摘要:
The invention concerns a composition containing stabilised particles of cationic transfection agent(s)/nucleic acid complexes characterised in that it includes besides said transfection agent and nucleic acid at least a non-ionic surfactant in sufficient amount for preventing the aggregation of the particles in course of time. In a preferred embodiment, the surfactant is a polyoxyalkylene or a derivative thereof.
摘要:
Cells with an alteration at least in the gene involved in betaine catabolism, their preparation and their use, in particular for producing metabolites and/or enzymes, are disclosed.
摘要:
The invention concerns mutant microorganisms blocked in a step of Streptogramin biosynthesis and methods for preparing cells blocked in a step of Streptogramin biosynthesis.
摘要:
A prokaryotic recombinant host cell comprising a heterologous replication initiation protein that activates a conditional origin of replication and an extrachromosomal DNA molecule comprising a heterologous therapeutic gene and a conditional origin of replication whose functionality in the prokaryotic recombinant host cell requires a replication initiating protein which is foreign to the host cell is described. The host cell may comprise a pir gene having at least one mutation, which may occur in the pir gene copy number control region, the pir gene leucine zipper-like motif, or the pir gene DNA binding region.
摘要:
The present invention relates to a biosynthetic process for preparing cobalamines. More precisely, it relates to a process for amplifying the production of cobalamines and, more specifically, of coenzyme B.sub.12 by means of recombinant DNA techniques and/or by means of adding a novel cobalamine precursor.
摘要:
The invention concerns nucleotide sequences coding for a polypeptide involved in Streptogramin biosynthesis, recombinant cells containing said sequences, and use thereof.
摘要:
The present invention relates to new cloning and/or expression vectors having a broad host range in Gram-negative bacteria, in particular, in the production of recombinant proteins or of metabolites, or in bioconversion reactions, as well as to the host cells containing such vectors.
摘要:
Expression plasmids comprising a nucleic acid sequence of interest controlled by a T7 bacteriophage promoter and a stabilizing region comprising all or part of the par region of the RP4 plasmid or a derivative thereof. The invention also concerns the use of said plasmids in the production of recombinant products.
摘要:
Disclosed is the nucleic acid sequences for polypeptides and enzymes involved in the biosynthesis of streptogramins from Streptomyces sp. and the corresponding amino acid sequences. Also disclosed are recombinant vectors and cells as well as methods of making the polypeptides, enzymes and streptogramins using the recombinant host cells.
摘要:
Cells with an alteration at least in the gene involved in betaine catabolism, their preparation and their use, in particular for producing metabolites and/or enzymes, are disclosed.