Steroid-transporting ATPase

Steroid-transporting ATPase (, pleiotropic-drug-resistance protein, PDR protein) is an enzyme with systematic name ATP phosphohydrolase (steroid-exporting). This enzyme catalyses the following chemical reaction


 * ATP + H2O + steroidin $$\rightleftharpoons$$ ADP + phosphate + steroidout

This enzyme has two similar ATP-binding domains.