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An active foamy virus integrase is required for virus replication
The Journal of General Virology
|June 22, 1999
Summary
Foamy viruses (FVs) require a functional integrase (IN) for replication, similar to other retroviruses. However, their unique asymmetrical integration mechanism distinguishes them and may be common across the FV subfamily.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Foamy viruses (FVs) exhibit a unique replication strategy, sharing characteristics with both retroviruses and hepadnaviruses.
- Retroviruses are defined by the presence of integrase (IN) and obligate provirus integration, differentiating them from hepadnaviruses.
Purpose of the Study:
- To investigate the necessity of a functional integrase (IN) for foamy virus (FV) replication.
- To elucidate the mechanism of proviral DNA integration in FVs.
Main Methods:
- Analysis of an FV mutant with a modified active center integrase (IN) DD35E motif.
- Sequencing of foamy proviral DNA junctions with cellular DNA.
- Alignment of known FV genome sequences.
Main Results:
- The IN mutant expressed Gag and Pol precursors and generated cDNA but was replication-deficient.
- FV integration was found to be asymmetrical, involving specific cleavage at the U3 and U5 ends of the viral DNA.
- This asymmetrical integration mechanism appears to be a conserved feature within the FV subfamily.
Conclusions:
- Functional integrase (IN) is essential for foamy virus (FV) replication, aligning with other retroviruses.
- Foamy viruses (FVs) possess a unique and likely conserved mechanism for proviral DNA integration.