Data from: Primary envelopment of Kaposi’s sarcoma-associated herpesvirus at the nucleoplasmic reticulum
Data files
Sep 26, 2025 version files 656.78 MB
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README.md
1.84 KB
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Supp_figure_final.pdf
656.78 MB
Abstract
Herpesvirus egress begins with primary envelopment of newly assembled capsids at the inner nuclear membrane (INM). Primary envelopment has been observed at the peripheral INM as well as nuclear infoldings. Nuclear infoldings from invaginations of the INM are Type-I nucleoplasmic reticulum (NR), whereas infoldings of both INM and outer nuclear membrane (ONM) are Type-II NR. Here, we report that Kaposi’s sarcoma-associated herpesvirus (KSHV) reactivation from latency and lytic cycle progression correlates with increases in both types of NR, but primary envelopment is restricted to peripheral INM and Type-I NR. These Type-I NR structures co-localized with puncta containing CTP:phosphocholine cytidylyltransferase (CCTα), the enzyme that catalyzes the rate-limiting step in phosphatidylcholine (PtdCho) synthesis that drives the de novo membrane biogenesis and membrane curvature required for NR expansion; CCTα recruitment may provide sufficient Type-I NR to facilitate nuclear egress. Despite the concurrent expansion of Type-II NR, primary envelopment involves a mechanism that specifically targets capsids to Type-I NR. Building upon our observation of capsids lacking envelopes in complex higher-order Type-I NR structures, we used polar lipid dyes, CLICK-labeled fluorescent viral genomes, and fluorescent KSHV capsids to track the fate of NR-associated capsids via live cell microscopy. These studies provide evidence for trafficking of NR-associated capsids toward the nuclear periphery and cytoplasm. Taken together, these findings suggest that nuclear egress occurs not only at the nuclear periphery but also at the Type-I NR.
Journal of Virology, 2025
Supplementary material for the manuscript has been uploaded as a single file, consisting of dozens of TEM images used to support the datasets shown in the main text of the manuscript.
Dataset DOI: 10.5061/dryad.qbzkh18v9
File name: Supp_figure_final.pdf
Description of the data and file structure
Figure S1. Additional images of nuclear infold events. Images correspond to experiments shown in Figs. 3, 4, 5, 6, 8 and 9A. Doxycycline-inducible iSLK-BAC16 cells were reactivated with 1 mg/mL doxycycline and 1 mM sodium butyrate and harvested 24h, 48h, 72h, 96h or 120h post-reactivation and processed for transmission electron microscopy. (A) Nuclear infolds are indicated by white arrows. In 48h samples, three images show the same cell at different magnifications. A yellow box matches the higher magnification image provided in figure (A of the main text, and pink and green boxes highlight the higher magnification images outlined in green and pink elsewhere in the supp. figure. White arrows point to Type-I NR events. Convoluted membrane events are grouped and labeled as such on the right-hand side. (B) iSLK cells as described in (A) demonstrate Type-II NR accumulate over the course of lytic replication. Green arrows indicate Type-I NR and blue arrows indicate the Type-II NR.
Files and variables
A single .pdf file is attached, with (A) and (B) on separate pages.
Code/software
Mac users can open the file in preview. Any generic software used to view a .pdf file should be suitable.
Access information
Other publicly accessible locations of the data:
- Journal of Virology, 2025.
Data was derived from the following sources:
- N/A
