2. Academic Validation
  3. Glycosylation Regulates N-Terminal Proteolysis and Activity of the Chemokine CCL14

Glycosylation Regulates N-Terminal Proteolysis and Activity of the Chemokine CCL14

  • ACS Chem Biol. 2021 Jun 18;16(6):973-981. doi: 10.1021/acschembio.1c00006.
Siyao Wang 1,  Simon R Foster 2 3,  Julie Sanchez 2 3,  Leo Corcilius 1 4,  Mark Larance 5,  Meritxell Canals 6 7,  Martin J Stone 2,  Richard J Payne 1 4
Affiliations

Affiliations

  • 1 School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.
  • 2 Department of Biochemistry & Molecular Biology Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia.
  • 3 Infection & Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia.
  • 4 Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, NSW 2006, Australia.
  • 5 Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia.
  • 6 Division of Physiology, Pharmacology and Neuroscience, School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, U.K.
  • 7 Centre of Membrane Proteins and Receptors, University of Birmingham and University of Nottingham, Midlands, U.K.
PMID: 33988967 DOI: 10.1021/acschembio.1c00006
Abstract

Chemokines are secreted proteins that regulate leukocyte migration during inflammatory responses by signaling through chemokine receptors. Full length CC chemokine ligand 14, CCL14(1-74), is a weak agonist for the Chemokine Receptor CCR1, but its activity is substantially enhanced upon proteolytic cleavage to CCL14(9-74). CCL14 is O-glycosylated at Ser7, adjacent to the site of proteolytic activation. To determine whether glycosylation regulates the activity of CCL14, we used native chemical ligation to prepare four homogeneously glycosylated variants of CCL14(1-74). Each protein was assembled from three synthetic peptide fragments in "one-pot" using two sequential ligation reactions. We show that while glycosylation of CCL14(1-74) did not affect CCR1 binding affinity or potency of activation, sialylated variants of CCL14(1-74) exhibited reduced activity after treatment with plasmin compared to nonsialylated forms. These data indicate that glycosylation may influence the biological activity of CCL14 by regulating its conversion from the full-length to the truncated, activated form.

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