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Title: Identification and partial characterization of a latent ATP, Mg-dependent protein phosphatase in rabbit skeletal muscle cytosol
Authors: Vandenheede, Jackie ×
Staquet, Sigrid
Merlevede, Wilfried #
Issue Date: Oct-1989
Series Title: Molecular and cellular biochemistry. vol:87 issue:1 pages:31-9
Abstract: Fractionation of rabbit skeletal muscle cytosol on Aminohexyl-Sepharose has resulted in the identification of a latent ATP, Mg-dependent protein phosphatase whose catalytic subunit is in the active conformation, but is inhibited by the presence of more than one modulator unit. The partially purified enzyme is converted to an inactive, kinase FA-dependent form upon incubation at 30 degrees C unless modulator-specific polyclonal antibodies are added to the preparation. The immunoglobulins also relieve the inhibition which is responsible for the low basal phosphatase activity of the enzyme, and they counteract all of the heat-stable inhibitor activity present in the preparation. Addition of free catalytic subunit abolishes the inhibition of the latent enzyme in a dose-dependent way, but cannot prevent the inactivation process. The inactivated phosphatase and the original latent enzyme exhibit the same apparent Mr in sucrose density-gradient centrifugation (70,000) and in gel filtration (110,000).
ISSN: 0300-8177
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biochemistry Section (Medicine) (-)
× corresponding author
# (joint) last author

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