Chemokine binding to PSGL-1 is controlled by O-glycosylation and tyrosine sulfation

Research output: Contribution to journalJournal articleResearchpeer-review

  • Christoffer K. Goth
  • Akul Y. Mehta
  • Alyssa M. McQuillan
  • Kelly J. Baker
  • Melinda S. Hanes
  • Simon S. Park
  • Kathrin Stavenhagen
  • Hjortø, Gertrud Malene
  • Jamie Heimburg-Molinaro
  • Elliot L. Chaikof
  • Rosenkilde, Mette
  • Richard D. Cummings

Protein glycosylation influences cellular recognition and regulates protein interactions, but how glycosylation functions alongside other common posttranslational modifications (PTMs), like tyrosine sulfation (sTyr), is unclear. We produced a library of 53 chemoenzymatically synthesized glycosulfopeptides representing N-terminal domains of human and murine P-selectin glycoprotein ligand-1 (PSGL-1), varying in sTyr and O-glycosylation (structure and site). Using these, we identified key roles of PSGL-1 O-glycosylation and sTyr in controlling interactions with specific chemokines. Results demonstrate that sTyr positively affects CCL19 and CCL21 binding to PSGL-1 N terminus, whereas O-glycan branching and sialylation reduced binding. For murine PSGL-1, interference between PTMs is greater, attributed to proximity between the two PTMs. Using fluorescence polarization, we found sTyr is a positive determinant for some chemokines. We showed that synthetic sulfopeptides are potent in decreasing chemotaxis of human dendritic cells toward CCL19 and CCL21. Our results provide new research avenues into the interplay of PTMs regulating leukocyte/chemokine interactions.

Original languageEnglish
JournalCell Chemical Biology
Issue number8
Pages (from-to)893-905.e7
Publication statusPublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

    Research areas

  • CCL19, CCL21, CCL5, chemokine, glycosulfopeptides, O-glycan, P-selectin, PSGL-1, tyrosine sulfation

ID: 365961389