Key result
AAV2 Rep proteins antagonize the phosphatase PP1 to counteract KAP1-mediated epigenetic repression of the latent viral genome, enabling viral reactivation and replication.
The study identifies a novel viral mechanism where AAV2 Rep proteins antagonize PP1 to counteract KAP1-mediated epigenetic repression, providing insights into AAV latency that could inform future gene therapy vector design.
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AAV2 Rep-PP1 interference relieves KAP1 repression; leaves open targeted modulation for improved viral vector safety and efficacy.
ORF, leading to trimethylation of AAV2-associated histone 3 lysine 9 and that the inactivation of KAP1 repression is necessary for AAV2 reactivation and replication. We identify a viral mechanism for the counteraction of KAP1 in which interference with the KAP1 phosphatase protein phosphatase 1 (PP1) by the AAV2 Rep proteins mediates enhanced phosphorylation of KAP1-S824 and thus relief from KAP1 repression. Furthermore, we show that this phenomenon involves recruitment of the NIPP1 (nuclear inhibitor of PP1)-PP1α holoenzyme to KAP1 in a manner dependent upon the NIPP1 FHA domain, identifying NIPP1 as an interaction partner for KAP1 and shedding light on the mechanism through which PP1 regulates cellular KAP1 activity.
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Smith-Moore et al. (2018) studied Adeno-associated virus (AAV) latency. AAV2 Rep proteins vs. Control was evaluated on AAV2 replication and KAP1 phosphorylation. AAV2 Rep proteins antagonize the phosphatase PP1 to counteract KAP1-mediated epigenetic repression of the latent viral genome, enabling viral reactivation and replication.
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