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- W2041977269 abstract "Neutrophils stimulated with the chemoattractant fMet-Leu-Phe (fMLP) are known to exhibit rapid activation of four protein kinases with molecular masses of ~69, ~63, ~49, and ~40-kDa. Activation of these kinases is blocked by antagonists of phosphatidylinositol 3-kinase and type 1 and/or type 2A protein phosphatases. These enzymes can be detected by their ability to undergo renaturation and catalyze the phosphorylation of a peptide substrate that corresponds to amino acid residues 297-331 of the 47-kDa subunit of the NADPH-oxidase complex fixed within a gel. In this report, we demonstrate that an antibody generated to a fusion protein containing amino acid residues 175-306 of p21-activated protein kinase 1 (Pak1) reacts with three proteins in guinea pig neutrophils with molecular masses in the 60-70-kDa range during Western blotting. This antibody immunoprecipitates both the 69- and 63-kDa renaturable kinases from lysates of stimulated cells along with a minor 60-kDa kinase. No activities were observed for any of these enzymes in immunoprecipitates from unstimulated neutrophils. However, addition of ATP and activated Rac 1 or Cdc42 to immunoprecipitates from unstimulated cells resulted in the stimulation of two renaturable kinases with molecular masses in the 69- and 63-kDa range. These immunoprecipitates also contained two novel protein kinases with masses of ~49 and 40 kDa that were selectively activated by Cdc42. In contrast, the 69- and 63-kDa kinases were not immunoprecipitated from lysates of stimulated neutrophils with an antibody to Pak2 or with nonimmune serum. These data indicate that the renaturable 69- and 63-kDa kinases are Paks and reveal some of the upstream events that are necessary for the rapid activation of this family of protein kinases in neutrophils." @default.
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- W2041977269 date "1996-10-01" @default.
- W2041977269 modified "2023-10-11" @default.
- W2041977269 title "The Renaturable 69- and 63-kDa Protein Kinases That Undergo Rapid Activation in Chemoattractant-stimulated Guinea Pig Neutrophils Are p21-Activated Kinases" @default.
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- W2041977269 doi "https://doi.org/10.1074/jbc.271.40.24869" @default.
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