摘要:
The present invention relates to host cells transformed with a nucleic acid sequence encoding a eukaryotic xylose isomerase obtainable from an anaerobic fungus. When expressed, the sequence encoding the xylose isomerase confers to the host cell the ability to convert xylose to xylulose which may be further metabolized by the host cell. Thus, the host cell is capable of growth on xylose as carbon source. The host cell preferably is a eukaryotic microorganism such as a yeast or a filamentous fungus. The invention further relates to processes for the production of fermentation products such as ethanol, in which a host cell of the invention uses xylose for growth and for the production of the fermentation product. The invention further relates to nucleic acid sequences encoding eukaryotic xylose isomerases and xylulose kinases as obtainable from anaerobic fungi.
摘要:
The present invention relates to a cell suitable for production of one or more fermentation product from a sugar composition comprising glucose, galactose, arabinose and xylose, wherein the cell comprises two to fifteen copies of one or more xylose isomerase gene or two to fifteen copies of one or more xylose reductase and xylitol dehydrogenase, and two to ten copies of araA, araB and araD, genes, wherein these genes are integrated into the cell genome.
摘要:
A mutant hydroxylase with increased activity and greater substrate specificity towards phenylacetyl-7-ADCA derivatives for the production of phenylacetyl-7-HACA derivatives, which carries one or more amino acid modification at residue positions when compared with certain wild type hydroxylase from certain groups of residues. Also disclosed is a process for the preparation of deacetyl cephalosporanic acid from the corresponding deacetoxy cephalosporanic acid that includes an enzyme of the present invention. Also provided is a method for the production and processing of such enzymes.
摘要:
The invention relates to a process for the preparation of a fermentation product from ligno-cellulosic material, comprising the following steps: a) optionally pre-treatment of the ligno-cellulosic material; b) optionally washing of the optionally pre-treated ligno-cellulosic material; c) enzymatic hydrolysis of the optionally washed and/or optionally pre-treated ligno-cellulosic material using an enzyme composition comprising at least two cellulase and whereby the enzyme composition at least comprises GH61; d) whereby less than 7.5 mg enzyme composition/g glucan (on dry matter and enzyme as protein) or less than 3.0 mg enzyme composition/g feedstock (on dry matter and enzyme as protein) is used; and e) fermentation of the hydrolysed ligno-cellulosic material to produce a fermentation product; and f) optionally recovery of a fermentation product; wherein before and/or during the enzymatic hydrolysis oxygen is added to the ligno-cellulosic material.
摘要:
An object to be achieved by the present invention is to culture a filamentous fungus at a high density, thereby enabling mass production of a useful substance. The present invention provides a method of producing a substance, including the steps of: culturing a mutant filamentous fungus with no expression of α-1,3-glucan to allow the filamentous fungus to produce a substance; and collecting the resulting substance.
摘要:
The present invention relates to host cells transformed with a nucleic acid sequence encoding a eukaryotic xylose isomerase obtainable from an anaerobic fungus. When expressed, the sequence encoding the xylose isomerase confers to the host cell the ability to convert xylose to xylulose which may be further metabolized by the host cell. Thus, the host cell is capable of growth on xylose as carbon source. The host cell preferably is a eukaryotic microorganism such as a yeast or a filamentous fungus. The invention further relates to processes for the production of fermentation products such as ethanol, in which a host cell of the invention uses xylose for growth and for the production of the fermentation product. The invention further relates to nucleic acid sequences encoding eukaryotic xylose isomerases and xylulose kinases as obtainable from anaerobic fungi.
摘要:
The invention relates to a process for the production of cells which are capable of converting arabinose, comprising the following steps: a) Introducing into a host strain that cannot convert arabinose, the genes AraA, araB and araD, this cell is designated as constructed cell; b) Subjecting the constructed cell to adaptive evolution until a cell that converts arabinose is obtained, c) Optionally, subjecting the first arabinose converting cell to adaptive evolution to improve the arabinose conversion; the cell produced in step b) or c) is designated as first arabinose converting cell; d) Analysing the full genome or part of the genome of the first arabinose converting cell and that of the constructed cell; e) Identifying single nucleotide polymorphisms (SNP's) in the first arabinose converting cell; and f) Using the information of the SNP's in rational design of a cell capable of converting arabinose; g) Construction of the cell capable of converting arabinose designed in step f).
摘要:
The present invention relates to host cells transformed with a nucleic acid sequence encoding a eukaryotic xylose isomerase obtainable from an anaerobic fungus. When expressed, the sequence encoding the xylose isomerase confers to the host cell the ability to convert xylose to xylulose which may be further metabolized by the host cell. Thus, the host cell is capable of growth on xylose as carbon source. The host cell preferably is a eukaryotic microorganism such as a yeast or a filamentous fungus. The invention further relates to processes for the production of fermentation products such as ethanol, in which a host cell of the invention uses xylose for growth and for the production of the fermentation product. The invention further relates to nucleic acid sequences encoding eukaryotic xylose isomerases and xylulose kinases as obtainable from anaerobic fungi.
摘要:
The present invention encompasses isolated gene regulatory elements and gene transcription terminators that are differentially expressed in a native fungus exhibiting a first morphology relative to the native fungus exhibiting a second morphology. The invention also encompasses a method of utilizing a fungus for protein or chemical production. A transformed fungus is produced by transforming a fungus with a recombinant polynucleotide molecule. The recombinant polynucleotide molecule contains an isolated polynucleotide sequence linked operably to another molecule comprising a coding region of a gene of interest. The gene regulatory element and gene transcription terminator may temporally and spatially regulate expression of particular genes for optimum production of compounds of interest in a transgenic fungus.
摘要:
The invention relates to a method for producing isotopically labelled secondary metabolic products of fungi or bacteria in a liquid synthetic culture medium. According to said method, the synthesis is carried out by immobilizing the fungi or bacteria on an inert carrier, adding a liquid synthetic culture medium in which essentially all of the carbon atoms, nitrogen atoms and/or sulphur atoms are replaced by stable isotopes.