AI Article Synopsis
- The VP1 protein of parvoviruses has a unique region that is proposed to contain a phospholipase A2 (pvPLA2) motif, which is shown to have PLA2 activity in the adeno-associated virus type 2 (AAV-2).
- Mutations in this region significantly lower the infectivity of the virus without affecting capsid assembly or entry into host cells.
- The reduced infectivity correlates with a delay and decrease in early gene expression, indicating that pvPLA2 activity is necessary for processes that occur after the virions accumulate near the cell nucleus but before early gene expression begins.
Article Abstract
The unique region of the VP1 protein of parvoviruses was proposed to contain a parvoviral phospholipase A2 (pvPLA2) motif. Here, PLA2 activity is shown in the unique region of adeno-associated virus type 2 (AAV-2) VP1 when expressed as an isolated domain in bacteria. Mutations in this region of the capsid protein strongly reduced the infectivity of mutant virions in comparison to wild-type AAV-2. This correlated with effects on the activity of PLA2. The mutations had no influence on capsid assembly, packaging of viral genomes into particles or binding to and entry into HeLa cells. However, a delayed onset and reduced amount of early gene expression, as measured by Rep immunofluorescence, was observed. These results suggest that pvPLA2 activity is required for a step following perinuclear accumulation of virions but prior to early gene expression.
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| http://dx.doi.org/10.1099/0022-1317-83-5-973 | DOI Listing |
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