title: Proteases involved in generation of beta- and alpha-amylases from a large amylase precursor in Bacillus polymyxa.
abstract: The genes for extracellular neutral protease (Npr) and intracellular serine protease (Isp) were cloned from Bacillus polymyxa in order to elucidate the process involved in the generation of multiple beta-amylases and an alpha-amylase from a large amylase precursor. The npr gene was composed of 1,770 bp and 570 amino acids, while the isp gene was composed of 978 bp and 326 amino acids. Both proteases produced by E. coli cleaved the amylase precursor to generate beta- and alpha-amylases. Furthermore, several other proteases produced the same products from the precursor. A 130-kDa amylase precursor has two large domain structures responsible for the generation of beta- and alpha-amylases. The junction region of approximately 200 amino acids may be exposed on the surface of the molecule and susceptible to proteolytic enzymes, which results in the formation of multiple amylases.
authors.affiliation: Department of Food Science and Technology, Faculty of Agriculture, Nagoya University, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Takekawa
authors.forename: N
authors.initials: N
authors.lastname: Uozumi
authors.forename: N
authors.initials: N
authors.lastname: Tsukagoshi
authors.forename: S
authors.initials: S
authors.lastname: Udaka
mesh_terms: D000595:Amino Acid Sequence; D001407:Bacillus / Q000201:enzymology* / Q000235:genetics; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial; D010450:Endopeptidases / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D011498:Protein Precursors / Q000378:metabolism*; D011499:Protein Processing, Post-Translational; D015183:Restriction Mapping; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism; D000516:alpha-Amylases / Q000378:metabolism*; D001614:beta-Amylase / Q000378:metabolism*
chemical_list: D004269:DNA, Bacterial; D011498:Protein Precursors; D000516:alpha-Amylases; D001614:beta-Amylase; D010450:Endopeptidases; D012697:Serine Endopeptidases