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- W2098889173 abstract "Polyomavirus BK (BKV) is a serious problem for immunocompromised patients, where latent virus can enter into the lytic cycle causing cytolytic destruction of host cells. BKV infects >80 % of the population worldwide during childhood and then remains in a latent state in the kidney. In the context of immunosuppression in kidney transplant patients, reactivation of the viral early promoter (BKV E ) results in production of T antigen, enabling virus replication and transition from latency to the lytic phase, causing polyomavirus-associated nephropathy. Reactivation of BKV can also cause complications such as nephritis, atypical retinitis and haemorrhagic cystitis in AIDS patients. Here, the effects of human immunodeficiency virus type 1 (HIV-1) proteins Tat and Vpr on BKV transcription were investigated and it was demonstrated that Tat dramatically stimulated BKV E . Site-directed mutagenesis analysis of potential Tat-responsive transcriptional motifs complemented by an electrophoretic mobility shift assay (EMSA) showed that Tat activated BKV E by inducing binding of the NF- κ B p65 subunit to a κ B motif near the 3′ end of BKV E . In addition, a sequence within the 5′ UTR of BKV E transcripts (BKV E -TAR) was identified that is identical to the HIV-1 transactivation response (TAR) element. The BKV E -TAR sequence bound TAT in RNA EMSA assays and deletion of the BKV E -TAR sequence eliminated Tat transactivation of BKV E transcription. Thus, Tat positively affected BKV E transcription by a dual mechanism and this may be important in diseases involving BKV reactivation in AIDS patients." @default.
- W2098889173 created "2016-06-24" @default.
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- W2098889173 date "2006-06-01" @default.
- W2098889173 modified "2023-10-06" @default.
- W2098889173 title "Activation of early gene transcription in polyomavirus BK by human immunodeficiency virus type 1 Tat" @default.
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- W2098889173 doi "https://doi.org/10.1099/vir.0.81569-0" @default.
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