For quantitative determination of ATPase or GTPase activity and high-throughput screen for their inhibitors. Key Features: High sensitivity. Detection of 0.007 U/L ATPase or GTPase activity. Fast and convenient: single reagent, homogeneous "mix-and-measure" assay allows quantitation of enzyme activity within 30 minutes. Robust and amenable to HTS: detection at 620nm greatly reduces potential interference by colored compounds. Z factors of >0.7 are observed in 96-well and 384-well plates. Can be readily automated on HTS liquid handling systems. Method: OD620nm. Samples: ATPase and GTPase. Species: All. Procedure: Assay takes 30 min. Kit size: 200 tests. Detection limit: 0.007 U/L.