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- W1965450484 abstract "The caseinolytic enzymes of the midgut lumina and epithelia of Leucophaea were purified through precipitation by 60% saturated (NH4)2SO4, followed by gel permeation on Sephadex G-200 and subsequent DEAE anionexchange chromatography. At least four peaks with enzyme activity were eluted from anionexchange chromatography columns. Gregarines of the midgut lumen apparently do not contribute to the caseinolytic activity within the midgut. Elution profiles of lumen and epithelial enzymes were nearly identical. The same enzymes were identified in the lumina of epithelial microsomal vesicles. This allows the conclusion that these enzymes are produced by the midgut epithelia. Practically all protease activity of the midgut was found in the posterior half, both in the lumen and epithelium. Feeding stimulated protease production primarily in the posterior midgut. The pH optimum of the proteases lay between 9.0 and 9.5 which was closely matched by the observed pH of the posterior midgut where most of the activity is seen. The anterior midgut pH was determined to be around 8.0. The anterior midgut of Leucophaea contained a heatstable protease inhibitor with characteristics of a competitive inhibitor. This inhibitor was precipitable by 60% saturated (NH4)2SO4 and eluted from a Sephadex G-200 column more or less together with the proteases. From a DEAE anionexchange column it was eluted by 0.8 M NaCl, i.e. after the main portion of the proteases. The biological significance of the protease inhibitor in the anterior portion of the midgut is obscure." @default.
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- W1965450484 date "1980-01-01" @default.
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- W1965450484 title "The proteases and the protease inhibitor in the midgut of Leucophaea maderae" @default.
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- W1965450484 doi "https://doi.org/10.1016/0022-1910(80)90044-x" @default.
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