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Developmental Cell
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Developmental Cell
Article . 2015
License: Elsevier Non-Commercial
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Developmental Cell
Article . 2015 . Peer-reviewed
License: Elsevier Non-Commercial
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The Pallbearer E3 Ligase Promotes Actin Remodeling via RAC in Efferocytosis by Degrading the Ribosomal Protein S6

Authors: Xiao, Hui; Wang, Hui; Silva, Elizabeth A.; Thompson, James; Guillou, Aurélien; Yates, John R.; Buchon, Nicolas; +1 Authors

The Pallbearer E3 Ligase Promotes Actin Remodeling via RAC in Efferocytosis by Degrading the Ribosomal Protein S6

Abstract

Clearance of apoptotic cells (efferocytosis) is achieved through phagocytosis by professional or amateur phagocytes. It is critical for tissue homeostasis and remodeling in all animals. Failure in this process can contribute to the development of inflammatory autoimmune or neurodegenerative diseases. We found previously that the PALL-SCF E3-ubiquitin ligase complex promotes apoptotic cell clearance, but it remained unclear how it did so. Here we show that the F-box protein PALL interacts with phosphorylated ribosomal protein S6 (RpS6) to promote its ubiquitylation and proteasomal degradation. This leads to RAC2 GTPase upregulation and activation and F-actin remodeling that promotes efferocytosis. We further show that the specific role of PALL in efferocytosis is driven by its apoptotic cell-induced nuclear export. Finding a role for RpS6 in the negative regulation of efferocytosis provides the opportunity to develop new strategies to regulate this process.

Keywords

Proteasome Endopeptidase Complex, Ribosomal Protein S6, Ubiquitin-Protein Ligases, Ubiquitination, rac GTP-Binding Proteins, Animals, Genetically Modified, Actin Cytoskeleton, Drosophila melanogaster, Phagocytosis, Tandem Mass Spectrometry, Animals, Immunoprecipitation, Phosphorylation, Developmental Biology, Signal Transduction

  • BIP!
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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    25
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
Powered by OpenAIRE graph
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
25
Top 10%
Average
Top 10%
hybrid