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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Proteome profiling of polyomavirus nuclear replication centers using iPOND.

Kimberly D Erickson1, Erika S Langsfeld1, Alexandra Holland1

  • 1The BioFrontiers Institute, University of Colorado Boulder, Boulder, Colorado, USA.

Journal of Virology
|October 31, 2024
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Summary

Researchers identified key host proteins essential for polyomavirus (PyV) DNA replication using iPOND-MS. This discovery helps distinguish replication factors from those involved in downstream processing, potentially revealing new therapeutic targets.

Keywords:
DNA tumor virusiPONDpolyomavirusproteomicsviral replication

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Area of Science:

  • Virology
  • Molecular Biology
  • Cellular Biology

Background:

  • Polyomaviruses (PyVs) are known to cause various diseases in mammals.
  • PyVs rely on host nuclear factors for viral genome replication and transcription.
  • The complete set of viral and host proteins involved in PyV replication, known as the replisome, is not fully understood.

Purpose of the Study:

  • To identify host proteins that bind to murine polyomavirus (MuPyV) DNA during and after synthesis.
  • To differentiate host factors critical for MuPyV DNA replication versus those involved in later processing stages.

Main Methods:

  • Utilized the Isolation of Proteins on Nascent DNA coupled with Mass Spectrometry (iPOND-MS) technique.
  • Analyzed proteins bound to MuPyV DNA immediately after synthesis and at 2 hours post-synthesis.

Main Results:

  • Identified novel MuPyV DNA interactors on newly synthesized viral DNA (vDNA), including MCM complex members, DNA primase, DNA polymerase alpha, DNA ligase, and replication factor C.
  • Observed that host and viral proteins bound to MuPyV DNA at 2 hours post-synthesis differed from those on newly synthesized vDNA, with a lack of many replication proteins.

Conclusions:

  • The study distinguishes between host factors essential for MuPyV DNA replication and those involved in downstream processing.
  • Understanding these host-viral interactions may lead to the identification of therapeutic targets to suppress PyV replication.