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. 2023 Feb 18;6:193. doi: 10.1038/s42003-023-04570-2

Fig. 6. SARS-CoV-2 Ubl1 inhibits N protein binding to RNA.

Fig. 6

a Ubl1 disrupts N-RNA binding in a dose-dependent manner according to EMSA assay. Lane C: ssRNA/ssDNA; Lane U: Ubl1 + ssRNA/ssDNA, Lane 0: N + ssRNA/ssDNA. Lanes 1–5, ssRNA/ssDNA plus different molar ratios of Ubl1 to N protein (from 1:5 to 5:5). The amount of free ssRNA/ssDNA from the N-RNA complex increases with increasing concentrations of Ubl1 in Lanes 1–5. b Curve fit of MST traces for determination of the N-ssRNA binding affinity. ce The binding affinity of N protein and ssRNA decreases with the addition of 1 μM (c), 5 μM (d) and 10 μM (e) of Ubl1. No interaction between Ubl1 and ssRNA was detected (ce, right). The error bar represents the standard error of the mean of three independent experiments (n = 3).