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Domain Within the C Protein of Human Parainfluenza Virus Type 3 That Regulates Interferon Signaling

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Human parainfluenza virus type 3 (HPIV3), one of the paramyxoviruses, uses its accessory C protein as an antagonist against interferon (IFN)-mediated host innate immunity. We have previously shown that the C protein significantly decreased the IFN-induced phosphorylation of signal transducer and activator of transcription (Stat) 1 and the formation of gamma IFN activation factor (GAF) complex, thus abrogating the antiviral activity of the IFNs against vesicular stomatitis virus (VSV) replication. Here, by mutational analyses we demonstrated that the N-terminal truncation of the C protein (CN25 and CN50) substantially (50%) recovers the IFN-induced responses, suggesting the critical role of the N-terminal region of the C protein in IFN signaling. Furthermore, our results indicate that the charged amino acid residues within the N-terminal region of the C protein regulate the antagonistic effect of the C protein on IFN signaling.
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Keywords: C protein; Human parainfluenza virus type 3 (HPIV3); Interferon (IFN) antagonist

Document Type: Research Article

Affiliations: Virology Section, Department of Molecular Genetics, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA

Publication date: January 1, 2010

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  • Gene Expression, The Journal of Liver Research will publish articles in all aspects of hepatology. Hepatology, as a research discipline, has seen unprecedented growth especially in the cellular and molecular mechanisms of hepatic health and disease, which continues to have a major impact on understanding liver development, stem cells, carcinogenesis, tissue engineering, injury, repair, regeneration, immunology, metabolism, fibrosis, and transplantation. Continued research and improved understanding in these areas will have a meaningful impact on liver disease prevention, diagnosis, and treatment. The existing journal Gene Expression has expanded its focus to become Gene Expression, The Journal of Liver Research to meet this growing demand. In its revised and expanded scope, the journal will publish high-impact original articles, reviews, short but complete articles, and special articles (editorials, commentaries, opinions) on all aspects of hepatology, making it a unique and invaluable resource for readers interested in this field. The expanded team, led by an Editor-in-Chief who is uniquely qualified and a renowned expert, along with a dynamic and functional editorial board, is determined to make this a premier journal in the field of hepatology.
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