IPC classes for russian patent Bacillus licheniformis strain having apparent antagonism in relation to salmonella typhi, staphyloccus aureus, listeria monocytogenes and resistance to streptomycin and nalidixic acid. RU patent 2501851. (RU 2501851):
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FIELD: biotechnologies.
SUBSTANCE: Bacillus licheniformis strain has antagonism in relation to Salmonella typhi, Staphylococcus aureus, Listeria monocytogenes and resistance to the following antibiotics: streptomycin and nalidixic acid. The strain is deposited with number BKM B-2712D in the All- Russian collection of microorganisms of the Institute of Biochemistry and Physiology of Microorganisms of the Russian Academy of Science (IBFM RAN).
EFFECT: strain can be used for creation of probiotic bacterial preparations in veterinary.
The invention refers to biotechnology, namely to the probiotic bacterial drugs that can find application in veterinary medicine.
Probiotic bacterial preparations based on strains of microorganisms possessing antagonistic activity to bacteria.
Classical studies I.A. Mechnikov these properties were studied on the example of lactic acid bacteria. Then the circle of producers of probiotic preparations was expanded.
Probiotics based on strains of spore-forming bacteria relatively recently started to be used in veterinary medicine. Antagonistic properties of these bacteria have drawn attention of many developers
The complexity of the treatment of infectious diseases consists of the emergence of pathogenic microorganisms to antibiotics. Moreover, antibiotics often have spillover effects on the organism of the animals and cause intestinal dysbacteriosis course of the basic disease. It causes the necessity of search of new approaches to solving this problem.
Drugs-probiotics on the basis of bacteria of the genus Bacillus, which suppress the development of pathogenic microorganisms are widely used in agriculture for the suppression of phytopathogenic bacteria and fungi, medicine, veterinary medicine for treatment of different diseases of birds and farm animals [1].
Currently drugs-probiotics from bacteria of the genus Bacillus, are widely used in veterinary medicine for treatment of various diseases of birds and farm animals. Offered numerous variants of probiotics of spore-forming bacteria: [5], [6], [7], sporobacterin [8], [9]. The basis of the above drugs-probiotics are different strains of bacteria of the genus Bacillus, having antagonism against pathogenic bacteria.
To increase the efficiency of the prevention and treatment of disbacteriosis offer drugs of two strains of bacteria of the genus Bacillus Bacillus subtilis and Bacillus licheniformis. It is believed that the type of bacteria Bacillus subtilis - strict aerobes, while representatives of Bacillus licheniformis can grow in conditions. It is also believed that these properties of the two types strengthen the effectiveness of probiotic treatment [2-4]. The vast majority of the members of the genus Bacillus harmless for warm-blooded animals, are antagonistic activity towards a wide spectrum of pathogenic and conditionally pathogenic microorganisms resistant to political enzymes and their application in production, stable in storage, is ecologically safe.
Given the possibility of the use of antibiotics in feed production, is very promising use of probiotic preparations strains possessing both high antagonistic activity against and MDR antibiotics.
As a prototype can be seen strain of Bacillus licheniformis PMBC-2336, part of a veterinary drug [11].
Object of the present invention is to obtain a strain of Bacillus licheniformis having antagonistic activity towards a wide spectrum of pathogenic test-organisms, as well as resistance to the most commonly used antibiotics.
Technical effect which can be obtained by using the resulting strain, is to enhance the effectiveness of treatment due to the possibility of a simultaneous application of bacterial preparation of antibiotics.
To solve this problem, a strain of Bacillus licheniformis VKM B-2712D. Strain deposited in the national collection of microorganisms.
Identification strain was carried out by « microorganisms» Berga (1997).
The original soil isolates selected in the Kirov region. Soil isolate was subjected to impact nitrozoguanidine mutagenesis (dose of 40 to 100 mcg/ml) with subsequent screening on selective media.
Culturally-morphological and microscopic features of strain: the rod-shaped cells direct, size: 0,5-0,7 x to 2.0-3.0 mm, heat-resistant forms endospores, no more than 1 in a cage sporangia, , not suppressed, by exposure to air, the location is Central. Cells are immobile. The standard nutritionally dense environments (MPA, LB, GRM-1) forms small transparent convex colonies. Colonies grow into the agar. Catalase: _, optional . Sources of carbon aerobic growth: glucose, arabinose, xylose, lures, dextrose, casein, starch. The optimum pH for the growth of 6.0-8.0, the temperature is from +4 degrees C to +45 C.
Antibiotic resistance: streptomycin -10 mcg/ml, nalidiksova acid -20 mcg/ml.
The invention is illustrated by the following examples.
Example 1. Strain is characterized by high antagonistic activity against pathogenic and conditionally pathogenic microorganisms. Antagonistic activity tested method of deferred antagonism.
For this suspension cells, washed out from the agar medium, plant touch on diameter of a Petri dish with agar medium Gause N 2. Crops were incubated in thermostat at 37 C for 48 H. Then, which has grown culture stroke test-organisms (500-million suspension subsistence crops in the physiological solution). Records of the results of conducted through 18-20 hours of incubation at 37 C largest areas lack of growth in the test cultures. The control of the growth of test cultures served parallel growing them in cups with an agar medium Gause N 2 without the studied culture. The results are shown in the table.
Study of antagonistic properties culture
Growth inhibition test cultures, mm E. coli
S. typhimurium S. typhi
Ps. aeruginosa
St. aureus
L. monocytogenes 0 0 8 0 13 15
Example 2. It studied the resistance to the following antibiotics: kanamycin, streptomycin, gentamicin, trimethoprim, nalidixic acid, Cefazolin, ampicillin, benzylpenicillin sodium salt. A check was carried out at the deep cultivation producer on glucose peptone medium with yeast extract at various concentrations of antibiotics. It was found that the strain has to antibiotic resistance: streptomycin - 10 mcg/ml, nalidiksova acid - 20 mcg/ml
Example 3.
The enzyme activity in the cultural liquid determined in submerged cultivation producer on glucose peptone medium with yeast extract in two days. The following were identified values of enzymatic activity:
α activity - 0.1 U/ml of the medium at pH 6.0, activity - 1,728 U/ml of the medium with pH 7.0.
It should be noted high activity strain Bacillus licheniformis VKM B-2712D.
Literature
1. Smirnov V.V., Reznik S.R., V.O. Modern understanding of the mechanisms of therapeutic and prophylactic action of probiotics from bacteria of the genus Bacillus // . Journe. - 1993. - №4. - Pp.92-112.
2. Bakulina L. F., Timofeyev I.V., N.G. Perminova, Polushkina A.F., NI Probiotics on the basis of spore-forming microorganisms of the genus Bacillus and their use in veterinary medicine // Biotechnology. 2001, №2, P.48-56.
3. Hong, N.A., Due L.H., Cutting with The use of bacterial spore formers as probiotics // FEMS Microbiol.Rev. - 2005. - Vol.29, N 4. - P. 813-835.
4. Probiotics Microbes: The Scientific Basis / RJ. Collier, et al. // A Report from the American Academy of Microbiology Washington, 2006. - 28 p.
5. Patent of the Russian Federation 2130316. Medical and prophylactic preparation . A61K 35/74, BI №14,1999, prior. 23.01.97.
6. USSR patent 1710575. A strain of bacteria Bacillus sp - component therapeutic and preventive preparation against dysbacteriosis and allergies, C12N 1/20, BI №5,1992.
7. Patent of the Russian Federation 2035186. Preventive biopreparation . A61K 35/66, BI №14, 1995.
8. Aleshkin, A.V., Afanasiev, S., , V.Y, Manko, so-CALLED, , I.YU Bacterial preparation of new generation «Sporobacterin» // Honey. card index. - 2003. - №4
9. Patent of Russian Federation №2035185 Preventive biopreparation . -1995 Prior. 31.01.1992.
10. Patent of the Russian Federation 2115725. Strain of Bacillus subtilis, resistant to rifampicin, ampicillin, and streptomycin, has activity against pathogenic species of microorganisms. Prior. 23.07.1997.
11. Gataullin A.G. Biological properties of strains of Bacillus subtilis looking to create a new probiotics // Diss. kand. Biol. of Sciences, Moscow, 2005
Strain of Bacillus licheniformis BKM B-2712D, has expressed antagonism towards Salmonella typhi, Staphylococcus aureus, Listeria monocytogenes, and resistance to antibiotics streptomycin and nalidixic acid.
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