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HAL-UPMC
Article . 2003
License: CC BY NC SA
Data sources: HAL-UPMC
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HAL Sorbonne Université
Article . 2003
License: CC BY NC SA
Molecular Biology of the Cell
Article . 2003 . Peer-reviewed
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The GTP/GDP Cycling of Rho GTPase TCL Is an Essential Regulator of the Early Endocytic Pathway

Authors: de Toledo, Marion; Senic-Matuglia, Francesca; Salamero, Jean; Uze, Gilles; Comunale, Franck; Fort, Philippe; Blangy, Anne;

The GTP/GDP Cycling of Rho GTPase TCL Is an Essential Regulator of the Early Endocytic Pathway

Abstract

Rho GTPases are key regulators of actin dynamics. We report that the Rho GTPase TCL, which is closely related to Cdc42 and TC10, localizes to the plasma membrane and the early/sorting endosomes in HeLa cells, suggesting a role in the early endocytic pathway. Receptor-dependent internalization of transferrin (Tf) is unaffected by suppression of endogenous TCL by small interfering RNA treatment. However, Tf accumulates in Rab5-positive uncoated endocytic vesicles and fails to reach the early endosome antigen-1–positive early endosomal compartments and the pericentriolar recycling endosomes. Moreover, Tf release upon TCL knockdown is significantly slower. Conversely, in the presence of dominant active TCL, internalized Tf accumulates in early endosome antigen-1–positive early/sorting endosomes and not in perinuclear recycling endosomes. Tf recycles directly from the early/sorting endosomes and it is normally released by the cells. The same phenotype is generated by replacing the C terminus of dominant active Cdc42 and TC10 with that of TCL, indicating that all three proteins share downstream effector proteins. Thus, TCL is essential for clathrin-dependent endocytosed receptors to enter the early/sorting endosomes. Furthermore, the active GTPase favors direct recycling from early/sorting endosomes without accumulating in the perinuclear recycling endosomes.

Country
France
Keywords

rho GTP-Binding Proteins, Endosomes, [SDV.BBM.BM] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, GTP Phosphohydrolases, [SDV.CAN] Life Sciences [q-bio]/Cancer, [SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, [SDV.BC.BC] Life Sciences [q-bio]/Cellular Biology/Subcellular Processes [q-bio.SC], Humans, RNA, Small Interfering, cdc42 GTP-Binding Protein, rab5 GTP-Binding Proteins, Reverse Transcriptase Polymerase Chain Reaction, Cell Membrane, Transferrin, [SDV.BDD.EO] Life Sciences [q-bio]/Development Biology/Embryology and Organogenesis, Immunohistochemistry, Endocytosis, Protein Structure, Tertiary, receptor-mediated, endocytosis, n-wasp, binding-proteins, mammalian-cells, early, endosomes, actin, cdc42, membrane, tc10, family, HeLa Cells, Protein Binding, Subcellular Fractions

  • BIP!
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    citations
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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
59
Top 10%
Top 10%
Top 10%
Green
bronze