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Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins
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Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins

Published on: August 31, 2017

Identification of host proteins associated with retroviral vector particles by proteomic analysis of highly purified

María Mercedes Segura1, Alain Garnier, Marcos Rafael Di Falco

  • 1Biotechnology Research Institute, NRC, 6100 Royalmount Avenue, Montreal, Quebec, Canada.

Journal of Virology
|November 23, 2007
PubMed

Insights

Researchers identified 27 host proteins, including membrane proteins like integrin beta1 and CD81, within Moloney murine leukemia virus (MMLV) vector particles. This discovery offers new insights into retroviral vector composition and potential applications in gene therapy.

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Moloney murine leukemia virus (MMLV) is an enveloped retrovirus known to incorporate host proteins.
  • Retroviral vectors are widely used in research and clinical settings, but their host protein composition is not fully understood.
  • Understanding host protein incorporation is crucial for optimizing retroviral vector design and function.

Purpose of the Study:

  • To identify and characterize host proteins present in purified MMLV vector particles.
  • To investigate the presence and location of host membrane proteins on retroviral vectors.
  • To explore the implications of these findings for retrovirus-mediated gene therapy.

Main Methods:

  • Purification of MMLV vector preparations using rate-zonal ultracentrifugation.
  • Separation of viral proteins via one-dimensional SDS-PAGE.
  • In-gel tryptic digestion followed by liquid chromatography/tandem mass spectrometry (LC-MS/MS) for protein identification.
  • Immunogold electron microscopy to confirm the surface localization of host proteins.

Main Results:

  • Identification of 27 distinct host proteins associated with MMLV vector particles derived from 293 HEK cells.
  • Eight host membrane proteins were identified, including integrin beta1, HMFG-E8, CD81, CD9, CD63, and Lamp-2.
  • Nineteen intracellular host proteins were also identified, alongside 5 proteins previously found in wild-type MMLV.
  • Immunogold electron microscopy confirmed the presence of host membrane proteins on the vector surface.

Conclusions:

  • The study comprehensively identifies host proteins within MMLV vector particles, revealing a significant repertoire of intracellular and membrane proteins.
  • The identified membrane proteins on the retroviral surface present opportunities for targeted delivery and purification strategies.
  • These findings enhance our understanding of retroviral vector biology and have potential implications for improving gene therapy applications.

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