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"Glyco-sulfo barcodes" regulate chemokine receptor function.

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|February 2, 2023
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Summary
This summary is machine-generated.

Post-translational modifications like O-glycosylation and tyrosine sulfation fine-tune chemokine receptor CCR5 signaling. These modifications impact interactions with chemokine ligands, influencing leukocyte migration.

Keywords:
Chemokine receptorG protein-coupled receptorO-glycosylationTyrosine sulfation

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Chemokine ligands and receptors are crucial for leukocyte directional migration.
  • Post-translational modifications, including O-glycosylation and tyrosine sulfation, affect chemokine receptor function.

Purpose of the Study:

  • To investigate the role of O-glycosylation and tyrosine sulfation on CC chemokine receptor 5 (CCR5) function.
  • To identify conserved glycosylation and sulfation sites on human and murine CC chemokine receptors.

Main Methods:

  • In silico analysis to predict conserved O-glycosylation and sulfation sites.
  • Utilized glyco-engineered Chinese Hamster Ovary (CHO) cell lines to assess O-glycosylation impact on CCR5.
  • Employed tyrosine residue mutation and sodium chlorate treatment to evaluate tyrosine sulfation effects on CCR5.

Main Results:

  • Altering O-glycosylation or tyrosine sulfation on CCR5 significantly reduced signaling induced by charged chemokines CCL5 and CCL8, but less so for CCL3.
  • Loss of sialic acids minimally affected CCL3-induced signal transduction.
  • Enzymes GalNAc-T1 and GalNAc-T11 were identified as key players in chemokine receptor O-glycosylation.

Conclusions:

  • O-glycosylation and tyrosine sulfation are critical for fine-tuning chemokine interactions with CCR5.
  • These modifications play a significant role in the recognition of chemokine ligands and subsequent signaling pathways.
  • Understanding these modifications provides insights into regulating leukocyte migration.