FIGURE 7.
In vitro splicing activity of isolated CP1 domain-based ymLeuRS Trp-238 mutants. Evaluation of in vitro bI4Δ1168 pre-RNA splicing with respect to processing of substrate pre-RNA (A), fraction of bI4 excised intron (B), and fraction of the ligated B4-B5 exons (C) is shown. Splicing reactions incorporated 1 μm concentrations of substrate pre-RNA and 1 μm LeuRS and were initiated with 1 mm guanosine. ▴, WT ymCP1-βext; ●, W238C ymCP1-βext. Error bars for each time point result from each reaction repeated in triplicate.