Serine and Threonine Phosphorylation of the Low Density Lipoprotein Receptor-related Protein by Protein Kinase Cα Regulates Endocytosis and Association with Adaptor Molecules
The low density lipoprotein receptor-related protein (LRP) is a large receptor that participates in endocytosis, signaling pathways, and phagocytosis of necrotic cells. Mechanisms that direct LRP to function in these distinct pathways likely involve its association with distinct cytoplasmic adaptor...
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Published in | The Journal of biological chemistry Vol. 279; no. 39; p. 40536 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
American Society for Biochemistry and Molecular Biology
24.09.2004
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Abstract | The low density lipoprotein receptor-related protein (LRP) is a large receptor that participates in endocytosis, signaling
pathways, and phagocytosis of necrotic cells. Mechanisms that direct LRP to function in these distinct pathways likely involve
its association with distinct cytoplasmic adaptor proteins. We tested the hypothesis that the association of various adaptor
proteins with the LRP cytoplasmic domain is modulated by its phosphorylation state. Phosphoamino acid analysis of metabolically
labeled LRP revealed that this receptor is phosphorylated at serine, threonine, and tyrosine residues within its cytoplasmic
domain, whereas inhibitor studies identified protein kinase Cα (PKCα) as a kinase capable of phosphorylating LRP. Mutational
analysis identified critical threonine and serine residues within the LRP cytoplasmic domain that are necessary for phosphorylation
mediated by PKCα. Mutating these threonine and serine residues to alanines generated a receptor that was not phosphorylated
and that was internalized more rapidly than wild-type LRP, revealing that phosphorylation reduces the association of LRP with
adaptor molecules of the endocytic machinery. In contrast, serine and threonine phosphorylation was necessary for the interaction
of LRP with Shc, an adaptor protein that participates in signaling events. Furthermore, serine and threonine phosphorylation
increased the interaction of LRP with other adaptor proteins such as Dab-1 and CED-6/GULP. These results indicate that phosphorylation
of LRP by PKCα modulates the endocytic and signaling function of LRP by modifying its association with adaptor proteins. |
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AbstractList | The low density lipoprotein receptor-related protein (LRP) is a large receptor that participates in endocytosis, signaling
pathways, and phagocytosis of necrotic cells. Mechanisms that direct LRP to function in these distinct pathways likely involve
its association with distinct cytoplasmic adaptor proteins. We tested the hypothesis that the association of various adaptor
proteins with the LRP cytoplasmic domain is modulated by its phosphorylation state. Phosphoamino acid analysis of metabolically
labeled LRP revealed that this receptor is phosphorylated at serine, threonine, and tyrosine residues within its cytoplasmic
domain, whereas inhibitor studies identified protein kinase Cα (PKCα) as a kinase capable of phosphorylating LRP. Mutational
analysis identified critical threonine and serine residues within the LRP cytoplasmic domain that are necessary for phosphorylation
mediated by PKCα. Mutating these threonine and serine residues to alanines generated a receptor that was not phosphorylated
and that was internalized more rapidly than wild-type LRP, revealing that phosphorylation reduces the association of LRP with
adaptor molecules of the endocytic machinery. In contrast, serine and threonine phosphorylation was necessary for the interaction
of LRP with Shc, an adaptor protein that participates in signaling events. Furthermore, serine and threonine phosphorylation
increased the interaction of LRP with other adaptor proteins such as Dab-1 and CED-6/GULP. These results indicate that phosphorylation
of LRP by PKCα modulates the endocytic and signaling function of LRP by modifying its association with adaptor proteins. |
Author | Chun-Xiang Liu Bradley T. Hyman Ithan D. Peltan Sripriya Ranganathan Irina Mikhailenko Dudley K. Strickland Christine A. F. von Arnim Mary M. Migliorini |
Author_xml | – sequence: 1 fullname: Sripriya Ranganathan – sequence: 2 fullname: Chun-Xiang Liu – sequence: 3 fullname: Mary M. Migliorini – sequence: 4 fullname: Christine A. F. von Arnim – sequence: 5 fullname: Ithan D. Peltan – sequence: 6 fullname: Irina Mikhailenko – sequence: 7 fullname: Bradley T. Hyman – sequence: 8 fullname: Dudley K. Strickland |
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Title | Serine and Threonine Phosphorylation of the Low Density Lipoprotein Receptor-related Protein by Protein Kinase Cα Regulates Endocytosis and Association with Adaptor Molecules |
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