کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6140728 | 1594255 | 2014 | 10 صفحه PDF | دانلود رایگان |
- Function of HHV-6B U19 is examined by transgene expression.
- U19 expression upregulates p53 in the cytoplasm.
- U19 has a p53-like binding motif for HDM2.
- U19 co-localizes with HDM2 in the nucleus in vivo and is pulled down with HDM2.
- Mutations within U19 p53-like binding motif abolish binding to HDM2.
In order to establish a successful infection, it is of crucial importance for invading viruses to alter the activities of the regulatory protein p53. Beta-herpesviruses stabilize p53 and likely direct its activities towards generation of a replication-friendly environment. We here study the mechanisms behind HHV-6B-induced stabilization and inactivation of p53. Stable transgene expression of the HHV-6B protein U19 was sufficient to achieve upregulation of p53. U19 bound directly to the p53-regulating protein HDM2 in vitro, co-precipitated together with HDM2 in lysates, and co-localized with HDM2 in the nucleus when overexpressed. U19 contained a sequence with a putative p53 BOX I-motif for HDM2 binding. Mutation of the two key amino acids within this motif was sufficient to inhibit all the described U19 functions. Our study provides further insight into p53-modulating strategies used by herpesviruses and elucidates a mechanism used by HHV-6B to circumvent the antiviral response.
Journal: Virology - Volume 448, 5 January 2014, Pages 33-42