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• W2051404715 abstract "A lysosomal aspartic protease with cathepsin D activity, from the mosquito, Aedes aegypti, was purified and characterized. Its isolation involved ammonium sulfate (30–50%) and acid (pH 2.5) precipitations of protein extracts from whole previtellogenic mosquitoes followed by cation exchange chromatography. Purity of the enzyme was monitored by SDS-PAGE and silver staining of the gels. The native molecular weight of the purified enzyme as determined by polyacrylamide gel electrophoresis under nondenaturing conditions was 80,000. SDS-PAGE resolved the enzyme into a single polypeptide with Mr = 40,000 suggesting that it exists as a homodimer in its non-denatured state. The pI of the purified enzyme was 5.4 as determined by isoelectric focusing gel electrophoresis. The purified enzyme exhibits properties characteristic of cathepsin D. It utilizes hemoglobin as a substrate and its activity is completely inhibited by pepstatin-A and 6M urea but not by 10 mM KCN. Optimal activity of the purified mosquito aspartic protease was obtained at pH 3.0 and 45°C. With hemoglobin as a substrate the enzyme had an apparent Km of 4.2 μ M. Polyclonal antibodies to the purified enzyme were raised in rabbits. The specificity of the antibodies to the enzyme was verified by immunoblot analysis of crude mosquito extracts and the enzyme separated by both non-denaturing and SDS-PAGE. Density gradient centrifugation of organelles followed by enzymatic and immunoblot analyses demonstrated the lysosomal nature of the purified enzyme. The N-terminal amino acid sequence of the purified mosquito lysosomal protease (19 amino acids) has 74% identity with N-terminal amino acid sequence of porcine and human cathepsins D." @default.
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• W2051404715 date "1991-01-01" @default.
• W2051404715 modified "2023-09-27" @default.
• W2051404715 title "Purification and characterization of a lysosomal aspartic protease with cathepsin D activity from the mosquito" @default.
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• W2051404715 doi "https://doi.org/10.1016/0020-1790(91)90047-i" @default.
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