Retroviral restriction factors Fv1 and TRIM5alpha act independently and can compete for incoming virus before reverse transcription

The restriction factors Fv1 and TRIM5alpha provide dominant blocks to retroviral infection, targeting incoming capsids at a postentry, preintegration step. They both restrict N-tropic murine leukemia virus with similar specificity yet act at different points in the viral life cycle. TRIM5alpha-restr...

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Bibliographic Details
Published in:Journal of virology 2006-03, Vol.80 (5), p.2100
Main Authors: Passerini, Luca D, Keckesova, Zuzana, Towers, Greg J
Format: Article
Language:English
Subjects:
Antiviral Restriction Factors
Carrier Proteins - genetics
Carrier Proteins - physiology
Cell Line
DNA, Viral - biosynthesis
Flow Cytometry
Genes, Reporter
Genetic Vectors
Green Fluorescent Proteins - analysis
Green Fluorescent Proteins - genetics
Humans
Leukemia Virus, Murine - growth & development
Proteins - genetics
Proteins - physiology
Reverse Transcription
Tripartite Motif Proteins
Ubiquitin-Protein Ligases
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Summary:The restriction factors Fv1 and TRIM5alpha provide dominant blocks to retroviral infection, targeting incoming capsids at a postentry, preintegration step. They both restrict N-tropic murine leukemia virus with similar specificity yet act at different points in the viral life cycle. TRIM5alpha-restricted virus is usually unable to reverse transcribe, whereas Fv1-restricted virus reverse transcribes normally. Here we investigate the relationship between these two restriction factors by expressing Fv1 alleles in human cells. We demonstrate that Fv1 is able to compete with TRIM5alpha for virus before reverse transcription. In human cells expressing Fv1(b), N-tropic restricted virus becomes less infectious but reverse transcribes more efficiently, indicating competition between the two antiviral molecules and protection of the virus from TRIM5alpha by Fv1. Our findings suggest that, like TRIM5alpha, Fv1 interacts with virus before reverse transcription, but the consequences of this interaction are not realized until a later stage of the life cycle. We also demonstrate that Fv1 is functionally independent of TRIM5alpha when expressed in human cells.
ISSN:0022-538X
DOI:10.1128/JVI.80.5.2100-2105.2006