摘要:
A method of identifying nucleotide sequences coding for signal peptides in lactic acid bacteria, using a DNA molecule comprising a transposon including a promoterless reporter gene from which DNA molecule a region between the LR and the reporter gene is deleted and the DNA molecule comprises a DNA sequence coding for a secretion reporter molecule. By deleting the region between the LR and the reporter gene, stop codons in-frame with the secretion reporter molecule is removed which upon transposition permits translational fusions from upstream the LR.
摘要:
The invention provides a fed-batch or continuous process for producing heterologous peptides, polypeptides or proteins in lactic acid bacteria, comprising the steps of (i) constructing a recombinant lactic acid bacterium comprising a nucleotide sequence coding for the heterologous peptide, polypeptide or protein, and appropriate regulatory nucleotide sequences such as regulatable promoters and signal peptides to control the expression of the coding sequence and the secretion of gene product, (ii) cultivating the recombinant bacterium under or continuous cultivation conditions to express the gene, and (iii) harvesting the recombinant bacterium or the gene product. Preferably, the cultivation medium is a chemically defined or synthetic medium optionally supplemented with yeast extract.
摘要:
Expression vectors capable of being replicated in lactic acid bacterial cells comprising a promoter region comprising (a) a promoter sequence element the function of which is regulatable by an environmental or growth condition factor and (b) at least one further nucleotide sequence element, the position, orientation, presence and/or sequence of which element has a regulatory effect on the expression of a gene operably linked to the promoter region in which vectors the position, orientation, presence and/or sequence of at least one of said elements (a) or (b) is modified relative to the position, orientation, presence and/or sequence of the corresponding non-modified element whereby the expression of the gene is altered, and a lactic acid bacterium which is transformed with such a vector as defined above are provided. The recombinant cells containing such a regulatable or inducible gene expression system are useful as food or feed starter cultures or as strains for the production of gene products such as pharmaceutically or immunologically active compounds including oligo- or polypeptides derived from a Mycobacterium species including M. tuberculosis.
摘要:
A method of isolating a lactic acid bacterial DNA fragment comprising a promoter, the method comprising introducing a DNA molecule comprising a transposable element comprising a promoterless structural gene as a promoter probe gene into a population of a lactic acid bacterium, methods of constructing a recombinant lactic acid bacterium comprising a regulatable promoter by using the above method, a recombinant lactic acid bacterium comprising a gene coding for a desired gene product and operably linked thereto a regulatable lactic acid bacterial promoter not natively associated with the gene, the use of such a recombinant lactic acid bacterium and recombinant plasmids comprising a regulatable lactic acid bacterial promoter.
摘要:
The invention covers a novel treatment strategy that considerably improves conventional probiotic treatments of inflammatory bowel diseases, irritable bowel syndrome and other gastrointestinal disorders. Both probiotic microorganisms and the carrier of the probiotic microorganisms in form of a fermented cereal gruel are used as treatment effectors. Phospholipids may also be an effecter. The novel treatment strategy is capable of removing the symptoms of inflammatory bowel diseases regardless of a mild, moderate or severe stage of the disease.
摘要:
The invention covers a novel treatment strategy that considerably improves conventional probiotic treatments of inflammatory bowel diseases, irritable bowel syndrome and other gastrointestinal disorders. Both probiotic microorganisms and the carrier of the probiotic microorganisms in form of a fermented cereal gruel are used as treatment effectors. Phospholipids may also be an effector. The novel treatment strategy is capable of removing the symptoms of inflammatory bowel diseases regardless of a mild, moderate or severe stage of the disease.
摘要:
The invention covers a novel treatment strategy that considerably improves conventional probiotic treatments of inflammatory bowel diseases, irritable bowel syndrome and other gastrointestinal disorders. Both probiotic microorganisms and the carrier of the probiotic microorganisms in form of a fermented cereal gruel are used as treatment effectors. Phospholipids may also be an effecter. The novel treatment strategy is capable of removing the symptoms of inflammatory bowel diseases regardless of a mild, moderate or severe stage of the disease.
摘要:
The present invention pertains to a composition for the manufacture of a medicament comprising living or dead bacteria with controlled amounts of surface-coupled proteins or proteinaceous compounds and a method for the preparation of the composition. The bacterium provides a multivalent heterologous protein display vehicle that may be used in the manufacture of vaccines or medicaments for delivery via the mucosa.