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- W1992053145 abstract "Using soluble starch as a substrate five isoforms of alpha-amylase were identified in a crude extract of Morimus funereus larvae. The main alpha-amylase (termed AMF-3) was purified by gel filtration chromatography and anion exchange chromatography to obtain a single band on sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE). Its enzymatic purity was confirmed by an in-gel activity assay after SDS-PAGE. The purity of AMF-3 was increased 112-fold with a 15.4% yield. AMF-3 had apparent molecular masses of 33 and 31 kDa when analysed using SDS-PAGE and Superdex 75 FPLC gel filtration chromatography, respectively and a calculated isoelectric point of 3.2. Purified AMF-3 showed maximal activity at pH 5.2 and had an optimum activity temperature of 45 degrees C. AMF-3 retained over 90% of its maximum activity at temperatures from 45 to 60 degrees C. AMF-3 exhibited a high affinity towards soluble starch with a K(m) value of 0.43 mg/mL. Maximal AMF-3 activity was achieved in the presence of 0.1 mM CaCl(2), while at higher concentrations its activity decreased. AMF-3 activity increased with increasing NaCl concentration. AMF-3 activity was significantly inhibited by alpha-amylase wheat inhibitor. Using a number of raw starch substrates maximum AMF-3 activity was achieved with horse-radish starch, in contrast to undetectable activity towards potato starch." @default.
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- W1992053145 date "2008-01-01" @default.
- W1992053145 modified "2023-10-06" @default.
- W1992053145 title "Purification and properties of midgut α-amylase isolated from Morimus funereus (Coleoptera: Cerambycidae) larvae" @default.
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- W1992053145 doi "https://doi.org/10.1016/j.cbpb.2007.09.009" @default.
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