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Mutagenesis of Human Cytomegalovirus Glycoprotein L Disproportionately Disrupts gH/gL/gO over gH/gL/pUL128-131

Journal Article · · Journal of Virology
DOI:https://doi.org/10.1128/jvi.00612-21· OSTI ID:1922084
Herein, cell-free and cell-to-cell spread of herpesviruses involves a core fusion apparatus comprised of the fusion protein glycoprotein B (gB) and the regulatory factor gH/gL. The human cytomegalovirus (HCMV) gH/gL/gO and gH/gL/pUL128-131 facilitate spread in different cell types. The gO and pUL128-131 components bind distinct receptors, but how the gH/gL portions of the complexes functionally compare is not understood. We previously characterized a panel of gL mutants by transient expression and showed that many were impaired for gH/gL-gB-dependent cell-cell fusion but were still able to form gH/gL/pUL128-131 and induce receptor interference. Here, the gL mutants were engineered into the HCMV BAC clones TB40/e-BAC4 (TB), TR, and Merlin (ME), which differ in their utilization of the two complexes for entry and spread. Several of the gL mutations disproportionately impacted gH/gL/gO-dependent entry and spread over gH/gL/pUL128-131 processes. The effects of some mutants could be explained by impaired gH/gL/gO assembly, but other mutants impacted gH/gL/gO function. Soluble gH/gL/gO containing the L201 mutant failed to block HCMV infection despite unimpaired binding to PDGFRα, indicating the existence of other important gH/gL/gO receptors. Another mutant (L139) enhanced the gH/gL/gO-dependent cell-free spread of TR, suggesting a “hyperactive” gH/gL/gO. Recently published crystallography and cryo-electron microscopy studies suggest structural conservation of the gH/gL underlying gH/gL/gO and gH/gL/pUL128-131. However, our data suggest important differences in the gH/gL of the two complexes and support a model in which gH/gL/gO can provide an activation signal for gB.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH); e German Research Foundation (DFG)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1922084
Report Number(s):
PNNL-SA-166126
Journal Information:
Journal of Virology, Journal Name: Journal of Virology Journal Issue: 17 Vol. 95; ISSN 0022-538X
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

References (67)

Role of envelope glycoprotein complexes in cell-associated spread of human cytomegalovirus other January 2021
UCSF Chimera?A visualization system for exploratory research and analysis journal January 2004
Recognition of compartmentalized intracellular analogs of glycoprotein H of human cytomegalovirus journal March 1992
Human cytomegalovirus: taking the strain journal April 2015
An Unbiased Screen for Human Cytomegalovirus Identifies Neuropilin-2 as a Central Viral Receptor journal August 2018
Structures of HCMV Trimer reveal the basis for receptor recognition and cell entry journal March 2021
Platelet-derived growth factor-α receptor activation is required for human cytomegalovirus infection journal August 2008
Platelet-derived growth factor-α receptor is the cellular receptor for human cytomegalovirus gHgLgO trimer journal June 2016
The structural basis of herpesvirus entry journal October 2020
Human cytomegalovirus virion protein complex required for epithelial and endothelial cell tropism journal November 2005
Mechanism for neutralizing activity by the anti-CMV gH/gL monoclonal antibody MSL-109 journal May 2014
A viral regulator of glycoprotein complexes contributes to human cytomegalovirus cell tropism journal March 2015
Structural and biochemical studies of HCMV gH/gL/gO and Pentamer reveal mutually exclusive cell entry complexes journal January 2015
The pentameric complex drives immunologically covert cell–cell transmission of wild-type human cytomegalovirus journal May 2017
Role of PDGF receptor-α during human cytomegalovirus entry into fibroblasts journal October 2018
OR14I1 is a receptor for the human cytomegalovirus pentameric complex and defines viral epithelial cell tropism journal March 2019
Human cytomegalovirus haplotype reconstruction reveals high diversity due to superinfection and evidence of within-host recombination journal February 2019
Coding potential of laboratory and clinical strains of human cytomegalovirus journal December 2003
Characterization of Human Cytomegalovirus Genome Diversity in Immunocompromised Hosts by Whole-Genome Sequencing Directly From Clinical Specimens journal March 2017
Human Cytomegalovirus Genomes Sequenced Directly From Clinical Material: Variation, Multiple-Strain Infection, Recombination, and Gene Loss journal May 2019
Multiple-Strain Infections of Human Cytomegalovirus With High Genomic Diversity Are Common in Breast Milk From Human Immunodeficiency Virus–Infected Women in Zambia journal May 2019
Islands of linkage in an ocean of pervasive recombination reveals two-speed evolution of human cytomegalovirus genomes journal January 2016
Modification of human cytomegalovirus tropism through propagation in vitro is associated with changes in the viral genome journal November 1999
The contribution of pUL74 to growth of human cytomegalovirus is masked in the presence of RL13 and UL128 expression journal August 2016
Sequential mutations associated with adaptation of human cytomegalovirus to growth in cell culture journal May 2010
Dendritic-cell infection by human cytomegalovirus is restricted to strains carrying functional UL131-128 genes and mediates efficient viral antigen presentation to CD8+ T cells journal February 2005
Role of human cytomegalovirus UL131A in cell type-specific virus entry and release journal September 2006
Cloning and sequencing of a highly productive, endotheliotropic virus strain derived from human cytomegalovirus TB40/E journal February 2008
The Rag GTPases Bind Raptor and Mediate Amino Acid Signaling to mTORC1 journal June 2008
Structural basis for potent antibody-mediated neutralization of human cytomegalovirus journal June 2017
Specialization for Cell-Free or Cell-to-Cell Spread of BAC-Cloned Human Cytomegalovirus Strains Is Determined by Factors beyond the UL128-131 and RL13 Loci journal June 2020
Influence of Human Cytomegalovirus Glycoprotein O Polymorphism on the Inhibitory Effect of Soluble Forms of Trimer- and Pentamer-Specific Entry Receptors journal July 2020
Loss of the Human Cytomegalovirus US16 Protein Abrogates Virus Entry into Endothelial and Epithelial Cells by Reducing the Virion Content of the Pentamer journal June 2017
High-Throughput Analysis of Human Cytomegalovirus Genome Diversity Highlights the Widespread Occurrence of Gene-Disrupting Mutations and Pervasive Recombination journal August 2015
Neonatal Neural Progenitor Cells and Their Neuronal and Glial Cell Derivatives Are Fully Permissive for Human Cytomegalovirus Infection journal October 2008
Comparative Analysis of gO Isoforms Reveals that Strains of Human Cytomegalovirus Differ in the Ratio of gH/gL/gO and gH/gL/UL128-131 in the Virion Envelope journal September 2013
Human Cytomegalovirus Glycoprotein B Is Required for Virus Entry and Cell-to-Cell Spread but Not for Virion Attachment, Assembly, or Egress journal April 2009
Human Cytomegalovirus gH/gL/gO Promotes the Fusion Step of Entry into All Cell Types, whereas gH/gL/UL128-131 Broadens Virus Tropism through a Distinct Mechanism journal September 2015
The Human Cytomegalovirus Trimer and Pentamer Promote Sequential Steps in Entry into Epithelial and Endothelial Cells at Cell Surfaces and Endosomes journal November 2018
Importance of Highly Conserved Peptide Sites of Human Cytomegalovirus gO for Formation of the gH/gL/gO Complex journal January 2017
UL74 of Human Cytomegalovirus Contributes to Virus Release by Promoting Secondary Envelopment of Virions journal March 2008
Human Cytomegalovirus Glycoproteins gB and gH/gL Mediate Epithelial Cell-Cell Fusion When Expressed either in cis or in trans journal December 2008
Scanning Mutagenesis of Human Cytomegalovirus Glycoprotein gH/gL journal March 2016
Characterization of the Human Cytomegalovirus gH/gL/UL128-131 Complex That Mediates Entry into Epithelial and Endothelial Cells journal January 2008
Polymorphisms in Human Cytomegalovirus Glycoprotein O (gO) Exert Epistatic Influences on Cell-Free and Cell-to-Cell Spread and Antibody Neutralization on gH Epitopes journal March 2020
A Human Cytomegalovirus gO-Null Mutant Fails To Incorporate gH/gL into the Virion Envelope and Is Unable To Enter Fibroblasts and Epithelial and Endothelial Cells journal March 2010
The Human Cytomegalovirus UL116 Gene Encodes an Envelope Glycoprotein Forming a Complex with gH Independently from gL journal May 2016
Genetic Stability of Bacterial Artificial Chromosome-Derived Human Cytomegalovirus during Culture In Vitro journal April 2016
A Third-Generation Lentivirus Vector with a Conditional Packaging System journal November 1998
Human Cytomegalovirus UL131-128 Genes Are Indispensable for Virus Growth in Endothelial Cells and Virus Transfer to Leukocytes journal August 2004
Human Cytomegalovirus UL131 Open Reading Frame Is Required for Epithelial Cell Tropism journal August 2005
Human Cytomegalovirus Entry into Epithelial and Endothelial Cells Depends on Genes UL128 to UL150 and Occurs by Endocytosis and Low-pH Fusion journal January 2006
Identification of the major capsid protein gene of human cytomegalovirus journal March 1989
Reconstruction of the complete human cytomegalovirus genome in a BAC reveals RL13 to be a potent inhibitor of replication journal September 2010
Rapid Intrahost Evolution of Human Cytomegalovirus Is Shaped by Demography and Positive Selection journal September 2013
HCMV Spread and Cell Tropism are Determined by Distinct Virus Populations journal January 2011
Extensive Genome-Wide Variability of Human Cytomegalovirus in Congenitally Infected Infants journal May 2011
PDGF Receptor-α Does Not Promote HCMV Entry into Epithelial and Endothelial Cells but Increased Quantities Stimulate Entry by an Abnormal Pathway journal September 2012
The HCMV gH/gL/UL128-131 Complex Triggers the Specific Cellular Activation Required for Efficient Viral Internalization into Target Monocytes journal July 2013
Human Cytomegalovirus gH/gL Forms a Stable Complex with the Fusion Protein gB in Virions journal April 2016
A derivative of platelet-derived growth factor receptor alpha binds to the trimer of human cytomegalovirus and inhibits entry into fibroblasts and endothelial cells journal April 2017
Human cytomegalovirus glycoprotein complex gH/gL/gO uses PDGFR-α as a key for entry journal April 2017
Past and ongoing adaptation of human cytomegalovirus to its host journal May 2020
Targeted mutagenesis on PDGFRα-Fc identifies amino acid modifications that allow efficient inhibition of HCMV infection while abolishing PDGF sequestration journal March 2021
Differences in Growth Properties among Two Human Cytomegalovirus Glycoprotein O Genotypes journal August 2017
Cytomegalovirus Strain TB40/E Restrictions and Adaptations to Growth in ARPE-19 Epithelial Cells journal April 2020
Role of Envelope Glycoprotein Complexes in Cell-Associated Spread of Human Cytomegalovirus journal April 2021

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