Cited by 81Cellular transport and secretionCholesterol and Lipid MetabolismUbiquitin and proteasome pathways

The DOI matches its Crossref record; 70 of the 70 references it cites were found in a registry or an index.

IDOL Stimulates Clathrin-Independent Endocytosis and Multivesicular Body-Mediated Lysosomal Degradation of the Low-Density Lipoprotein Receptor

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Abstract

The low-density lipoprotein receptor (LDLR) is a critical determinant of plasma cholesterol levels that internalizes lipoprotein cargo via clathrin-mediated endocytosis. Here, we show that the E3 ubiquitin ligase IDOL stimulates a previously unrecognized, clathrin-independent pathway for LDLR internalization. Real-time single-particle tracking and electron microscopy reveal that IDOL is recruited to the plasma membrane by LDLR, promotes LDLR internalization in the absence of clathrin or caveolae, and facilitates LDLR degradation by shuttling it into the multivesicular body (MVB) protein-sorting pathway. The IDOL-dependent degradation pathway is distinct from that mediated by PCSK9 as only IDOL employs ESCRT (endosomal-sorting complex required for transport) complexes to recognize and traffic LDLR to lysosomes. Small interfering RNA (siRNA)-mediated knockdown of ESCRT-0 (HGS) or ESCRT-I (TSG101) components prevents IDOL-mediated LDLR degradation. We further show that USP8 acts downstream of IDOL to deubiquitinate LDLR and that USP8 is required for LDLR entry into the MVB pathway. These results provide key mechanistic insights into an evolutionarily conserved pathway for the control of lipoprotein receptor expression and cellular lipid uptake.

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Crossref · 10.1128/mcb.01716-12

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Metadata

Authors
Scotti, E., Calamai, M., Goulbourne, C. N., Zhang, L., Hong, C., Lin, R. R., Choi, J., Pilch, P. F., Fong, L. G., Zou, P., Ting, A. Y., Pavone, F. S., Young, S. G., & Tontonoz, P.
Affiliations
  • Howard Hughes Medical Institute (US)
  • Neuroscience Institute (IT)
  • University of California, Los Angeles (US)
  • Boston University (US)
  • Massachusetts Institute of Technology (US)
  • European Laboratory for Non-Linear Spectroscopy (IT)
Venue
Molecular and Cellular Biology
Published
2013-04-01
Volume
33
Issue
8
Pages
1503-1514
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2069385307
Cited by
81
References
70
Citations by year
2026: 3 · 2025: 4 · 2024: 5 · 2023: 7 · 2022: 3 · 2021: 4 · 2020: 6 · 2019: 8 · 2018: 3 · 2017: 5 · 2016: 3 · 2015: 12 · 2014: 11 · 2013: 7
FWCI
3.61
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Florence Research (University of Florence) (submittedVersion)
Funders
  • U.S. Public Health Service (CJX1-443835-WS-29646)
  • National Heart, Lung, and Blood Institute (P01HL090553, R01HL066088)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
idols, LDL receptor, clathrin-independent endocytosis, multivesicular bodies, lysosomal degradation, ESCRT complex, ESCRT-0, ESCRT-I, TSG101, USP8, deubiquitination, cholesterol homeostasis, lipoprotein uptake, caveolae, PCSK9
MeSH terms
Proprotein Convertase 9, Tsg101 Protein, Animals, Cell Line, Clathrin, DNA-Binding Proteins, Endocytosis, HeLa Cells, Humans, Lipoproteins, LDL, Lysosomes, Nuclear Proteins, Endopeptidases, Phosphoproteins, Receptors, LDL, Serine Endopeptidases, Transcription Factors, Cell Cycle Proteins, Guanine Nucleotide Exchange Factors, Protein Transport, RNA Interference, RNA, Small Interfering, Ubiquitin Thiolesterase, Proprotein Convertases, Ubiquitin-Protein Ligases, Mice, Ubiquitination, Endosomal Sorting Complexes Required for Transport, Hep G2 Cells, Multivesicular Bodies, HEK293 Cells

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