摘要:
The present invention discloses a fermentative process for the production of penicillin G or V or cephalosporin G or V derivatives wherein certain derivatives of phenylbutyric acid are used as a side chain precursor. In said phenylbutyric acid derivatives, the acyl chain is extended by pairs of carbon atoms and certain substituents are present at the φ- and/or φ-1 position. The corresponding phenoxybutyric acid derivatives are used to produce penicillin V or cephalosporin V derivatives. Optionally, the penicillin or cephalosporin G or V compounds are deacylated to produce their deacylated counterparts.
摘要:
An method for enhancing the secretion of a β-lactam compound from a micro-organism is described, together with an isolated polynucleotide encoding the ABC transporter protein responsible for said enhanced secretion. Furthermore an isolated poylnucleotide encoding an ABC transporter is claimed. Method for producing β-lactam compounds in a micro-organism comprising the step of enhancing ABC-transporter activity of said micro-organism and subsequently culturing said micro-organism under conditions allowing the production of said β-lactam compounds is also disclosed.
摘要:
The present invention relates to a method for modulating the production of secondary metabolites in the fungus Penicillium chrysogenum by influencing the homeostasis of organelles by modulating a least one gene which is directly related to organelle homeostasis in this fungus. Preferably, the organelle homeostasis is modulated by genetically engineering at least one gene encoding a protein which is responsible for organelle biogenesis (the expression and/or activity of which is to be increased) and/or at least one gene encoding a protein which is responsible for organelle degeneration (the expression and/or activity of which is to be decreased). Genes involved in organelle biosynthesis in P. chrysogenum are exemplified by the so-called pex11 gene. Genes involved in organelle degradation are exemplified by the so-called vps15 and pdd1 genes.
摘要:
The present invention discloses a process for the production of 7-amino cephalosporanic acid (7-ACA) or a derivative thereof comprising the steps of fermenting a P. chrysogenum strain being transformed with an expression construct comprising a nucleotide sequence encoding expandase, hydroxylase and acetyltransferase activity in the presence of a suitable acyl side chain precursor, or a salt or ester thereof, such that an N-acylated 7-ACA compound is produced, N-deacylating the thus produced N-acylated 7-ACA compound and, optionally, acylating the free amino group and/or substituting the 3' acetate group with a side chain suitable to form a cephalosporin antibiotic, characterised in that the nucleotide sequence encoding the acetyltransferase is derived from Acremonium chrysogenum and starts at the second ATG of the open reading frame as present in said nucleotide sequence.
摘要:
An overall efficient process for the preparation and recovery of 7-aminodesacetoxycephalosporanic acid (7-ADCA) via 3-(carboxyethylthio)propionyl-7-ADCA, using a Penicillium chrysogenum transformant strain expressing expandase in conjunction with acyltransferase, is provided.
摘要:
The present invention discloses a process for the production of N-deacylated cephalosporin compounds via the fermentative production of their 7-acylated counterparts.
摘要:
An overall process for the preparation and recovery of 7-aminodesacetoxycephalosporanic acid (7-ADCA) via enzymatic ring expansion activity on penicillin G, using a Penicillium chrysogenum transformant strain expressing expandase.
摘要:
The invention provides DNA, heterologous host cells capable of transcribing, translating or expressing said DNA and methods employing such host cells and cultures thereof for an improved in vivo production of acylated cephalosporins with higher yield. According to the invention, a host cell is provided comprising an enzyme having expandase activity which is predominantly localised in the cytosol (as opposed to localised mainly in or with the peroxisomes or microbodies) of the host cell.
摘要:
The present invention relates to filamentous fungi that comprise in their genomes at last two substantially homologous DNA domains which are suitable for integration of one or more copies of a recombinant DNA molecule and wherein at least two of these DNA domains comprise an integrated copy of a recombinant DNA molecule. The invention also relates to methods for preparing such filamentous fungi and for further multiplying the DNA domains with integrated recombinant DNA molecules through gene conversion or amplification.