RT Journal Article SR Electronic(1) A1 Park, Eunhye A1 Griffin, Diane E.YR 2009 T1 Interaction of Sindbis virus non-structural protein 3 with poly(ADP-ribose) polymerase 1 in neuronal cells JF Journal of General Virology, VO 90 IS 9 SP 2073 OP 2080 DO https://doi.org/10.1099/vir.0.012682-0 PB Microbiology Society, SN 1465-2099, AB The alphavirus non-structural protein 3 (nsP3) has a conserved N-terminal macro domain and a variable highly phosphorylated C-terminal domain. nsP3 forms complexes with cellular proteins, but its role in virus replication is poorly understood and protein interaction domains have not been defined. As the N-terminal macro domain can bind poly(ADP-ribose) (PAR), and PAR polymerase-1 (PARP-1) is activated and autoribosylated during Sindbis virus (SINV) infection, it was hypothesized that PARP-1 and nsP3 may interact. Co-immunoprecipitation studies showed that PARP-1 interacted with nsP3 during SINV infection of NSC34 neuronal cells and was most abundantly present in replication complexes that contained plus- and minus-strand SINV RNAs 10–14 h after infection, prior to PARP-1 activation or automodification with PAR. Treatment with an inhibitor of PARP enzymic activity did not affect the interaction between nsP3 and PARP-1 or SINV replication. Co-expression of individual domains of nsP3 with PARP-1 showed that nsP3 interacted with PARP-1 through the C-terminal domain, not the N-terminal macro domain, and that phosphorylation was not required. It was concluded that PARP-1 interacts with the C-terminal domain of nsP3, is present in replication complexes during virus amplification and may play a role in regulating virus RNA synthesis in neuronal cells., UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/vir.0.012682-0