Cited by 130T-cell and Retrovirus StudiesRNA Research and SplicingHIV Research and Treatment

Mouse mammary tumor virus encodes a self-regulatory RNA export protein and is a complex retrovirus

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Mertz, Jennifer A., Simper, Melissa S., Lozano, Mary M., Payne, Shelley M., Dudley, Jaquelin P.·2005·Journal of Virology

Abstract

Mouse mammary tumor virus (MMTV) has been classified as a simple retrovirus with two accessory genes,dut and sag. Cloned MMTV proviruses carrying a trimethoprim (trim) cassette in the envelope gene were defective for Gag protein production and the nuclear export of unspliced gag-pol RNA. Complementation experiments indicated that a trans-acting product was responsible for the Gag defect of such mutants. Analysis of MMTV-infected cells revealed the presence of a novel, doubly spliced RNA that encodes a putative product of 301 amino acids. Overexpression of cDNA from this RNA increased Gag levels from env mutant proviruses or reporter gene expression from unspliced mRNAs and allowed detection of a 33-kDa protein product, which has been named r egulator of e xport of MMTV m RNA, or Rem. The Rem N terminus has motifs similar to the Rev-like export proteins of complex retroviruses, and mutation of the nuclear localization signal (NLS) abolished RNA export and detection within the nucleus. The Rem C terminus has few identifiable features, but removal of this domain increased Rem-mediated export, suggesting an autoregulatory function. A reporter vector developed from the 3′ end of the MMTV provirus was Rem responsive and required both the presence of the MMTV env-U3 junction and a functional Crm1 pathway. The identification of a third accessory protein from a doubly spliced transcript suggests that MMTV is the first murine complex retrovirus to be documented. Manipulation of the MMTV genome may provide mouse models for human retroviral diseases, such as AIDS.

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Crossref · 10.1128/jvi.79.23.14737-14747.2005

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Authors
Mertz, J. A., Simper, M. S., Lozano, M. M., Payne, S. M., & Dudley, J. P.
Affiliations
The University of Texas at Austin (US)
Corresponding author
Dudley, Jaquelin P.
Venue
Journal of Virology
Published
2005-12-15
Volume
79
Issue
23
Pages
14737-14747
ISSN
  • 0022-538X (ISSN-L)
  • 1098-5514
OpenAlex
W2109377528
Cited by
130
References
58
Citations by year
2026: 3 · 2025: 6 · 2024: 2 · 2023: 3 · 2022: 8 · 2021: 3 · 2020: 7 · 2019: 7 · 2018: 6 · 2017: 4 · 2016: 4 · 2015: 12 · 2014: 6 · 2013: 6 · 2012: 8
FWCI
1.90
Type
journal article
Language
en
Open access
Locations
  • Journal of Virology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and Retrovirus Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Immunology and Microbiology › Virology › HIV Research and Treatment
Keywords
mouse mammary tumor virus, RNA export, nuclear export, Gag protein, accessory genes, nuclear localization signal, murine retrovirus
MeSH terms
Animals, Mammary Tumor Virus, Mouse, RNA, Viral, Viral Proteins, Mice

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