摘要:
A method for producing human leukocyte interferon alpha-2 resides in that there is carried out submerged cultivation of a producer strain Pseudomonas species VG-84 carrying a plasmid pVG3 with an inserted gene of human leukocyte interferon alpha-2, said strain being deposited in the collection of microorganism cultures at the USSR Antibiotics Research Institute under Reg. No. 1742; said strain being cultivated in a nutrient medium, containing the sources of carbon and nitrogen, mineral salts and growth stimulants, under aeration in the presence of antibiotics, i.e., streptomycin or tetracycline, or a mixture of both, followed by isolation and purification of the end product.
摘要:
A recombinant plasmid DVA pVN22 coding the biosynthesis of a human leukocyte interferon .alpha.-I1 having size of 10.85 t.p.b. and consisting of the following units:EcoRI--HindIII--a fragment of the plasmid pAYC37 with the size of 9.45 t.p.b.,HindIII--EcoRI--a fragment with the size of 1.4 t.p.b. consisting of the following members:a fragment of DNA with the size of 0.25 t.p.b. with the regulatory range of gene D of the phague .phi..times.174 and the first codons of the gene of interferongene of interferon .alpha.-I1 with the size of 0.5 t.p.b.,a region of the human genome DNA with the size of 0.65 t.p.b.;it has the following genetic markers: genome Ap.sup.R ensuring resistance against ampicillin, genome Sm.sup.R ensuring resistance to streptomycin; contains unique regions of recognition of restrictases: Hind III--O; EcoRI--1.4 t.p.b., BamHI--10.82 t.p.b., it is deposited at the collection of culture of microogranisms of the A11-Union Research Institute of Antibiotics and registered under the entry No. 1788.sup.I.A strain Pseudomonas Sp. 31 (pVN22)--producer of a human leukocyte interferon .alpha.-I1 containing a recombinant plasmid DNA pVN22 produced by the method of genetic engineering by introducing said plasmid into bacteria of the genus Pseudomonas, deposited at the collection of cultures of microoorganisms of the A11-Union Research Institute of Antibiotics on 02.04.86 and registered under the entry No. 1788A.
摘要:
A bacterial strain of Escherichia coli BKIIM B-3996, a producere of L-threonine, containing a recombinant plasmid pVIC40 and deposited on Nov. 19, 1987 in the collection of microorganism cultures at the USSR Antibiotics Research Institute under Reg. No. 1867.
摘要:
A bacterial strain of Escherichia coli BKIIM B-3996, a producer of L-threonine, containing a recombinant plasmid pVIC40 and deposited on Nov. 19, 1987 in the collection of microorganism cultures at the USSR Antibiotics Research Institute under Reg. No. 1867.
摘要:
A method for constructing strains which produce aminoacids comprising combining of a DNA chromosome fragment of a donor microorganism containing genes controlling the synthesis of a selected aminoacid and having a mutation destroying the negative regulation of the synthesis of this aminoacid with a vector DNA molecule to form a hybrid DNA molecule. Use is made of a vector DNA molecule capable of providing amplification of the hybrid DNA molecule. The resulting hybrid DNA molecule is used for transforming cells of the recipient strain having the mutation blocking the synthesis of the selected aminoacid in this strain and the mutation partly blocking the related step of metabolism of this aminoacid to yield the strain capable of increased productivity of the selected aminoacid.
摘要:
A bacterial strain of Escherichia coli VNII genetika 472T23, a producer of L-threonine, containing the plasmid PYN7 and a plasmid-free variant of E. coli; strain VNII genetika 472T23, deposited at the American Type Culture Collection under Accesion No. ATCC 98081 and 98082, respectively.
摘要:
The process for producing L-threonine consists in that there is cultivated a producer of L-threonine in the capacity of which is used the Escherichia coli strain VNIIgenetika M-1 deposited in the Central museum of commercial microorganisms under the All-Union Research Institute for Genetics and Selection of Commercial Microorganisms at a registration No. IIMIIB-1856. The above strain has been selected on the basis of natural variability of the Escherichia coli strain VNIIgenetika VL 334/p YN7), obtained by virtue of the genetic engineering techniques through increasing the dose of mutant genes capable of a higher rate of L-threonine production, by introducing a multicopy hydrid plasmid carrying said genes, into a mutant recipient strain. The abovesaid producer is cultivated on a nutrient medium, containing sources of carbon, nitrogen, and some mineral salts in the presence of an antibiotic penicillin, the resultant biomass being then separated from the culture fluid, whereupon the end product is isolated.