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91.
Abramov Sh. A. Kotenko S. Ts. Ramazanov A. Sh. Islamova F. I. 《Applied Biochemistry and Microbiology》2003,39(4):385-387
The qualitative and quantitative composition of water-soluble B group vitamins in Saccharomyces yeasts cultivated on various nutrient media was studied by high-performance liquid chromatography. New strains of Saccharomyces oviformis Y-2635 and Saccharomyces vini F-5, grown in a nutrient medium with geothermal water, are characterized by increased biological value due to high intracellular concentrations of riboflavin, LB, nicotinic acid, and folic acid. 相似文献
92.
Use of a dual-origin temperature-controlled amplifiable replicon for optimization of human interleukin-1 beta synthesis in Escherichia coli 总被引:1,自引:0,他引:1
S V Mashko A V Mochulsky S V Kotenko M I Lebedeva A L Lapidus N A Mochulskaya L S Izotova V P Veiko Y P Vinetsky S A Ketlinsky 《Gene》1991,97(2):259-266
A new dual-replicon recombinant plasmid, pPR53-tsr, has been constructed; it is a derivative of the expression vector pPR-TGATG-1 [Mashko et al., Gene 88 (1990) 121-126]. In contrast to its progenitor, pPR53-tsr is a low-copy-number (low-Cop) plasmid amplifiable in temperature-dependent fashion. In addition to both the replicon and the par locus from plasmid pSC101, providing segregational stability and a low Cop at 28 degrees C, the new plasmid contains a mutant ColE1 replicon whose RNAII is synthesized under the control of the pL promoter. The presence of a thermolabile repressor, cIts857, allows the thermo-inducible amplification of pPR53-tsr; the increased plasmid Cop is estimated at approx. 200 per genome 6 h after thermal induction at 42 degrees C. Thus, pPR53-tsr can be used as a donor of the thermo-inducible dual-replicon fragment for recombinant plasmids. Here, we employ such an approach for optimization of production of human interleukin-1 beta (hIL-1 beta) in Escherichia coli at a high level. The thermo-induced level of recombinant hIL-1 beta (re-hIL-1 beta) biosynthesis was around 9% of total cellular protein when the dual-replicon high-Cop vector was used. A method based on acidification of the water-soluble protein fraction to pH 4.0 has been developed that allows for the isolation of 80%-pure re-hIL-1 beta. The homogeneous material was obtained by two subsequent hydrophobic sorbent chromatographies. The protein yield ranged between 3-5 mg of re-hIL-1 beta/g of wet cells. The re-hIL-1 beta specific activity was about 2 x 10(8) units/mg, coinciding with that of the authentic hIL-1 beta. 相似文献
93.
94.
A yeast mutant valuable for the baking industry was obtained by using laser radiation. Its morphological and biochemical characteristics were studied. 相似文献