Fig. 7. aIF2/5B enhances in vitro translation of leadered and leaderless mRNAs.
Top. Autoradiography of SDS-PAGEs after electrophoresis of the radiolabelled proteins synthesized in a S. solfataricus in vitro translation systems programmed with increasing amounts of aIF2/5B mRNA and fixed amounts of a leaderless (α-fucosidase) or a leadered (104) mRNA. Lane 1: 10 pmol of α-fuc or 10 pmol of 104 mRNA in the absence of aIF2/5B mRNA; Lanes 2–4: same with 10, 20 and 40 pmol, respectively, of aIF2/5B mRNA. Bottom. Curve obtained by quantifying with a Molecular Dynamics Phosphoimager the radioactivity retained in the bands as shown in the top panel. The relative increment on the y-axis is the ratio between radioactivity values in the absence of added aIF2/5B mRNA and values measured in the presence of the indicated amounts of aIF2/5B mRNA.