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• W2034791616 abstract "The 700-kDa multicatalytic proteinase complex from bovine pituitaries separates in polyacrylamide gel electrophoresis under dissociating and reducing conditions into 11 components with molecular masses ranging from 21 to 32 kDa. No higher molecular mass components were detected. A rabbit polyclonal antibody raised against the complex recognizes five immunoreactive components. As reported previously, the complex exhibits three distinct proteolytic activities designated as chymotrypsin-like, trypsin-like, and peptidylglutamyl-peptide hydrolyzing activities. All three activities are rather rapidly inactivated by 3,4-dichloroisocoumarin, a general serine protease inhibitor, however, the pseudo-first-order rate constants of inactivation of the three components differ within a wide range, with the chymotrypsin-like activity being most sensitive to inhibition. The peptidylglutamyl-peptide hydrolyzing activity is greatly activated by low concentrations of sodium dodecyl sulfate and fatty acids and seems to constitute the main component responsible for degradation of protein substrates. In addition to cleaving bonds on the carboxyl side of glutamyl residues, this activity also cleaves, albeit at a slower rate, bonds on the carboxyl side of hydrophobic residues; however, the secondary specificity of this component is clearly different from the chymotrypsin-like activity. Heparin selectively activates the chymotrypsin-like activity. The complex cleaves rapidly both native and dephosphorylated beta-casein in a reaction greatly accelerated by low concentrations of sodium dodecyl sulfate. The nature of proteolytic products, and also the rate of formation of acid-soluble, ninhydrin-reactive products, is different for the phosphorylated and dephosphorylated form of beta-casein, indicating that the degree of phosphorylation influences the rate and pattern of proteolysis.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W2034791616 created "2016-06-24" @default.
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• W2034791616 date "1989-11-01" @default.
• W2034791616 modified "2023-10-18" @default.
• W2034791616 title "Pituitary multicatalytic proteinase complex. Specificity of components and aspects of proteolytic activity" @default.
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• W2034791616 doi "https://doi.org/10.1021/bi00450a006" @default.
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