Figure 5.
RNAse T2 cleavage of in vitro transcribed E. coli tRNASer1 and tRNAGln2 incubated with YfhQ and AdoMet. Autoradiography of two-dimensional chromatograms of 5'-phosphate and 3'-phosphate nucleosides on thin layer cellulose plates. [α-32P]UTP-labelled in vitro transcribed tRNASer1 (2.5 × 105 cpm) (a and c) and [α-32P]UTP-labelled in vitro transcribed tRNAGln2 (2.5 × 105 cpm) (b and d) was incubated in the presence (a and b) or absence (c and d) of the YfhQ protein. The reaction mixture contained 50 mM PIPES-Na, pH 7.0, 4 mM MgCl2, 50 μM AdoMet and 5 μg of the purified YfhQ protein. After 90 min incubation at 37°C, the tRNA was recovered, cleaved by RNAse T2, the resulting nucleotides were analyzed as described [38].