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The nucleocapsid protein is significant in the formation of viral RNA of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), accounting for the largest proportion of viral structural proteins. Here, we report for the first time that the 11S proteasomal activator PA28γ regulates the intracellular abundance of the SARS-CoV-2 N protein (nCoV N). Furthermore, we have identified proteasome activator PA28γ as a nCoV N binding protein by co-immunoprecipitation assay. As a result of their interaction, nCoV N could be degraded by PA28γ-20S in vitro degradation assay. This was also demonstrated by blocking de novo protein synthesis with cycloheximide. The stability of nCoV N in PA28γ-knockout cells was greater than in PA28γ-wildtype cells. Notably, immunofluorescence staining revealed that knockout of the PA28γ gene in cells led to the transport of nCoV N from the nucleus to the cytoplasm. Overexpression of PA28γ enhanced proteolysis of nCoV N compared to that in PA28γ-N151Y cells containing a dominant-negative PA28γ mutation, which reduced this process. These results suggest that PA28γ binding is important in regulating 20S proteasome activity, which in turn regulates levels of the critical nCoV N nucleocapsid protein of SARS-CoV-2, furthering our understanding of the pathogenesis of COVID-19.
Accumulating evidence has been found that circular RNA (circRNA) plays a critical role in the initiation and development of various diseases by modulating gene expression in the cytoplasm. However, the role of circ_0044366 (termed circ29) in gastric cancer (GC) has yet to be elusive. We detected that exosomal circ29 was confirmed to be highly expressed in GC and can significantly impair the proliferation, migration, tube formation of HUVEC by exosomal communication. Interestingly, this effect could be blocked by the effect of miR-29a. In brief, we confirmed that circ29, as a sponge of miR-29a, plays a responsible role in the occurrence and development of GC by regulating the VEGF pathway. Therefore, it may be used as a potential target for the treatment of GC.
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