Figure 3. Isolation of Rho*–Gte complex by sucrose-gradient centrifugation.

Fractions 1–13 (250 μl each) were collected from the top to the bottom of a sucrose gradient after overnight ultracentrifugation. A 20 μl aliquot of each fraction was analysed by SDS/PAGE. Upper panel: separation of the Rho*–Gte complex from excess Rho*. Fractions containing the highest concentrations of the Rho*–Gte complex are indicated with *. Lower panel: dissociation of the Rho*–Gte complex by 200 μM GTP[S]. Fractions containing GtGTP[S] are indicated with ˆ. Figure adapted, with permission, from [95], © 2009 The Federation of American Societies for Experimental Biology.