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Merkel Cell Polyomavirus Infection and Detection
13:45

Merkel Cell Polyomavirus Infection and Detection

Published on: February 7, 2019

10.5K

Characterization of self-assembled virus-like particles of Merkel cell polyomavirus

Tian-Cheng Li1, Kenji Iwasaki2, Harutaka Katano3

  • 1Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan.

Plos One
|February 12, 2015
PubMed

Insights

Merkel cell polyomavirus (MCPyV) VP1 protein self-assembles into virus-like particles (MCPyV-LPs) in insect cells. These particles package host DNA and show age-specific seroprevalence in Japan.

Area of Science:

  • Virology
  • Structural Biology
  • Epidemiology

Background:

  • Merkel cell polyomavirus (MCPyV) is linked to Merkel cell carcinoma.
  • MCPyV VP1 protein self-assembly into virus-like particles (VLPs) is crucial for understanding viral structure and infection.
  • Investigating MCPyV seroprevalence provides insights into population-level exposure and immune responses.

Purpose of the Study:

  • To characterize MCPyV-like particles (MCPyV-LPs) produced in a recombinant baculovirus system.
  • To determine the structural features and DNA packaging capabilities of MCPyV-LPs.
  • To assess the age-specific seroprevalence of MCPyV infection in the Japanese population.

Main Methods:

  • Recombinant baculovirus expression system for MCPyV VP1 protein production.
  • Cryo-electron microscopy for structural analysis of MCPyV-LPs.
  • Enzyme immunoassay (EIA) for serological detection of MCPyV antibodies.

Main Results:

  • MCPyV VP1 self-assembled into two sizes of MCPyV-LPs (~25 nm and ~50 nm) in insect cells.
  • Large MCPyV-LPs (~48 nm) packaged host DNA and exhibited a T=7 icosahedral structure with 72 pentameric capsomeres.
  • MCPyV-LPs did not share antigenic determinants with BKPyV and JCPyV.
  • Seroprevalence of MCPyV increased with age in Japanese individuals aged 1-70 years, but was lower than for BKPyV and JCPyV.

Conclusions:

  • MCPyV-LPs can be successfully produced and characterized using a baculovirus system.
  • The structural and antigenic properties of MCPyV-LPs were elucidated.
  • Age-specific seroprevalence data suggest varying exposure patterns of MCPyV compared to other polyomaviruses in Japan.

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