Cited by 160Cytokine Signaling Pathways and InteractionsCellular transport and secretionReceptor Mechanisms and Signaling

A Di-leucine Motif and an Upstream Serine in the Interleukin-6 (IL-6) Signal Transducer gp130 Mediate Ligand-induced Endocytosis and Down-regulation of the IL-6 Receptor

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Dittrich, Elke, Haft, Carol Renfrew, Muys, Leon, Heinrich, Peter C., Graeve, Lutz·1996·Journal of Biological Chemistry

Abstract

The interleukin-6 (IL-6) receptor complex is composed of two different subunits, the IL-6 binding protein (IL-6R, gp80) and the signal transducing component gp130. Our previous studies revealed that the 10-amino acid sequence TQPLLDSEER within the intracellular domain of gp130 is crucial for the efficient internalization of IL-6. Since this sequence contains a putative di-leucine internalization motif, we further analyzed this region by constructing two additional deletions and a series of point mutants. Analyses of these mutants showed that the di-leucine pair (Leu-145 and Leu-146) is essential for ligand internalization, with leucine 145 being less resilient to exchanges. Furthermore, when a chimeric protein (Tac-STQPLL) composed of the Tac antigen fused to the hexapeptide STQPLL of gp130 was studied, we found that this sequence is sufficient to mediate endocytosis and lysosomal targeting of the chimera. Mutational analysis of three serine residues upstream of the di-leucine motif revealed that mutation of serine 139 to an alanine reduces the initial internalization rate by 50%. This finding suggests that a serine phosphorylation may be important for rapid endocytosis.

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Crossref · 10.1074/jbc.271.10.5487

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  • The cytoplasmic domain of LRAD3 contains a conserved dileucine motif.

    “Instead, the cytoplasmic domain of LRAD3 contains a conserved dileucine motif which has been demonstrated to mediate endocytosis and sorting of many receptors, including CD3 (Letourneur and Klausner, 1992), IgG Fc receptors (Hunziker and Fumey, 1994), the IL-6 receptor (Dittrich et al., 1996), and CD44 (Sheikh and Isacke, 1996).”
  • The dileucine motif mediates endocytosis and sorting of many receptors.

    “the cytoplasmic domain of LRAD3 contains a conserved dileucine motif which has been demonstrated to mediate endocytosis and sorting of many receptors, including CD3 (Letourneur and Klausner, 1992), IgG Fc receptors (Hunziker and Fumey, 1994), the IL-6 receptor (Dittrich et al., 1996), and CD44 (Sheikh and Isacke, 1996).”

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Authors
Dittrich, E., Haft, C. R., Muys, L., Heinrich, P. C., & Graeve, L.
Affiliations
  • RWTH Aachen University (DE)
  • National Institutes of Health (US)
Corresponding author
Graeve, Lutz
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1996-03
Volume
271
Issue
10
Pages
5487-5494
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2016409733
Cited by
160
References
50
Citations by year
2025: 2 · 2023: 3 · 2021: 3 · 2020: 2 · 2018: 2 · 2017: 3 · 2016: 4 · 2015: 8 · 2014: 4 · 2013: 2 · 2012: 4
FWCI
7.04
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
IL-6 receptor, gp130, dileucine motif, endocytosis, receptor down-regulation, serine phosphorylation, ligand internalization, lysosomal targeting, point mutations, cytoplasmic domain
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Binding Sites, Cell Line, Cell Membrane, Chlorocebus aethiops, DNA Mutational Analysis, Endocytosis, Humans, Kinetics, Leucine, Ligands, Lysosomes, Membrane Glycoproteins, Molecular Sequence Data, Oligodeoxyribonucleotides, Phosphorylation, Recombinant Proteins, Serine, Time Factors, Transfection, Signal Transduction, Down-Regulation, Antigens, CD, Interleukin-6, Mutagenesis, Mutagenesis, Site-Directed, Point Mutation, Sequence Deletion, Receptors, Interleukin, Receptors, Interleukin-6, Cytokine Receptor gp130

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