Evidence that HIV-1 Encodes an siRNA and a Suppressor of RNA Silencing
نویسندگان
چکیده
منابع مشابه
Size Selective Recognition of siRNA by an RNA Silencing Suppressor
RNA silencing in plants likely exists as a defense mechanism against molecular parasites such as RNA viruses, retrotransposons, and transgenes. As a result, many plant viruses have adapted mechanisms to evade and suppress gene silencing. Tombusviruses express a 19 kDa protein (p19), which has been shown to suppress RNA silencing in vivo and bind silencing-generated and synthetic small interferi...
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The Sugarcane yellow leaf virus (SCYLV) P0, a member of the highly heterologous proteins of poleroviruses, is a suppressor of posttranscriptional gene silencing (PTGS) and has additional activities not seen in other P0 proteins. The P0 protein in previously tested poleroviruses (Beet western yellows virus and Cucurbit aphid-borne yellows virus), suppresses local, but not systemic, PTGS induced ...
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RNA silencing is a host defense mechanism that limits the accumulation and spread of viruses in infected plants. Correspondingly, plant viruses encode suppressors of silencing. In the positive-strand RNA virus Tobacco rattle virus (TRV), the suppressor of silencing is a 16-kDa (16K) protein encoded by RNA1. The suppressor action of the 16K protein is transient and weaker than that of the P19 su...
متن کاملHIV-1 Tat RNA silencing suppressor activity is conserved across kingdoms and counteracts translational repression of HIV-1.
The RNA silencing pathway is an intracellular innate response to virus infections and retro-transposons. Many plant viruses counter this host restriction by RNA silencing suppressor (RSS) activity of a double-stranded RNA-binding protein, e.g., tomato bushy stunt virus P19. Here, we demonstrate P19 and HIV-1 Tat function across the plant and animal kingdoms and suppress a common step in RNA sil...
متن کاملPlant RNAi: How aViral Silencing Suppressor Inactivates siRNA
The three-dimensional structure of an siRNA bound to the tombusvirus p19 protein--a suppressor of gene silencing--provides a first glimpse into how plant viruses can defeat their host's anti-viral RNAi defenses.
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ژورنال
عنوان ژورنال: Immunity
سال: 2005
ISSN: 1074-7613
DOI: 10.1016/j.immuni.2005.03.010