RNA is a Structural Element in Retrovirus Particles

A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle, this RNA species is unnecessary for particle assembly in vivo. In vitro, nucleic acids profoundly enhance the efficiency of assembly by recom...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 98; no. 9; pp. 5246 - 5251
Main Authors Muriaux, Delphine, Mirro, Jane, Harvin, Demetria, Rein, Alan
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 24.04.2001
National Acad Sciences
The National Academy of Sciences
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Abstract A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle, this RNA species is unnecessary for particle assembly in vivo. In vitro, nucleic acids profoundly enhance the efficiency of assembly by recombinant Gag proteins, apparently by acting as "scaffolding" in the particle. To address the participation of RNA in retrovirus assembly in vivo, we analyzed murine leukemia virus particles that lack genomic RNA because of a deletion in the packaging signal of the viral RNA. We found that these particles contain cellular mRNA in place of genomic RNA. This result was particularly evident when Gag was expressed by using a Semliki Forest virus-derived vector: under these conditions, the Semliki Forest virus vector-directed mRNA became very abundant in the cells and was readily identified in the retroviral virus-like particles. Furthermore, we found that the retroviral cores were disrupted by treatment with RNase. Taken together, the data strongly suggest that RNA is a structural element in retrovirus particles.
AbstractList A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle, this RNA species is unnecessary for particle assembly in vivo. In vitro, nucleic acids profoundly enhance the efficiency of assembly by recombinant Gag proteins, apparently by acting as "scaffolding" in the particle. To address the participation of RNA in retrovirus assembly in vivo, we analyzed murine leukemia virus particles that lack genomic RNA because of a deletion in the packaging signal of the viral RNA. We found that these particles contain cellular mRNA in place of genomic RNA. This result was particularly evident when Gag was expressed by using a Semliki Forest virus-derived vector: under these conditions, the Semliki Forest virus vector-directed mRNA became very abundant in the cells and was readily identified in the retroviral virus-like particles. Furthermore, we found that the retroviral cores were disrupted by treatment with RNase. Taken together, the data strongly suggest that RNA is a structural element in retrovirus particles.
A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle, this RNA species is unnecessary for particle assembly in vivo . In vitro , nucleic acids profoundly enhance the efficiency of assembly by recombinant Gag proteins, apparently by acting as “scaffolding” in the particle. To address the participation of RNA in retrovirus assembly in vivo , we analyzed murine leukemia virus particles that lack genomic RNA because of a deletion in the packaging signal of the viral RNA. We found that these particles contain cellular mRNA in place of genomic RNA. This result was particularly evident when Gag was expressed by using a Semliki Forest virus-derived vector: under these conditions, the Semliki Forest virus vector-directed mRNA became very abundant in the cells and was readily identified in the retroviral virus-like particles. Furthermore, we found that the retroviral cores were disrupted by treatment with RNase. Taken together, the data strongly suggest that RNA is a structural element in retrovirus particles.
A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle, this RNA species is unnecessary for particle assembly in vivo . In vitro , nucleic acids profoundly enhance the efficiency of assembly by recombinant Gag proteins, apparently by acting as “scaffolding” in the particle. To address the participation of RNA in retrovirus assembly in vivo , we analyzed murine leukemia virus particles that lack genomic RNA because of a deletion in the packaging signal of the viral RNA. We found that these particles contain cellular mRNA in place of genomic RNA. This result was particularly evident when Gag was expressed by using a Semliki Forest virus-derived vector: under these conditions, the Semliki Forest virus vector-directed mRNA became very abundant in the cells and was readily identified in the retroviral virus-like particles. Furthermore, we found that the retroviral cores were disrupted by treatment with RNase. Taken together, the data strongly suggest that RNA is a structural element in retrovirus particles. murine leukemia virus packaging cell lines retrovirus assembly RNA packaging Semliki Forest virus gene expression system
A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle, this RNA species is unnecessary for particle assembly in vivo.
Author Harvin, Demetria
Mirro, Jane
Rein, Alan
Muriaux, Delphine
AuthorAffiliation HIV Drug Resistance Program, National Cancer Institute–Frederick Cancer Research and Development Center, Frederick, MD 21702-1201
AuthorAffiliation_xml – name: HIV Drug Resistance Program, National Cancer Institute–Frederick Cancer Research and Development Center, Frederick, MD 21702-1201
Author_xml – sequence: 1
  givenname: Delphine
  surname: Muriaux
  fullname: Muriaux, Delphine
– sequence: 2
  givenname: Jane
  surname: Mirro
  fullname: Mirro, Jane
– sequence: 3
  givenname: Demetria
  surname: Harvin
  fullname: Harvin, Demetria
– sequence: 4
  givenname: Alan
  surname: Rein
  fullname: Rein, Alan
BackLink https://www.ncbi.nlm.nih.gov/pubmed/11320254$$D View this record in MEDLINE/PubMed
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To whom reprint requests should be addressed at: HIV Drug Resistance Program, National Cancer Institute–Frederick Cancer Research and Development Center, P.O. Box B, Frederick, MD 21702-1201. E-mail: rein@ncifcrf.gov.
Edited by John M. Coffin, Tufts University School of Medicine, Boston, MA, and approved February 23, 2001
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Snippet A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle,...
A single retroviral protein, Gag, is sufficient for virus particle assembly. While Gag is capable of specifically packaging the genomic RNA into the particle,...
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SubjectTerms Animals
Biological Sciences
Cell Line
Cricetinae
Gag protein
Gene Products, gag - genetics
Gene Products, gag - metabolism
Genetic Vectors - genetics
Genome, Viral
Genomics
Humans
Leukemia Virus, Murine - chemistry
Leukemia Virus, Murine - genetics
Leukemia Virus, Murine - metabolism
Messenger RNA
Microbiology
Molecules
Murine leukemia virus
Packaging
Particle interactions
Retroviridae
Retrovirus
Reverse Transcriptase Polymerase Chain Reaction
ribonuclease
Ribonuclease, Pancreatic - metabolism
Ribonucleic acid
RNA
RNA, Messenger - analysis
RNA, Messenger - genetics
RNA, Messenger - metabolism
RNA, Viral - analysis
RNA, Viral - genetics
RNA, Viral - metabolism
Semliki Forest virus
Semliki forest virus - genetics
Sequence Deletion - genetics
Viral RNA
Virion - chemistry
Virion - genetics
Virion - metabolism
Virions
Virus Assembly
Viruses
Title RNA is a Structural Element in Retrovirus Particles
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