Cited by 42Cellular transport and secretionAutophagy in Disease and TherapyCalcium signaling and nucleotide metabolism

De novo formation of early endosomes during Rab5-to-Rab7a transition

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Skjeldal, Frode Miltzow, Haugen, Linda Hofstad, Mateus, Duarte, Frei, Dominik M., Rødseth, Anna Vik, Hu, Xian, Bakke, Oddmund·2021·Journal of Cell Science

Published version of a preprint

Abstract

Rab5 and Rab7a are the main determinants of early and late endosomes and are important regulators of endosomal progression. The transport from early endosomes to late endosome seems to be regulated through an endosomal maturation switch, where Rab5 is gradually exchanged by Rab7a on the same endosome. Here, we provide new insight into the mechanism of endosomal maturation, for which we have discovered a stepwise Rab5 detachment, sequentially regulated by Rab7a. The initial detachment of Rab5 is Rab7a independent and demonstrates a diffusion-like first-phase exchange between the cytosol and the endosomal membrane, and a second phase, in which Rab5 converges into specific domains that detach as a Rab5 indigenous endosome. Consequently, we show that early endosomal maturation regulated through the Rab5-to-Rab7a switch induces the formation of new fully functional Rab5-positive early endosomes. Progression through stepwise early endosomal maturation regulates the direction of transport and, concomitantly, the homeostasis of early endosomes.

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Crossref · 10.1242/jcs.254185

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  • Internalized cargo localizes to late endosomes approximately 10 minutes after uptake.

    “previous studies established that internalized cargo localizes to late endosomes ~10 minutes after uptake29–31”

    From INPP5D/SHIP1 regulates endo-lysosomal function and cargo-selective phagocytosis in human microglia (2025) · cites this paper as [30]

    The Introduction describes transport of internalized material through early-to-late endosomal maturation, supporting the general destination. But the Results’ minute-scale measurements concern Rab5 detachment and Rab7a recruitment during maturation, not when cargo reaches late endosomes after uptake. The cited paper does not establish the approximately 10-minute timing. (LLM, conf=0.78)

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Authors
Skjeldal, F. M., Haugen, L. H., Mateus, D., Frei, D. M., Rødseth, A. V., Hu, X., & Bakke, O.
Affiliations
University of Oslo (NO)
Corresponding author
Bakke, Oddmund
Venue
Journal of Cell Science
Published
2021-04-15
Volume
134
Issue
8
ISSN
  • 0021-9533 (ISSN-L)
  • 1477-9137
OpenAlex
W3136209092
Cited by
41
References
54
Citations by year
2026: 12 · 2025: 12 · 2024: 6 · 2023: 3 · 2022: 6 · 2021: 2
FWCI
2.22
Type
journal article
Language
en
Open access
Locations
  • Journal of Cell Science (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • NORA - Norwegian Open Research Archives (submittedVersion, cc-by)
Funders
  • The Norwegian Cancer Scociety (grant 113472 to O.B)
  • The Research Council of Norway (grants 214183 and 230770 to O.B)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
Keywords
Rab5, Rab7, early endosomes, late endosomes, endosomal maturation, endosomal transport
MeSH terms
Endosomes, rab5 GTP-Binding Proteins, Transport Vesicles

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