FIGURE 9.
Time course of [35S]gpαf transport and Sec22(L213C)-Sec22HA(L213C) mixed dimer formation. Transport reactions were assembled with Sec22(L213C) vesicles containing [35S]gpαf and Sec22HA(L213C) acceptor membranes in the presence of fusion factors and an ATP regeneration system. The reactions were incubated at 23 °C for various times and then processed to determine the amount of Golgi-modified [35S]gpαf (closed circles) or Sec22-Sec22HA mixed dimer (closed squares). The amounts of α1,6-mannose precipitable [35S]gpαf and of mixed Sec22 dimer from the immunoblot (inset) were plotted as a percentage of maximum levels over time. Sly1 immunoblot serves as a loading control.