摘要:
The present invention relates to methods for monitoring differential expression of a plurality of genes in a first filamentous fungal cell relative to expression of the same genes in one or more second filamentous fungal cells using microarrays containing filamentous fungal expressed sequenced tags. The present invention also relates to filamentous fungal expressed sequenced tags and to computer readable media and substrates containing such expressed sequenced tags for monitoring expression of a plurality of genes in filamentous fungal cells.
摘要:
In a first aspect, the present invention relates to a recombinant fungal strain, capable of expressing chitin deacetylase, which includes an expression vector that contains a nucleic acid molecule encoding chitin deacetylase, a suitable promoter and a transcription terminator. In particular, the present invention provides a recombinant Aspergillus oryzae strain capable of expressing chitin deacetylase obtained from Mucor rouxii. The present invention also relates to a method for producing chitin deacetylase by a recombinant fungal strain. In a second aspect, the present invention relates to a recombinant yeast strain, capable of expressing chitin deacetylase, which includes an expression vector that contains a nucleic acid molecule encoding chitin deacetylase, a suitable promoter and a transcription terminator. In particular, the present invention provides a recombinant Pichia pastoris strain capable of expressing chitin deacetylase obtained from Mucor rouxii. The present invention also relates to a method for producing chitin deacetylase by a recombinant yeast strain. The present invention further relates to purified recombinant chitin deacetylase enzyme.
摘要:
The present invention relates to methods of producing a heterologous biological substance, comprising: (a) cultivating a mutant of a parent Aspergillus niger strain in a medium suitable for the production of the heterologous biological substance, wherein (i) the mutant strain comprises a first nucleotide sequence encoding the heterologous biological substance and one or more second nucleotide sequences comprising a modification of glaA and at least one of the genes selected from the group consisting of asa, amyA, amyB, prtT, and oah, and (ii) the mutant strain is deficient in the production of glucoamylase and at least one enzyme selected from the group consisting of acid stable alpha-amylase, neutral alpha-amylase A, and neutral alpha-amylase B, protease, and oxalic acid hydrolase compared to the parent Aspergillus niger strain when cultivated under identical conditions; and (b) recovering the heterologous biological substance from the cultivation medium. The present invention also relates to enzyme-deficient mutants of Aspergillus niger strains and methods for producing such mutants.
摘要:
Preventive and therapeutic agents against the HIV virus and pathogenic bacteria, comprising the active ingredients obtained from hyphae of Kabanoanatake nullscientific name: Fuscoia obliqua (Fr.) Aoshimanull. The said active ingredients have potent inhibitory effects and therapeutic effects on HIV, even in very small amounts. The said active ingredients also have potent inhibitory effects on Bacillus coli, and other pathogenic bacteria. The present invention offers culture methods which enable the supply of active ingredients having potent anti-HIV activity and other physiological activity, by artificial culture of such Kabanoanatake on a large scale.
摘要:
A novel tyrosine-inducible tyrosine ammonia lyase enzyme was isolated from the yeast Trichosporon cutaneum. This enzyme has a higher activity for tyrosine than for phenylalanine and is useful for the production of para-hydroxycinnamic acid directly from tyrosine. The gene encoding this enzyme was sequenced using 3null and 5null RACE cloning of the TAL cDNA and the gene was expressed in the yeast Saccharomyces cerevisiae and in the bacterium Escherichia coli.
摘要:
The invention relates to a method for the production of xylitol, the method comprising (a1) providing (i) a microorganism having xylanolytic activity, and (ii) a microorganism capable of converting a pentose sugar to xylitol; or (a2) providing a microorganism having xylanolytic activity and being capable of converting a pentose sugar to xylitol, (b) culturing the microorganism of step (al) (i) or the microorganism of step (a2) in a medium comprising polymer or oligomer materials containing pentose sugars in conditions sufficient for enabling hydrolysis of said polymers or oligomers by the microorganism; (c) producing xylitol in the microorganism of step (a1) (ii) or in the microorganism of step (a2) by bioconversion of the hydrolysis products obtained in step (b), and (d) recovering said xylitol produced. The invention also relates to a microorganism, which has xylanolytic activity and has been genetically modified (i) to enhance its xylanolytic activity, and (ii) to reduce its xylitol metabolism.
摘要:
The present invention relates to methods of obtaining a mutant cell from a filamentous fungal parent cell, comprising: (a) obtaining mutant cells of the parent cell; (b) identifying the mutant cell which exhibits a more restricted colonial phenotype and/or a more extensive hyphal branching than the parent cell; and (c) identifying the mutant cell which has an improved property for production of a heterologous polypeptide than the parent cell, when the mutant and parent cells are cultured under the same conditions.
摘要:
The present invention relates to novel variant EGIII or EGIII-like cellulases that have improved stability. The variant cellulases have performance sensitive residues replaced to a residue having modified stability.
摘要:
The present invention provides methods and compositions that enable the experimental determination as to whether any gene in the genome of a diploid pathogenic organism is essential, and whether it is required for virulence or pathogenicity. The methods involve the construction of genetic mutants in which one allele of a specific gene is inactivated while the other allele of the gene is placed under conditional expression. The identification of essential genes and those genes critical to the development of virulent infections, provides a basis for the development of screens for new drugs against such pathogenic organisms. The present invention further provides Candida albicans genes that are demonstrated to be essential and are potential targets for drug screening. The nucleotide sequence of the target genes can be used for various drug discovery purposes, such as expression of the recombinant protein, hybridization assay and construction of nucleic acid arrays. The uses of proteins encoded by the essential genes, and genetically engineered cells comprising modified alleles of essential genes in various screening methods are also encompassed by the invention.