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Swine Host Protein Coiled-Coil Domain-Containing 115 (CCDC115) Interacts with Classical Swine Fever Virus Structural Glycoprotein E2 during Virus Replication

Journal Article · · Viruses
DOI:https://doi.org/10.3390/v12040388· OSTI ID:1816266
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [3];  [3]
  1. US Dept. of Homeland Security (DHS), Greenport, NY (United States). Plum Island Animal Disease Center; Mississippi State Univ., Mississippi State, MS (United States). Dept. of Pathobiology and Population Medicine; OSTI
  2. Mississippi State Univ., Mississippi State, MS (United States). Dept. of Pathobiology and Population Medicine; Univ. of Connecticut, Storrs, CT (United States). Dept. of Pathobiology and Veterinary Science
  3. US Dept. of Homeland Security (DHS), Greenport, NY (United States). Plum Island Animal Disease Center
  4. US Dept. of Homeland Security (DHS), Greenport, NY (United States). Plum Island Animal Disease Center; Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
  5. US Dept. of Homeland Security (DHS), Greenport, NY (United States). Plum Island Animal Disease Center; Kansas State Univ., Manhattan, KS (United States). Dept. of Anatomy and Physiology

Interactions between the major structural glycoprotein E2 of classical swine fever virus (CSFV) with host proteins have been identified as important factors affecting virus replication and virulence. Previously, using the yeast two-hybrid system, we identified swine host proteins specifically interacting with CSFV E2. In this report, we use a proximity ligation assay to demonstrate that swine host protein CCDC115 interacts with E2 in CSFV-infected swine cells. Using a randomly mutated E2 library in the context of a yeast two-hybrid methodology, specific amino acid mutations in the CSFV E2 protein responsible for disrupting the interaction with CCDC115 were identified. A recombinant CSFV mutant (E2ΔCCDC115v) harboring amino acid changes disrupting the E2 protein interaction with CCDC115 was produced and used as a tool to assess the role of the E2–CCDC115 interaction in viral replication and virulence in swine. CSFV E2ΔCCDC115v showed a slightly decreased ability to replicate in the SK6 swine cell line and a greater replication defect in primary swine macrophage cultures. A decreased E2–CCDC115 interaction detected by PLA is observed in cells infected with E2ΔCCDC115v. Importantly, animals intranasally infected with 105 TCID50 of E2ΔCCDC115v experienced a significantly longer survival period when compared with those infected with the parental Brescia strain. This result would indicate that the ability of CSFV E2 to bind host CCDC115 protein during infection plays an important role in virus replication in swine macrophages and in virus virulence during the infection in domestic swine.

Research Organization:
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0014664
OSTI ID:
1816266
Journal Information:
Viruses, Journal Name: Viruses Journal Issue: 4 Vol. 12; ISSN VIRUBR; ISSN 1999-4915
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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