Drs2p ATPase activity associates with the faster mobility form.
A, purified TAPN-Drs2p-TAPC before separation (III(N)), the unbound fraction from the calmodulin column (lane U), and the bound and eluted fraction (lane B) were subjected to SDS-PAGE and Western blotting with anti-Drs2p. The upper arrowhead indicates the intact TAPN-Drs2p-TAPC form, and the lower arrowhead indicates the faster mobility form. B, ATPase activity was assayed with purified TAPN-Drs2p-TAPC before separation and the two fractions after separation.