Figure 2. Catalytic activity of Hog1 is required for its inhibition of global sumoylation.
Whole cell extracts were prepared from wild type, hog1Δmutants, and hog1K52R mutants treated with 1 M sorbitol for the indicated time, resolved by 8% SDS-PAGE, and probed with anti-SUMO (top panel) or anti-phospho-Hog1 (middle panel) antibodies. The equal loading of each lane was confirmed by Ponceau S staining (bottom panel). IB, immunoblotting.