Cited by 41Cellular transport and secretionUbiquitin and proteasome pathwaysFungal and yeast genetics research

Gga2 mediates sequential ubiquitin-independent and ubiquitin-dependent steps in the trafficking of ARN1 from the trans-Golgi network to the vacuole.

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Deng, Yi, Guo, Yan, Watson, Hadiya, Au, Wei-Chun, Shakoury-Elizeh, Minoo, Basrai, Munira A., Bonifacino, Juan S., Philpott, Caroline C.·2009·Journal of Biological Chemistry

Abstract

In Saccharomyces cerevisiae, ARN1 encodes a transporter for the uptake of ferrichrome, an important nutritional source of iron. In the absence of ferrichrome, Arn1p is sorted directly from the trans-Golgi network (TGN) to the vacuolar lumen via the vacuolar protein-sorting pathway. Arn1p is mis-sorted to the plasma membrane in cells lacking Gga2p, a monomeric clathrin-adaptor protein involved in vesicular transport from the TGN. Although Ggas have been characterized as ubiquitin receptors, we show here that ubiquitin binding by Gga2 was not required for the TGN-to-endosome trafficking of Arn1, but it was required for subsequent sorting of Arn1 into the multivesicular body. In a ubiquitin-binding mutant of Gga2, Arn1p accumulated on the vacuolar membrane in a ubiquitinated form. The yeast epsins Ent3p and Ent4p were also involved in TGN-to-vacuole sorting of Arn1p. Amino-terminal sequences of Arn1p were required for vacuolar protein sorting, as mutation of ubiquitinatable lysine residues resulted in accumulation on the vacuolar membrane, and mutation of either a THN or YGL sequence resulted in mis-sorting to the plasma membrane. These studies suggest that Gga2 is involved in sorting at both the TGN and multivesicular body and that the first step can occur without ubiquitin binding.

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Crossref · 10.1074/jbc.m109.030015

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Authors
Deng, Y., Guo, Y., Watson, H., Au, W.-C., Shakoury-Elizeh, M., Basrai, M. A., Bonifacino, J. S., & Philpott, C. C.
Affiliations
  • National Institutes of Health (US)
  • National Institute of Diabetes and Digestive and Kidney Diseases (US)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (US)
Corresponding author
Philpott, Caroline C.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-08
Volume
284
Issue
35
Pages
23830-23841
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2155611185
Cited by
41
References
54
Citations by year
2026: 3 · 2022: 3 · 2021: 2 · 2020: 3 · 2019: 3 · 2018: 1 · 2017: 2 · 2016: 2 · 2015: 2 · 2013: 3 · 2012: 4
FWCI
2.37
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
Keywords
GGA2, trans-Golgi network, vacuolar protein sorting, multivesicular bodies, ubiquitin binding, clathrin adaptor proteins, vesicle trafficking, iron acquisition, Saccharomyces cerevisiae
MeSH terms
Amino Acid Sequence, Molecular Sequence Data, Protein Binding, Saccharomyces cerevisiae, Vacuoles, Sequence Alignment, Protein Transport, trans-Golgi Network, Ubiquitin, Membrane Transport Proteins, Saccharomyces cerevisiae Proteins, Adaptor Proteins, Vesicular Transport

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