The Rous sarcoma virus Gag Polyprotein Forms Biomolecular Condensates Driven by Intrinsically-disordered Regions
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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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Detailed Mapping of the Nuclear Export Signal in the Rous Sarcoma Virus Gag Protein
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Gel or Die: Phase Separation as a Survival Strategy
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Self-citationSolution Structure of the Rous Sarcoma Virus Nucleocapsid Protein: μΨ RNA Packaging Signal Complex
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Determination of Protein Phase Diagrams by Centrifugation
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Function and Regulation of Phase-Separated Biological Condensates
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On the origin of non-membrane-bound organelles, and their physiological function
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When liquid-liquid phase separation meets viral infections
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AN EXPERIMENTAL COMPARISON OF TRANSPLANTED TUMOR AND A TRANSPLANTED NORMAL TISSUE CAPABLE OF GROWTH
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NC-mediated nucleolar localization of retroviral gag proteins
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Self-citationIntermolecular Interactions between Retroviral Gag Proteins in the Nucleus
Kenney, S. P., Lochmann, T. L., Schmid, C. L., & Parent, L. (2007) · Journal of Virology · doi:10.1128/jvi.02049-07 · Cited by 40 · see citing works
Self-citationHost RNA Packaging by Retroviruses: A Newly Synthesized Story
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Structure and Function of Negri Bodies
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Membraneless organelles restructured and built by pandemic viruses: HIV-1 and SARS-CoV-2
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Nuclear Trafficking of Retroviral RNAs and Gag Proteins during Late Steps of Replication
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trans -Acting Inhibition of Genomic RNA Dimerization by Rous Sarcoma Virus Matrix Mutants
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Visualizing Association of the Retroviral Gag Protein with Unspliced Viral RNA in the Nucleus
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Self-citationThe Role of Protein Disorder in Nuclear Transport and in Its Subversion by Viruses
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Beyond Plasma Membrane Targeting: Role of the MA domain of Gag in Retroviral Genome Encapsidation
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Self-citationAnalyzing the Sequences of Intrinsically Disordered Regions with CIDER and localCIDER
Ginell, G. M., & Holehouse, A. S. (2020) · Methods in molecular biology · doi:10.1007/978-1-0716-0524-0_5 · Cited by 22 · see citing works
How Do Intrinsically Disordered Viral Proteins Hijack the Cell?
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Functional Equivalence of Retroviral MA Domains in Facilitating Psi RNA Binding Specificity by Gag
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Self-citationInterplay between the alpharetroviral Gag protein and SR proteins SF2 and SC35 in the nucleus
Rice, B. L., Maldonado, R. J. K., Stake, M. S., Lochmann, T. L., & Parent, L. J. (2015) · Frontiers in Microbiology · doi:10.3389/fmicb.2015.00925 · Cited by 11 · see citing works
Self-citationRice, B. L., Stake, M. S., & Parent, L. J. (2020) · Journal of Virology · doi:10.1128/jvi.00640-20 · Cited by 9 · see citing works
Self-citationAn Optogenetic Toolkit for the Control of Phase Separation in Living Cells
Kim, C., & Shin, Y. (2022) · Methods in molecular biology · doi:10.1007/978-1-0716-2663-4_19 · Cited by 4 · see citing works
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2 of the 141 references couldn’t be matched to a known paper.
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Biomolecular condensates with liquid properties formed during viral infections
Glon, D., Léonardon, B., Guillemot, A., Albertini, A., Lagaudrière‐Gesbert, C., & Gaudin, Y. (2024) · Microbes and Infection · doi:10.1016/j.micinf.2024.105402 · Cited by 14 · see citing works
Cagliani, R., Forni, D., Mozzi, A., Fuchs, R., Tussia-Cohen, D., Arrigoni, F., Pozzoli, U., GIOIA, L. D., Hagai, T., & Sironi, M. (2024) · Molecular Biology and Evolution · doi:10.1093/molbev/msae154 · Cited by 12 · see citing works
Virus Induced Membraneless Organelles and Biomolecular Condensates
Mouland, A. J., Parent, L. J., Weber, S. C., & Holehouse, A. S. (2023) · Journal of Molecular Biology · doi:10.1016/j.jmb.2023.168213 · Cited by 6 · see citing works
Self-citationComparative analysis of retroviral Gag-host cell interactions: focus on the nuclear interactome
Lambert, G. S., Rice, B. L., Maldonado, R. J. K., Chang, J., & Parent, L. J. (2024) · Retrovirology · doi:10.1186/s12977-024-00645-y · Cited by 5 · see citing works
Self-citationLambert, G. S., Maldonado, R. J. K., & Parent, L. J. (2025) · Viruses · doi:10.3390/v17010097 · Cited by 3 · see citing works
Self-citationRNA ‐centric world of retroviruses: unravelling the molecular strategies of genomic RNA packaging
Jehad, M. A., Prabhu, S., Ali, L. M., Pillai, V. N., Mustafa, F., & Rizvi, T. A. (2026) · Biological reviews/Biological reviews of the Cambridge Philosophical Society · doi:10.1002/brv.70188 · Cited by 2 · see citing works
Maldonado, R. J. K., & Parent, L. J. (2025) · mBio · doi:10.1128/mbio.01695-25 · Cited by 1 · see citing works
Self-citationMouland, A. J., Chau, B.-A., & Uversky, V. N. (2024) · Methods · doi:10.1016/j.ymeth.2024.07.002 · Cited by 1 · see citing works
Lambert, G. S., Siedlecki, C. A., & Parent, L. J. (2025) · International Journal of Molecular Sciences · doi:10.3390/ijms26125679 · Cited by 1 · see citing works
Self-citation
- 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)
- PMC
- PMC10527454
- 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
- bronze
- doi.org
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (am, 376 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- 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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