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A Viral Pilot for HCMV Navigation?

Barbara Adler1

  • 1Max von Pettenkofer-Institute for Virology, Ludwig-Maximilians-University Munich, Pettenkoferstrasse 9a, 80336 Munich, Germany. adler_b@mvp.uni-muenchen.de.

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Summary
This summary is machine-generated.

Herpesvirus glycoproteins gH/gL control viral entry and tropism. A new study reveals the human cytomegalovirus (HCMV) protein UL148 regulates gH/gL complex incorporation into virions, influencing HCMV host cell targeting.

Keywords:
UL148gH/gL glycoprotein complexeshuman cytomegalovirusvirus navigation

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Herpesvirus gH/gL complexes mediate viral entry and cell tropism.
  • Alternative gH/gL complexes in Epstein-Barr virus (EBV) and human cytomegalovirus (HCMV) influence host cell preference.
  • Viral envelope composition dictates tropism, with host cells modulating gH/gL complex expression.

Purpose of the Study:

  • To investigate the mechanism by which HCMV regulates its gH/gL complex complement.
  • To identify viral factors controlling the integration of specific gH/gL complexes into progeny virions.
  • To understand how HCMV modulates its tropism through gH/gL complex regulation.

Main Methods:

  • Analysis of HCMV virion envelope composition.
  • Identification and characterization of viral proteins involved in gH/gL complex assembly.
  • Functional assays to assess the impact of viral proteins on virion tropism.

Main Results:

  • HCMV expresses alternative multimeric gH/gL complexes that determine host cell tropism.
  • The ER-resident protein UL148 was identified as a key regulator of gH/gL complex integration into HCMV virions.
  • UL148 controls the formation of a specific virion pool, enabling differential routing by host cells.

Conclusions:

  • HCMV UL148 is the first identified protein that mechanistically regulates the gH/gL complex complement of progeny virions.
  • UL148 acts as a critical determinant of HCMV tropism by controlling gH/gL complex incorporation.
  • This finding provides a mechanistic insight into HCMV navigation within infected hosts.