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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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An uncommon tail about the common γ-chain.

Stephen C Jameson1, Kristin R Renkema1

  • 1Center for Immunology, Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55414, USA.

Immunity
|June 21, 2014
PubMed
Summary

The common gamma-chain (γc) protein, usually part of cytokine receptors, can also be secreted. This secreted form inhibits cytokine responses, potentially driving autoimmune diseases.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The common gamma-chain (γc) is essential for the function of several cytokine receptors.
  • Cytokines play critical roles in immune responses and homeostasis.

Purpose of the Study:

  • To investigate a novel, non-canonical function of the common gamma-chain (γc).
  • To explore the role of secreted γc in regulating immune responses and autoimmunity.

Main Methods:

  • Utilized molecular biology techniques to study γc expression and secretion.
  • Employed cell-based assays to assess cytokine signaling inhibition.
  • Investigated the impact of secreted γc in preclinical models of autoimmunity.

Main Results:

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  • Demonstrated that γc can function as a secreted protein.
  • Showed that secreted γc inhibits specific cytokine signaling pathways.
  • Found that elevated levels of secreted γc promote the development of autoimmune conditions.

Conclusions:

  • The common gamma-chain (γc) possesses a dual role, acting both as a receptor component and a secreted immunomodulator.
  • Secreted γc represents a novel mechanism for controlling cytokine responses.
  • This finding offers new insights into the pathogenesis of autoimmunity and potential therapeutic targets.