Spatiotemporal dynamics of HSV genome nuclear entry and compaction state transitions using bioorthogonal chemistry and super-resolution microscopy
File(s)journal.ppat.1006721.pdf (17.29 MB)
Accepted version
Author(s)
Sekine, E
Schmidt, N
Gaboriau, D
O'Hare, P
Type
Journal Article
Abstract
We investigated the spatiotemporal dynamics of HSV genome transport during the initiation of infection using viruses containing bioorthogonal traceable precursors incorporated into their genomes (HSVEdC). In vitro assays revealed a structural alteration in the capsid induced upon HSVEdC binding to solid supports that allowed coupling to external capture agents and demonstrated that the vast majority of individual virions contained bioorthogonally-tagged genomes. Using HSVEdC in vivo we reveal novel aspects of the kinetics, localisation, mechanistic entry requirements and morphological transitions of infecting genomes. Uncoating and nuclear import was observed within 30 min, with genomes in a defined compaction state (ca. 3-fold volume increase from capsids). Free cytosolic uncoated genomes were infrequent (7-10% of the total uncoated genomes), likely a consequence of subpopulations of cells receiving high particle numbers. Uncoated nuclear genomes underwent temporal transitions in condensation state and while ICP4 efficiently associated with condensed foci of initial infecting genomes, this relationship switched away from residual longer lived condensed foci to increasingly decondensed genomes as infection progressed. Inhibition of transcription had no effect on nuclear entry but in the absence of transcription, genomes persisted as tightly condensed foci. Ongoing transcription, in the absence of protein synthesis, revealed a distinct spatial clustering of genomes, which we have termed genome congregation, not seen with non-transcribing genomes. Genomes expanded to more decondensed forms in the absence of DNA replication indicating additional transitional steps. During full progression of infection, genomes decondensed further, with a diffuse low intensity signal dissipated within replication compartments, but frequently with tight foci remaining peripherally, representing unreplicated genomes or condensed parental strands of replicated DNA. Uncoating and nuclear entry was independent of proteasome function and resistant to inhibitors of nuclear export. Together with additional data our results reveal new insight into the spatiotemporal dynamics of HSV genome uncoating, transport and organisation.
Date Issued
2017-11-09
Date Acceptance
2017-10-30
Citation
PLoS Pathogens, 2017, 13 (11), pp.1-36
ISSN
1553-7366
Publisher
Public Library of Science (PLoS)
Start Page
1
End Page
36
Journal / Book Title
PLoS Pathogens
Volume
13
Issue
11
Copyright Statement
© 2017 Sekine et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
License URL
Sponsor
Wellcome Trust
Biotechnology and Biological Sciences Research Council (BBSRC)
Identifier
PII: PPATHOGENS-D-17-01897
Grant Number
105395/Z/14/Z
BB/L015129/1
Subjects
Science & Technology
Life Sciences & Biomedicine
Microbiology
Parasitology
Virology
HERPES-SIMPLEX-VIRUS
HOST-CELL ENTRY
LYTIC INFECTION
DNA-REPLICATION
TYPE-1 DNA
PORE COMPLEX
VIRAL-DNA
STRUCTURED ILLUMINATION
UNSTABLE NUCLEOSOMES
MICROCOCCAL NUCLEASE
Capsid Proteins
Cell Line
Cell Nucleus
DNA Replication
Genome, Viral
Herpesvirus 1, Human
Humans
Microscopy
Virion
Virus Replication
Virus Uncoating
Cell Line
Cell Nucleus
Humans
Herpesvirus 1, Human
Virion
Capsid Proteins
Microscopy
Virus Replication
DNA Replication
Genome, Viral
Virus Uncoating
Virology
0605 Microbiology
1107 Immunology
1108 Medical Microbiology
Publication Status
Published
Article Number
e1006721
Date Publish Online
2017-11-09