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  • Title: [Purification and properties of alpha-amylases in morphological variants of Bacillus subtilis].
    Author: Bakhmatova IV, Bal'sis AB, Chiurlis TK, Glemzha AA, Ianulaĭtene KK.
    Journal: Prikl Biokhim Mikrobiol; 1984; 20(6):804-9. PubMed ID: 6441162.
    Abstract:
    Extracellular alpha-amylases were isolated from the culture medium filtrates of Bacillus subtilis R-623 morphological variants R, P and S by means of biospecific chromatography on artificial sorbents and then purified to homogeneity. Some properties of purified alpha-amylases were being studied. The molecular weight of alpha-amylases from Bacillus subtilis variants R, P and S equals 57,000, 58,000 and 56,000, and the isoelectric points are at pH 5.4, 5.6 and 5.1, respectively. pH optimum for alpha-amylase from variants R and P is 4.5, and for that from variant S--5.0. alpha-Amylases from Bacillus subtilis R-623 morphological variants are thermostable enzymes. According to the properties studied, they correspond to Bacillus subtilis alpha-amylases that were isolated and described by other researchers.
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