摘要:
A class of subtilisin analogs suitable for admixture to cleaning compositions and having improved stability over naturally occurring Bacillus subtilisins are prepared by expressing a modified gene encoding the subtilisin analog in Bacillus subtilis. The subtilisin analogs are characterized as having a modified calcium binding site to improve calcium binding and either an Asn or a Gly replaced in any Asn-Gly sequences present in the subtilisin.
摘要:
A novel alkaline protease having the same amino acid sequence as protease derived from Bacillus licheniformis excluding at lease one of 105th and 221st amino acids, i.e., aspartic acid and glutamic in place of the glycin and methioninc, respectively. The protease is useful as detergents.
摘要:
Zur Gewinnung von Subtilisin werden Bakterien des Genus Bacillus in einem Fermenter auf synthetischem Medium kultiviert, wobei in einer ersten Anwachsphase mit einer NH₄-Anfangskonzentration von 0,5 bis 150 mM, insbesondere 1 bis 50 mM und Nachdosierung der C-Quelle für die Aufrechterhaltung ihrer Konzentration im Bereich von 100 mM bis 1 M bis zum Absinken der Ammoniumkonzentration unter einen N-limitierenden Wert in der Kultur zwischen 0,05 und 2 mM, insbesondere 0,1 und 0,3 mM gearbeitet wird, wonach der N-limitierende Wert der Ammoniumkonzentration aufrechterhalten und der Gehalt der C-Quelle zwischen 10 mM und 2 M eingestellt wird bis zum Ende der Produktionsphase, wonach das gebildete Subtilisin abgesondert wird. Als C-Quelle werden insbesondere Glycerin, Acetat oder Hexosen verwendet. Vorzugsweise wird die Biomassekonzentration im Medium durch Nachfüttern von C-Quelle erhöht. Ein Sauerstoffpartialdruck über der Kultur von > 11,5 Pa ist zweckmäßig. Als Proteaseproduzent dient insbesondere Bacillus licheniformis DSM 1969.
摘要:
Bacillus strains having reduced levels of extracellular protease are produced by replacing the native chromosomal DNA sequence comprising the gene for an extracellular protease, such as subtilisin, with a partially homologous DNA sequence having an inactivating DNA segment inserted therein. The strains are useful as hosts for the expression and secretion of heterologous polypeptides or proteins.
摘要:
Novel methods and novel industrial unicellular microorganism strains, particularly industrial Bacillus strains, are provided for enhanced production of endogenous and exogenous polypeptides. Cloning vehicles containing one or more copies of the gene expressing the polypeptide of interest are introduced into a compatible host, the transformed hosts treated to form protoplasts and then fused with protoplast acceptors prepared from industrial strains. Efficient transfer of the vehicle containing the genes of interest is achieved, with the resulting modified industrial strains being effective producers of the desired polypeptide product.
摘要:
Disclosed herein are compositions for the treatment of a disease in an animal including yeast extract of Saccharomyces cerevisiae, Bacillus licheniformis or Bacillus subtilis spores, and a carrier. Also included are animal feed compositions including the composition for the prevention, control and/or treatment of a disease in an animal and an animal's food/feed. The compositions are useful to prevent, control, and treat diseases such as necrotic enteritis in poultry when used in combination with an anticoccidal ionophore or coccidiosis vaccine.
摘要:
The present invention relates to subtilase subtilases with an altered immunogenicity, particu-larly subtilases with a reduced allergenicity. Furthermore, the invention relates to expression of said subtilase variants and subtilases and to their use, such as in detergents and oral care products.
摘要:
The present invention relates to method for screening chemically modified mutant enzymes for amidase and/or esterase activity. This method includes providing a chemically modified mutant enzyme with one or more amino acid residues from an enzyme being replaced by cysteine residues, where at least some of the cysteine residues are modified by replacing thiol hydrogen in the cysteine residues with a thiol side chain, contacting the chemically modified mutant enzyme with a substrate for an amidase and/or a substrate for an esterase and determining whether the chemically modified mutant enzyme exhibits amidase and/or esterase activity. The presentinvention also relates to chemically modified mutant enzymes and a method for producing them where one or more amino acid residues from an enzyme are replaced by cysteine residues, and the cysteine residues are modified by replacing at least some of the thiol hydrogen in the cysteine residue with a thiol side chain to form the chemically modified mutant enzyme. The thiol side chain is selected from the group consisting of -SCH2(p-CH3-C6H4), -SCH2(p-OCH3-C6H4), -SCH2(p-CF3-C6H4), and -SCH2(2,4-diNO2-C6H3).