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Muramatsu, S. et al.

Muramatsu, Handa, Kajigaya, Brown,

Transcription-positive cofactor 4 enhances rescue of adeno-associated virus genome from an infectious clone.

While Rep proteins are required for adeno-associated virus (AAV) replication, little is known about cellular proteins that interact with Rep. We demonstrate here that transcription-positive cofactor 4 ( PC4, p15) fused to Gal4- activating domain interacted with both AAV-2 and AAV-3 Rep proteins fused to Gal4 DNA-binding domain, leading to reporter activation in the yeast two-hybrid system. In addition to its coactivating function, PC4 recently has been shown to be involved in replication of simian virus 40. To study a functional role for the PC4- Rep protein interaction, 293-31 cells were cotransfected with a PC4 expression plasmid and an infectious clone of AAV-3, followed by super-infection with helper adenovirus. A significantly increased number of AAV-3 genomes were rescued in PC4 transfected cells. Our results support a possible involvement of PC4 in AAV replication and may be used in efficient production of AAV vectors for gene therapy.[1]

References

Transcription-positive cofactor 4 enhances rescue of adeno-associated virus genome from an infectious clone. Muramatsu, S., Handa, A., Kajigaya, S., Brown, K.E. J. Gen. Virol. (1998) [Pubmed]

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