Title: Activation of the PCSM-protein phosphatase by a Ca2+-dependent protease
Authors: Waelkens, Etienne ×
Goris, Jozef
Merlevede, Wilfried #
Issue Date: Dec-1985
Series Title: FEBS Letters vol:192 issue:2 pages:317-20
Abstract: The inhibitor-1 phosphatase but not the phosphorylase phosphatase activity of a newly discovered 250 kDa polycation-stimulated (PCSM) protein phosphatase in rabbit skeletal muscle is increased up to 10-fold by a Ca2+-dependent protease. The enzyme-directed protease effect to which the PCSH and PCSL phosphatases are insensitive was progressively lost during purification of the enzyme. This could be explained by either a slow conversion of the enzyme to an active form of the enzyme with a change in specificity, or the loss of a protease-sensitive inhibitor of the inhibitor-1 phosphatase activity, resulting in a PCS phosphatase characterized by its high inhibitor-1/phosphorylase alpha activity ratio. The Ca2+-dependent protease is completely inhibited by EGTA or leupeptin.
ISSN: 0014-5793
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biochemistry Section (Medicine) (-)
Laboratory of Protein Phosphorylation and Proteomics
Laboratory of Phosphoproteomics (-)
× corresponding author
# (joint) last author

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