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Just before spinning, larvae of the silkworm, Bombyx mori, absorb intact urease of the host plant (mulberry leaf) from the midgut lumen into the hemolymph. In order to investigate whether the transport of the mulberry leaf urease is selective, crude proteins extracted from the mulberry leaves were labeled with biotin and orally administered to the fifth instar larvae. The biotinylated proteins transported...
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...
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