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Characterizing functional domains for TIM-mediated enveloped virus entry.

Sven Moller-Tank1, Lorraine M Albritton2, Paul D Rennert3

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Virus entry-enhancing receptors (PVEERs) require a phosphatidylserine (PtdSer)-binding domain and an extended stalk domain for function. A novel PVEER mimic was created, enhancing viral transduction.

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Area of Science:

  • Virology
  • Cell Biology
  • Immunology

Background:

  • T-cell immunoglobulin and mucin domain 1 (TIM-1) and related proteins act as phosphatidylserine (PtdSer)-mediated virus entry-enhancing receptors (PVEERs).
  • PVEERs bind PtdSer on viral envelopes, concentrating viruses for cellular uptake, but TIM-3, despite PtdSer binding, does not enhance entry, suggesting other domains are critical.

Purpose of the Study:

  • To define the structural features of TIM-1 necessary for its function as a PVEER.
  • To engineer a functional PVEER mimic based on identified essential domains.

Main Methods:

  • Construction and analysis of chimeric proteins and deletion mutants of TIM-1.
  • Generation of a novel PVEER mimic using domains from annexin V, α-dystroglycan, and a GPI anchor.

Main Results:

  • A functional PtdSer-binding domain and a sufficiently long stalk domain with extended structure are essential for PVEER activity.
  • Cytoplasmic and transmembrane domains are not essential if the protein remains membrane-bound.
  • The engineered mimic effectively enhanced transduction of virions with various viral glycoproteins.

Conclusions:

  • Key features for PtdSer-mediated virus entry enhancement include a PtdSer-binding domain and an extended stalk.
  • These findings provide a framework for identifying novel PVEERs and developing new antiviral strategies.