Crossref journal-article
The Company of Biologists
Journal of Cell Science (237)
Abstract

ABSTRACT Ypt51p, a small GTPase of Saccharomyces cerevisiae, has been previously identified as a structural homolog of mammalian Rab5. Although disruption analysis revealed that the protein is required for endocytic transport and for vacuolar protein sorting, the precise step controlled by Ypt51p was not determined. In this work we show that by heterologous expression in animal cells Ypt51p was targeted to Rab5-positive early endosomes and stimulated endocytosis. Furthermore, two Ypt51p mutants induced similar morphological alterations as the corresponding Rab5 mutants. Also in yeast cells Ypt51p was found to be required at an early step in endocytic membrane traffic, since α-factor accumulated in an early endocytic inter-mediate in the absence of Ypt51p. Cell fractionation analysis revealed cofractionation of Ypt51p with endocytic intermediates, while no association with the late Golgi com-partment could be detected. Indirect immunofluorescence microscopy allowed us to morphologically identify the Ypt51p-containing compartment. Similar to the mammalian system larger Ypt51p-positive structures were revealed upon expression of Ypt51p Q66L. These structures were also positive for α-factor receptor and for car-boxypeptidase Y, thus providing direct evidence for their endocytic nature and for the convergence of the vacuolar biosynthetic and endocytic pathways.

Bibliography

Singer-Krüger, B., Stenmark, H., & Zerial, M. (1995). Yeast ypt51p and mammalian rab5: Counterparts with similar function in the early endocytic pathway. Journal of Cell Science, 108(11), 3509–3521.

Authors 3
  1. Birgit Singer-Krüger (first)
  2. Harald Stenmark (additional)
  3. Marino Zerial (additional)
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Dates
Type When
Created 4 years, 4 months ago (April 23, 2021, 10:30 p.m.)
Deposited 1 year, 8 months ago (Dec. 26, 2023, 5:24 p.m.)
Indexed 1 year, 6 months ago (Feb. 16, 2024, 7:32 p.m.)
Issued 29 years, 9 months ago (Nov. 1, 1995)
Published 29 years, 9 months ago (Nov. 1, 1995)
Published Online 29 years, 9 months ago (Nov. 1, 1995)
Published Print 29 years, 9 months ago (Nov. 1, 1995)
Funders 0

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@article{Singer_Kr_ger_1995, title={Yeast ypt51p and mammalian rab5: Counterparts with similar function in the early endocytic pathway}, volume={108}, ISSN={1477-9137}, url={http://dx.doi.org/10.1242/jcs.108.11.3509}, DOI={10.1242/jcs.108.11.3509}, number={11}, journal={Journal of Cell Science}, publisher={The Company of Biologists}, author={Singer-Krüger, Birgit and Stenmark, Harald and Zerial, Marino}, year={1995}, month=nov, pages={3509–3521} }