Figure 2.
Gradient fractionation of vps-ts sec6-4 mutants. Strains were grown at 24°C in SD with required amino acids for maintaining plasmids (vps4-ts sec6, EHY348; pep12-ts sec6, EHY413) or in YPD (vps27-ts sec6, EHY374; vps4Δ sec6, EHY327). Strains grown in SD were shifted to YPD at 24°C for 2 h before 30- or 60-min shifts to 37°C in prewarmed YPD, pH 4.5. (Bottom right) A single culture of vps4Δ sec6 cells was split in half; one half was maintained at 24°C and the other half shifted to 32°C (semi-permissive for sec6-4) for 1h. Cells were fractionated as for Fig. 1, and gradient fractions were assayed for invertase and exoglucanase activities.