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PMID:16164598

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Citation

Kaneko, T, Maeda, A, Takefuji, M, Aoyama, H, Nakayama, M, Kawabata, S, Kawano, Y, Iwamatsu, A, Amano, M and Kaibuchi, K (2005) Rho mediates endocytosis of epidermal growth factor receptor through phosphorylation of endophilin A1 by Rho-kinase. Genes Cells 10:973-87

Abstract

After binding of epidermal growth factor (EGF), the EGF receptor is activated, internalized by endocytosis, and subsequently degraded in the lysosomal pathway. Endocytotic trafficking of the activated EGF receptor is essential for controlling EGF signaling. Upon ligand-induced activation of EGF receptors, Cbl (ubiquitin ligase) binds to the activated receptor and leads to translocation of the CIN85 (Cbl-interacting protein of 85 kDa)/endophilin complex in the vicinity of the activated EGF receptors. Endophilin is known as a key regulator of clathrin-mediated endocytosis, and the translocation of endophilin in the vicinity of active EGF receptor is thought to promote receptor internalization. The constitutively active mutant of small GTPase Rho inhibits EGF receptor endocytosis. In this study, we found that this inhibitory effect was canceled by the dominant negative form of Rho-associated kinase (Rho-kinase), which is an effector of Rho. To clarify the molecular mechanisms of endocytosis downstream of Rho/Rho-kinase signal, we searched for and identified endophilin A1 as a novel substrate of Rho-kinase. We identified the phosphorylation site of endophilin A1 at Thr-14 and made endophilin T14D (substitution of Thr-14 by Asp), which is expected to mimic the phosphorylation state of endophilin A1. Endophilin T14D inhibited EGF receptor internalization. Furthermore, phosphorylation of endophilin by Rho-kinase inhibited the binding to CIN85. Taken together, these results suggest that Rho-kinase phosphorylates endophilin downstream of Rho and regulates EGF receptor endocytosis through the inhibition of binding between endophilin and CIN85.

Links

PubMed Online version:10.1111/j.1365-2443.2005.00895.x

Keywords

Acyltransferases/metabolism; Adaptor Proteins, Signal Transducing/metabolism; Amino Acid Sequence; Animals; Brain/cytology; Brain/metabolism; COS Cells; Cattle; Cells, Cultured; Cercopithecus aethiops; Endocytosis/physiology; Intracellular Signaling Peptides and Proteins; Molecular Sequence Data; PC12 Cells; Phosphorylation; Protein Binding; Protein-Serine-Threonine Kinases/metabolism; Rats; Receptor, Epidermal Growth Factor/metabolism; Receptor, Epidermal Growth Factor/physiology; Transfection; rho-Associated Kinases; rhoA GTP-Binding Protein/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

MOUSE:SH3G2

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q925Q9

F

Seeded From UniProt

complete

MOUSE:SH3G2

acts_upstream_of_or_within

GO:0002090: regulation of receptor internalization

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:SH3K1

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q99962

F

Seeded From UniProt

complete

HUMAN:SH3G2

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q96B97

F

Seeded From UniProt

complete


See also

References

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