cell Membrane - metabolism
Cell membranes
Cells
Cytosol - metabolism
Drosophila Proteins
Endocytosis
Endosomes - chemistry
Endosomes - metabolism
Epidermal Growth Factor - metabolism
Gene Expression Profiling
HeLa cells
Humans
Intracellular Signaling Peptides and Proteins
Membrane Glycoproteins - chemistry
Membrane Glycoproteins - metabolism
Membrane Proteins - chemistry
Membrane Proteins - genetics
Membrane Proteins - metabolism
Membranes
Molecular Sequence Data
Molecules
Nerve Tissue Proteins - chemistry
Nerve Tissue Proteins - metabolism
Neurons
Original
Phosphoproteins - chemistry
Phosphoproteins - genetics
Phosphoproteins - metabolism
Plasma
Proline - metabolism
Protein Binding
Protein Structure, Tertiary
Protein Subunits
Proteins
Receptors, LDL - metabolism
Sequence Homology, Amino Acid
Synaptotagmin II
Synaptotagmins
Transcription Factors, General
Transferrin - metabolism
Two-Hybrid System Techniques
Vesicular Transport Proteins
title Stonin 2: An Adaptor-like Protein That Interacts with Components of the Endocytic Machinery
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