摘要:
Novel and efficient methods for preparing Penicillium transformants are provided employing DNA constructs having a structural gene complementing an auxotrophic host and, preferably, the ans gene. Conditions are provided for frequency of transformation. I
摘要:
Novel vectors are disclosed for expressing and secreting heterologous polypeptides from filamentous fungi. Such vectors are used in novel processes to express and secrete such heterologous polypeptides. The vectors used for transforming a filamentous fungus to express and secrete a heterologous polypeptide include a DNA sequence encoding a heterologous polypeptide and a DNA sequence encoding a signal sequence which is functional in a secretory system in a given filamentous fungus and which is operably linked to the sequence encoding the heterologous polypeptide. Such signal sequences may be the signal sequence normally associated with the heterologous polypeptides or may be derived from other sources. The vector may also contain DNA sequences encoding a promoter sequence which is functionally recognized by the filamentous fungus and which is operably linked to the DNA sequence encoding the signal sequence. Preferably functional polyadenylation sequences are operably linked to the 3′ terminus of the DNA sequence encoding the heterologous polypeptides. Each of the above described vectors are used in novel processes to transform a filamentous fungus wherein the DNA sequences encoding the signal sequence and heterologous polypeptide are expressed. The thus synthesized polypeptide is thereafter secreted from the filamentous fungus.
摘要:
he present invention provides plasmids suitable as vector systems for filamentous fungi, especially antibiotic-producing filamentous fungi such as antibiotic-producing strains of Acremonium chrysogenum or Penicillium chrysogenum, comprising an autonomous replication sequence which is effective in the intended host, an activator sequence derived from, or copied from, DNA of the intended host and/or one or more other fungi of the same species, and a fungal selectable protein-coding element, transcription of which is directed by the activator sequence.
摘要:
a-Aryloxypropionic acids and derivatives of formula I below are stereospecifically inverted by contact with a microorganism having a stereospecific inverting enzyme system or with that enzyme system at least partially extracted from the microorganism. This process enables the [S] enantiomer of the compound of formula I: Arthrobacter simplex (NCIB 8929); Bacillus thuringensis (NCIB 11992); Leuconostoc dextranicum (NCIB 2706); Lactobacillus plantarum (NCIB 6105); Proteus vulgaris (NCIB 67) Streptomyces sp. (NCIB 10105); Streptomyces venezuelae (ATCC 15439) and Penicillium sp. (IMI 287163). wherein G is OR' or R' is hydrogen or a protecting group and R 2 is hydrogen or methyl, U and V each independently represent hydrogen or halogen, and R is a carboxyl group, or an enzymic equivalent thereof to be converted to the corresponding [R) enantiomer which is a useful intermediate for making the active [R] enantiomer of many herbicides. Specific microorganisms which effect the inversion are:
摘要:
s A process for preparing a substrate suitable for cell cultivation thereon, comprises subjecting cotton to mechanical attrition in the presence of water, and shredding the hydrated cotton. The shredded cotton can be mixed with nutrient, sterilised and used as a mushroom spawn growth or cultivation substrate.
摘要:
A method of controlling field bindweed plants in agricultural crops which comprises applying to the plants or to the locus of the plants an effective amount of the fungus Phomopsis convolvulus to effect and produce typical lesions in the bindweed plants so as to inhibit the growth of or kill the bindweed plants. A plant growth regulating composition comprising a plant growth regulating effective amount of a culture of microorganisms of the species Phomopsis convolvulus in association with an agriculturally acceptable carrier. A biologically pure culture of the fungal microorganism having the identifying characteristics of Phomopsis convolvulus IMI 312959.
摘要:
A process for the improved culturing of filamentous basidiomycete fungi is provided. The improvement lies in adding to the culture medium a polymer additive which reduces the aggregation of the filaments of fungi. Preferred polymer additives are polyacrylate and polymethacrylate thickening agents.
摘要:
Cellulase may be prepared in good yield and at relatively low cost by culturing certain mutant strains of the genus Trichoderma, which exhibit increased inducibility of cellulase by L-sorbose, in medium wherein the carbon source comprises cellulose-containing material of plant origin, for example, bagasses, waste papers, rice plant hulls and straws or soybean wastes. Preferred mutant strains are exemplified by Trichoderma reesei PC-1-4, PC-3-7, X-30 and X-31.
摘要:
Saure Proteasen mit breitem Wirkungsspektrum werden in hohen Ausbeuten von selektierten Aspergillus-Mutanten erhalten. Für die Selektion geht man von einem Wildstamm aus, bevorzugt Aspergillus niger var. Thienhem CBS 319.81, der extrazelluläre saure Protease bildet. Die Mutierung erfolgt vorzugweise durch UV-Bestrahlung. Mutanten mit erhöhter proteolytischer Aktivität lassen sich selektieren, indem man sie auf Caseinatagarplatten ausspatelt, dem Agarmedium einen Inhibitor für Carboxylprotease, bevorzugt Pepstatin, zugibt, bebrütet und Mutantenkolonien mit verstarkter caseinolytischer Hofbildung isoliert. Beansprucht werden die Mutanten Aspergillus niger AP 114-III-69 bzw. -IV-70, -74, und -80 mit den Hinterlegungsnummern CBS 320.81; 321.81, 322.81 und 323.81, sowie der aus Boden isolierte Wildstamm Aspergillus niger var. Tienhem AP 114 (CBS 319.81) sowie die Verwendung der daraus gewonnen Protease als Tierfutterzusatz.