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- W2065572282 abstract "Urease was purified from leaves of mulberry (Morus alba, L.) by ammonium sulfate fractionation, acetone fractionation and sequential column chromatography including Q-Sepharose HP, Phenyl-Sepharose HP, Superdex 200 HR and Mono Q. The enzyme was purified 5700-fold to apparent homogeneity with a recovery of 3.6%. The molecular mass of the enzyme was determined to be 90.5 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis and 175 kDa by gel filtration, indicating that the enzyme was a homodimer. In the western blot analysis, 90.5 kDa subunit of the mulberry leaf urease cross-reacted with antiserum raised against jack bean seed urease. The N-terminal sequence of the first 20 residues of the enzyme revealed that it has a high similarity (80-90%) to ureases from other plant sources, suggesting that the mulberry leaf urease is closely related to other plant ureases. However, the mulberry leaf enzyme showed an optimum pH for activity of 9.0, while the optimum pH of most ureases isolated from plants and bacterial is neutral. In addition, the K(m) value for urea was 0.16 mM, which is lower than those of ureases from other sources. It is also proposed that urease activity ingested by browsing silkworm releases ammonia that is subsequently used in silkworm protein synthesis." @default.
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- W2065572282 date "2000-02-01" @default.
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- W2065572282 title "Purification and properties of urease from the leaf of mulberry, Morus alba" @default.
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- W2065572282 doi "https://doi.org/10.1016/s0031-9422(99)00521-x" @default.
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