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Rab15 differentially regulates early endocytic trafficking.

P A Zuk1, L A Elferink

  • 1Department of Biological Sciences, Wayne State University, Detroit, Michigan 48202, USA.

The Journal of Biological Chemistry
|June 6, 2000
PubMed
Summary
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Rab15 (HArab15) regulates early endocytosis by controlling early endosome fusion. Active Rab15 inhibits endocytosis, while inactive forms stimulate it, suggesting a counteracting role to Rab5 in membrane trafficking.

Area of Science:

  • Cell biology
  • Molecular biology
  • Membrane trafficking

Background:

  • Rab GTPases are key regulators of intracellular membrane trafficking.
  • Rab15 (HArab15) localizes to early endosomal membranes.
  • Understanding Rab15's role in endocytosis is crucial for deciphering cellular transport.

Purpose of the Study:

  • To characterize the function of Rab15 in endocytosis using functional mutants.
  • To investigate Rab15's influence on early endocytic trafficking and fusion events.
  • To determine Rab15's interaction with Rab5 in regulating endocytosis.

Main Methods:

  • Preparation and analysis of functional Rab15 mutants (wild-type, Q67L, T22N, N121I).
  • Assessment of fluid phase and receptor-mediated endocytosis rates.

Related Experiment Videos

  • In vitro assays for homotypic early endosome fusion.
  • Examination of Rab5-stimulated endocytosis in cells overexpressing Rab15 mutants.

    • Main Results:

    • Active Rab15 (Q67L) inhibits early endocytosis and homotypic fusion.
    • Inactive Rab15 mutants stimulate early endocytosis and fusion.
    • Inactive Rab15 mutants differentially affect endocytic tracer transit and recycling.
    • Active Rab15 attenuates Rab5-stimulated endocytosis, while inactive Rab15 augments it.

    Conclusions:

    • Rab15 plays a regulatory role in early endocytosis, potentially counteracting Rab5.
    • Rab15 differentially regulates membrane trafficking steps through early/sorting and recycling endosomes.
    • Functional states of Rab15 (active vs. inactive) have distinct effects on endocytic pathways.