Multiple TSC22D4 iso-/phospho-glycoforms display idiosyncratic subcellular localizations and interacting protein

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Updated: May 15, 2026

Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography
10:50

Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography

Published on: March 9, 2010

Sonia Canterini1, Valentina Carletti, Stefania Nusca

  • 1Department of Psychology, Pasteur Institute-Cenci Bolognetti Foundation and Daniel Bovet Neurobiology Research Center, Sapienza University of Rome, Rome, Italy.

The FEBS Journal
|January 12, 2013
PubMed

Insights

TSC22D4 protein forms exhibit distinct subcellular localizations and interact with different partners during neuronal differentiation, revealing form-specific functions in cell processes like proliferation and apoptosis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • TSC22D proteins, including TSC22D1 and TSC22D4, are crucial for cell proliferation, differentiation, and apoptosis.
  • Their interaction mechanisms and functional roles remain largely uncharacterized.

Purpose of the Study:

  • To biochemically characterize different TSC22D4 forms.
  • To determine their subcellular localization and protein interactions during cerebellar granule neuron (CGN) differentiation.

Main Methods:

  • Biochemical characterization of TSC22D4 splice variants (42 and 55 kDa) and post-translationally modified forms (67 and 72 kDa).
  • Analysis of subcellular localization and protein partners in undifferentiated and differentiated CGNs.

Main Results:

  • TSC22D4-42 localizes to the cytosol and interacts with TSC22D1.2 in undifferentiated CGNs.
  • TSC22D4-55 associates with the nuclear matrix in differentiated CGNs.
  • TSC22D4-67 localizes to cytosol, nuclei, and mitochondria, interacting with apoptosis factors.
  • TSC22D4-72, O-GlcNAcylated and phosphorylated, binds to chromatin.

Conclusions:

  • Different TSC22D4 forms display unique subcellular distributions and interaction profiles during CGN differentiation.
  • These findings suggest form-specific functions for TSC22D proteins and offer a framework for further research.

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