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Parallel Evolution of Chemokine Binding by Structurally Related Herpesvirus Decoy Receptors

Journal Article · · Structure
 [1];  [1]
  1. Washington Univ. School of Medicine, St. Louis, MO (United States)
A wide variety of pathogens targets chemokine signaling networks in order to disrupt host immune surveillance and defense. Here, we report a structural and mutational analysis of rodent herpesvirus Peru encoded R17, a potent chemokine inhibitor that sequesters CC and C chemokines with high affinity. R17 consists of a pair of β-sandwich domains linked together by a bridging sheet, which form an acidic binding cleft for the chemokine CCL3 on the opposite face of a basic surface cluster that binds glycosaminoglycans. R17 promiscuously engages chemokines primarily through the same N-loop determinants used for host receptor recognition while residues located in the chemokine 40s loop drive kinetically stable complex formation. Here, the core fold adopted by R17 is unexpectedly similar to that of the M3 chemokine decoy receptor encoded by MHV-68, although, strikingly, neither the location of ligand engagement nor the stoichiometry of binding is conserved, suggesting that their functions evolved independently.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
NIAID
OSTI ID:
1237760
Journal Information:
Structure, Journal Name: Structure Journal Issue: 1 Vol. 24; ISSN 0969-2126
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (5)

Chemokine binding proteins: An immunomodulatory strategy going viral journal August 2016
A herpesvirus encoded Qa-1 mimic inhibits natural killer cell cytotoxicity through CD94/NKG2A receptor engagement journal December 2018
Mechanisms of immunomodulation by mammalian and viral decoy receptors: insights from structures journal December 2016
Genetically engineered two-warhead evasins provide a method to achieve precision targeting of disease-relevant chemokine subsets journal April 2018
The N-terminal domain of a tick evasin is critical for chemokine binding and neutralization and confers specific binding activity to other evasins journal February 2018

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