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Engineering the PP7 Virus Capsid as a Peptide Display Platform.

Liangjun Zhao, Mykhailo Kopylov1, Clinton S Potter1

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Virus-like particles (VLPs) offer a versatile platform for displaying functional peptides. The PP7 bacteriophage capsid protein demonstrates enhanced tolerance for genetic modification, enabling the presentation of diverse polypeptides externally and internally.

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cryo-electron microscopypackaged enzymespeptide displayprotein nanoparticlesvirus-like particles

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Area of Science:

  • Biotechnology
  • Structural Biology
  • Nanotechnology

Background:

  • Virus-like particles (VLPs) are self-assembling nanoscale structures with broad applications.
  • Genetic and chemical modifications allow for versatile VLP engineering.
  • Leviviridae family VLPs, such as Qβ and MS2, are commonly used platforms.

Purpose of the Study:

  • To genetically modify and structurally characterize the Leviviridae PP7 capsid protein.
  • To establish PP7 as a robust platform for presenting functional polypeptides.
  • To compare the modification tolerance of PP7 with other commonly used Leviviridae VLPs.

Main Methods:

  • Genetic engineering of the PP7 capsid protein.
  • Structural characterization of modified PP7 particles.
  • Functional assessment of displayed polypeptides (e.g., cell penetrating peptide, Fc-binding domain).
  • Construction and analysis of dimeric PP7 variants.

Main Results:

  • The PP7 capsid protein tolerates C-terminal genetic fusions of polypeptides ranging from 1 kDa to 14 kDa.
  • Dimeric PP7 constructs enable presentation of exogenous loops and dual peptide display at distinct positions.
  • PP7 exhibits greater tolerance for polypeptide additions compared to Qβ and MS2 VLPs.

Conclusions:

  • The PP7 capsid protein serves as a highly adaptable platform for displaying functional polypeptides.
  • PP7's enhanced modification tolerance expands its utility in nanotechnology and biotechnology applications.
  • This engineered PP7 platform offers advantages over existing Leviviridae-derived VLPs for peptide presentation.