Cited by 9RNA Research and SplicingProtein Structure and DynamicsHIV Research and Treatment

The Rous sarcoma virus Gag Polyprotein Forms Biomolecular Condensates Driven by Intrinsically-disordered Regions

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Kaddis Maldonado, Rebecca, Lambert, Gregory S., Rice, Breanna L., Sudol, Malgorzata, Flanagan, John M., Parent, Leslie J.·2023·Journal of Molecular Biology

Published version of a preprint

Abstract

Biomolecular condensates (BMCs) play important roles incellular structures includingtranscription factories, splicing speckles, and nucleoli. BMCs bring together proteins and other macromolecules, selectively concentrating them so that specific reactions can occur without interference from the surrounding environment. BMCs are often made up of proteins that contain intrinsically disordered regions (IDRs), form phase-separated spherical puncta, form liquid-like droplets that undergo fusion and fission, contain molecules that are mobile, and are disrupted with phase-dissolving drugs such as 1,6-hexanediol. In addition to cellular proteins, many viruses, including influenza A, SARS-CoV-2, and human immunodeficiency virus type 1 (HIV-1) encode proteins that undergo phase separation and rely on BMC formation for replication. In prior studies of the retrovirus Rous sarcoma virus (RSV), we observed that the Gag protein forms discrete spherical puncta in the nucleus, cytoplasm, and at the plasma membrane that co-localize with viral RNA and host factors, raising the possibility that RSV Gag forms BMCs that participate in the intracellular phase of the virion assembly pathway. In our current studies, we found that Gag contains IDRs in the N-terminal (MAp2p10) and C-terminal (NC) regions of the protein and fulfills many criteria of BMCs. Although the role of BMC formation in RSV assembly requires further study, our results suggest the biophysical properties of condensates are required for the formation of Gag complexes in the nucleus and the cohesion of these complexes as they traffic through the nuclear pore, into the cytoplasm, and to the plasma membrane, where the final assembly and release of virus particles occurs.

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Authors
Kaddis Maldonado, R., Lambert, G. S., Rice, B. L., Sudol, M., Flanagan, J. M., & Parent, L. J.
Affiliations
Pennsylvania State University (US)
Corresponding author
Parent, Leslie J.
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2023-08
Volume
435
Issue
16
Pages
168182
ISSN
0022-2836 (ISSN-L)
OpenAlex
W4380677618
Cited by
9
References
141
Citations by year
2026: 1 · 2025: 3 · 2024: 4 · 2023: 1
FWCI
0.80
Type
journal article
Language
en
Open access
Locations
  • Journal of Molecular Biology (acceptedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • PubMed Central (submittedVersion)
Funders
  • Penn State College of Medicine (JF646, JF549)
  • Pennsylvania Department of Health
  • National Institutes of Health (R01GM139392, SCR_022526)
  • University of Dundee
  • University of Colorado Boulder
  • McGill University
  • National Institute of General Medical Sciences
  • University of Toronto
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Immunology and Microbiology › Virology › HIV Research and Treatment
Keywords
Rous sarcoma virus, Gag protein, biomolecular condensates, intrinsically disordered regions, phase separation, retroviral assembly, viral RNA, droplets, 1,6-hexanediol, viral assembly

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