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Function of the RNA Coliphage Qβ Proteins in Medical In Vitro Evolution.

Rana L Singleton1, Carrie A Sanders2, Kevin Jones3

  • 1Department of Biological Sciences, College STEM, 1627 Hall Street, Montgomery, AL 36101, USA. rls0055@tigermail.auburn.edu.

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|June 6, 2019
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Summary

Qβ phage technology enables in vitro evolution of viral antigens and epitopes for vaccine development. This platform facilitates rapid selection and engineering of foreign peptides, overcoming challenges in vaccine design for plastic viruses.

Keywords:
Qβfoot-and-mouth disease virus (FMDV)human immunodeficiency virus (HIV)in vitro evolutionmembrane proximal external region (MPER)proofreadingread-through protein A1

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Qβ is a single-stranded RNA bacteriophage with a robust icosahedral shell, belonging to the Leviviridae family.
  • Its genome codes for four proteins, including coat proteins and key infection-related proteins like replicase, A2, and A1 (read-through protein).
  • The A1 protein's C-terminus acts as a linker for displaying foreign peptides, making Qβ a versatile platform for in vitro evolution.

Purpose of the Study:

  • To leverage Qβ phage platform technology for in vitro evolution and selection of viral antigens and epitopes.
  • To engineer Qβ phages displaying specific viral epitopes for potential vaccine development.
  • To address challenges in vaccine design posed by viral plasticity and ineffective epitope presentation.

Main Methods:

  • Utilizing the Qβ phage RNA platform to display peptide libraries, including the G-H loop of foot-and-mouth disease virus (FMDV) VP1 protein.
  • Engineering Qβ phages by fusing membrane proximal external region (MPER) epitopes of human immunodeficiency virus type 1 (HIV-1) with A1 proteins.
  • Evolving and selecting engineered phages using specific monoclonal antibodies (mAbs) or antibodies against the displayed epitopes.

Main Results:

  • Hybrid Qβ phages displaying FMDV VP1 epitopes were selected using anti-FMDV mAbs, showing potential for FMDV vaccine development.
  • Engineered Qβ phages displaying HIV-1 MPER epitopes were recognized by specific antibodies, demonstrating effective presentation of these challenging epitopes.
  • The Qβ system successfully randomized and evolved key epitope portions, highlighting its utility for studying viral evolution.

Conclusions:

  • The Qβ phage platform is exceptionally suited for in vitro evolution and selection of viral antigens and epitopes.
  • This technology offers a promising approach to overcome viral plasticity and challenges in developing effective vaccines against viruses like FMDV and HIV-1.
  • Engineered Qβ phages can be used for vaccine efficacy evaluation, potentially replacing the need for live viruses in certain studies.