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This study compared two feline leukemia virus subgroup B (FeLV-B) strains, finding their host range differences are mainly due to the receptor binding domain. For FeLV-B-90Z, the C terminus also influences Pit1 ortholog recognition.

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Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Feline leukemia virus subgroup B (FeLV-B) is a significant pathogen in cats.
  • Understanding FeLV-B host range is crucial for developing control strategies.
  • Differences in viral envelopes can dictate host tropism.

Purpose of the Study:

  • To investigate the molecular basis for host range variations between two FeLV-B strains.
  • To determine the role of specific envelope domains in receptor utilization.

Main Methods:

  • Retrovirus vectors were engineered to express envelopes from FeLV-B-90Z and FeLV-B-GA strains.
  • Binding and infectivity assays were performed using cells expressing different Pit1 orthologs.
  • Comparative analysis of envelope-receptor interactions was conducted.

Main Results:

  • Both FeLV-B envelopes utilized Pit1 orthologs, but with distinct patterns.
  • The receptor binding domain was the primary determinant of Pit1 ortholog utilization.
  • The C terminus of the FeLV-B-90Z envelope also contributed to recognizing specific Pit1 orthologs.

Conclusions:

  • Host range of FeLV-B is influenced by specific domains within its envelope proteins.
  • The receptor binding domain and, in some cases, the C terminus, dictate tropism by interacting with Pit1 orthologs.
  • These findings provide insights into FeLV-B evolution and host adaptation.