期刊
VIROLOGY
卷 489, 期 -, 页码 75-85出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2015.11.032
关键词
Cytomegalovirus; PKR; Translation; Double-stranded RNA; TRS1; IRS1; Host defense
类别
资金
- National Institute of Allergy and Infectious Diseases of the National Institutes of Health NIH [RO1AI027762]
- National Institute of General Medical Sciences, Public Health Service, National Research Service Award [T32 GM007270]
Human cytomegalovirus (HCMV) lacking TRS1 and IRS1 (HCMV[Delta I/Delta T]) cannot replicate in cell culture. Although both proteins can block the protein kinase R (PKR) pathway, they have multiple other activities and binding partners. It remains unknown which functions are essential for HCMV replication. To investigate this issue, we first identified a TRS1 mutant that is unable to bind to PKR. Like HCMV[Delta I/Delta T], a recombinant HCMV containing this mutant (HCMV[TR51-Mut 1]) did not replicate in wild-type cells. However, HCMV[Delta I/Delta T] did replicate in cells in which PKR expression was reduced by RNA interference. Moreover, HCMV[Delta I/Delta T] and HCMV[TR51-Mut 1] replicated to similar levels as virus containing wild type TRS1 in cell lines in which PKR expression was knocked out by CRISPR/Cas9-mediated genome editing. These results demonstrate that the sole essential function of TRS1 is to antagonize PKR and that its other activities do not substantially enhance HCMV replication, at least in cultured human fibroblasts. (C) 2015 Elsevier Inc. All rights reserved.
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