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A direct colorimetric assay for Ca2+ -stimulated ATPase activity.

作者信息

Chan K M, Delfert D, Junger K D

出版信息

Anal Biochem. 1986 Sep;157(2):375-80. doi: 10.1016/0003-2697(86)90640-8.

DOI:10.1016/0003-2697(86)90640-8
PMID:2946250
Abstract

A simple and rapid colorimetric assay for measuring the high affinity Ca2+-ATPase activity in subcellular fractions is presented. With this method a one-step addition of a malachite green/molybdate/polyvinyl alcohol reagent to the assay mixture at the end of the incubation period is all that is required for the spectrophotometric quantification of the phosphomolybdate-malachite green complex. The presence of polyvinyl alcohol allows the quantification of released phosphate without having to separate it from protein. We have validated this assay by characterizing the high affinity Ca2+-ATPase activity in isolated rat liver microsomes. Comparable Ca2+-ATPase activities in rat liver microsomes and adipocyte plasma membranes were found when measured with this colorimetric assay and an isotopic assay. This method is applicable to the measurement of other types of ATPase activities.

摘要

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A direct colorimetric assay for Ca2+ -stimulated ATPase activity.
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