WO2001021808A2 - Bacteries lactiques transformees pour leur conferer un metabolisme respiratoire - Google Patents
Bacteries lactiques transformees pour leur conferer un metabolisme respiratoire Download PDFInfo
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- WO2001021808A2 WO2001021808A2 PCT/FR2000/002611 FR0002611W WO0121808A2 WO 2001021808 A2 WO2001021808 A2 WO 2001021808A2 FR 0002611 W FR0002611 W FR 0002611W WO 0121808 A2 WO0121808 A2 WO 0121808A2
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- lactic acid
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- acid bacteria
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
- A23C2220/00—Biochemical treatment
- A23C2220/20—Treatment with microorganisms
- A23C2220/202—Genetic engineering of microorganisms used in dairy technology
Definitions
- the present invention relates to the improvement of the preservation and acidification properties of lactic starter cultures.
- lactic sourdough any preparation intended for sowing a medium to be fermented, and comprising at least one strain of lactic acid bacteria belonging in particular to one of the genera Lactococcus, Streptococcus, Enterococcus, Leuconostoc, Lactobacillus, Propionibacteria , or Bifidobacteria, or a mixture of strains belonging to one or more of the genera mentioned above.
- the lactic acid starter used in particular to produce fermented foods and silage products are usually prepared in batch culture, and are then concentrated and packaged for later use in order to inoculate different food products for fermentation.
- One of the concerns of the producers of sourdoughs is to obtain a high bacterial biomass, and to maintain a good viability of the bacteria during storage so that, during inoculation, the fermentation starts quickly and gives food products having characteristics. reproducible.
- culture media buffered around pH 6 with cations associated with carbonates, hydroxides, phosphates or oxides are usually used for the production of sourdoughs of lactic acid bacteria.
- these additions to the culture medium can cause problems for subsequent productions, for example by promoting the development of phages, or by increasing the solubility of caseins.
- the preparation and storage of sourdoughs is usually carried out anaerobically; for example, during the preparation of starter cultures in batches, certain steps are carried out under nitrogen, in order to remove traces of oxygen.
- certain steps are carried out under nitrogen, in order to remove traces of oxygen.
- they are frequently exposed to high levels of oxygen.
- the milk that is used for the preparation of fermented milk products is highly aerated during the transfer process and therefore rich in oxygen. This could be a cause of slower restarting of the leaven.
- the inventors have now shown that the improvements in bacterial yield and viability during storage are due to the acquisition of respiratory metabolism by L. lactis during culture under aeration and in the presence of a porphyritic compound. During the inoculation of the product to be fermented, the bacteria are also capable of immediately restoring a fermentative metabolism, which results in an increase in restarting performance.
- Respiratory metabolism requires the presence of enzyme equipment involved in different metabolic pathways, including synthesis and the use of heme, the synthesis of cytochromes, and probably the synthesis of at least part of the cycle of t ⁇ carboxylic acids (Krebs cycle).
- the inventors' results demonstrate in particular that the lactic acid bacteria, represented by L. lactis, have the capacity to grow via a fermentative or respiratory mechanism.
- the growth mode depends on the culture conditions, but also on the signals transmitted by the cell itself.
- the metabolism seems rather fermentative at the beginning of growth, then becomes respiratory once the bacteria are in late exponential growth.
- the inventors have further hypothesized that there is a regulation of this transition exerted by the bacteria, and that an alteration of this regulation, effected by mactivation or by the overexpression of a regulatory gene which controls the transition between fermentative and respiratory growth, can result in more efficient breathing.
- the object of the present invention is to provide means of conferring a respiratory metabolism on lactic acid bacteria, or of promoting it, in particular in order to improve the performance of lactic starter cultures in a manner comparable to that observed previously during the addition of 'heme (or other molecules derived from porphynnes).
- this object can be achieved by causing or promoting the expression, in a lactic acid bacterium of at least one protein participating in this metabolism, by modifying the genomic profile of the lactic acid bacteria, or by transferring to a lactic acid bacteria one or more of the genes of respiratory metabolism, cloned from an aerobic bacterium, either by inactivating or overexpressing a gene of the initial bacteria, in order to switch metabolism towards the respiratory tract.
- the present invention relates to a lactic acid bacterium genetically modified in order to confer on it a respiratory metabolism, or to activate said metabolism.
- a modification resulting from the addition of at least one gene encoding or promoting a protein involved in respiratory metabolism can be obtained by transforming said lactic acid bacterium with at least one heterologous gene (i.e. gene which is not naturally present in said bacteria), involved in respiratory metabolism. It may in particular be a gene derived from an aerobic bacterium and involved in respiratory metabolism. Said gene can in particular be chosen from:
- a modification resulting in the over-activation of a protein intervening in the respiratory metabolism or promoting it can for example be obtained by introduction, in the gene coding for this protein, of a mutation resulting in a more active protein.
- a modification resulting in the overexpression of at least one gene coding for a protein involved in respiratory metabolism, or promoting it can for example be obtained by transforming said lactic acid bacterium with at least one additional copy of said gene, and / or by acting on the cis or trans regulation of this gene, for example by placing said gene under the control of expression regulation elements allowing greater expression (for example strong promoter, constitutive promoter, transcription enhancer, etc.) and / or by inactivating negative regulation elements of expression associated with said gene (for example repressor, attenuator, etc.).
- a modification resulting in the maccivation, total or partial, of at least one gene coding for a protein intervening in the fermentative metabolism, or promoting it, can be obtained in particular by deletion of all or part of said gene, or by introduction of a mutation resulting in the production of a less active or inactive protein.
- a modification resulting in the under-expression of at least one gene coding for a protein involved in fermentation metabolism, or promoting it can for example be obtained by acting on the cis or trans regulation of this gene, for example by placing said gene under the control of elements for the negative regulation of expression (for example repressor, attenuator, etc.) and / or by partially or totally inactivating the elements for the positive regulation of expression (for example promoter, enhancer of transcription, etc.) associated with said gene, or by making this expression mutable.
- elements for the negative regulation of expression for example repressor, attenuator, etc.
- partially or totally inactivating the elements for the positive regulation of expression for example promoter, enhancer of transcription, etc.
- activation or overexpression of a gene coding for a protein intervening in respiratory metabolism or favoring it, there may be mentioned in particular: an activation of one or more genes intervening in assimilation of heme, or a modification increasing the expression of said gene (s) and / or making it constitutive.
- the switching between a fermentative metabolism and a respiratory metabolism can be controlled by modification of the oxygen content of the culture medium and by the presence of heme.
- Non-limiting examples of mactivation or under-expression of genes coding for proteins involved in fermentation metabolism, or promoting it are in particular: an activation of the ccpA gene, or a modification which attenuates its expression or makes it inducible.
- the ccpA gene regulates the expression of several genes involved in the catabolism of sugars [LUESINK et al. , Molecular Microbiology 30: 789-798, (1998)].
- the inventors have hypothesized that its mactivation could promote the expression of the genes necessary for respiration.
- said lactic acid bacterium is chosen from bacteria of the genera Lactococcus, Streptococcus, Enterococcus, Leuconostoc, Lactobacillus, Propionibacteria, or Bifidobacteria.
- Preferred bacteria are those of the various species of the genus Lactococcus, as well as streptococci of the species Streptococcus thermophilus.
- the gene (s) suitable for conferring on bacteria all or part of the enzymatic equipment necessary for acquiring a respiratory metabolism or for improving respiration may be for certain genes identified by a person skilled in the art from the information on the sequences of the bacterial genomes available on the databases, which makes it possible to identify the genes already present in a given microorganism and the metabolic pathways in which these genes may participate.
- the sequence (s) of one or more neighboring species is (are) usable (s) to determine which genes are probably present
- streptococcus Streptococcus mutans and Enterococcus [previously Streptococcus] faecalis
- Other gram-positive bacteria are currently available, and reveal the presence of several of the genes required for respiration.
- streptococcus mutans and Enterococcus [previously Streptococcus] faecalis are currently available, and reveal the presence of several of the genes required for respiration.
- These species are quite phylogenetically close to lactic bacteria commonly used in the food industry such as thermophilic streptococci, and are also related to lactococci.
- the transformation of bacteria of the species Lactococcus or Streptococcus by one or more gene (s) coding for one or more protein (s) of the heme biosynthesis pathway can make it possible to obtain bacteria having a respiratory metabolism without the need to add porphyry derivatives to the culture medium.
- the desired genes can be obtained from a strict aerobic bacteria, or from an optional aerobic bacteria. They can easily be identified from the bacterial genomes available on the databases. For example, one can use genes obtained from Bacillus subtilis, which is an aerobic bacterium, and whose complete genomic sequence has been published.
- a lactic acid bacterium possessing all the genes encoding the proteins of the Krebs cycle and all the genes of the cytochromes, but devoid of all or part of the genes of the heme biosynthesis pathway; switching from a fermentative metabolism to a respiratory metabolism will then require, in addition to aeration of the medium, the addition of heme or one of its precursors.
- the desired gene (s) can be introduced separately, or at least part of them can be grouped into one or more operons ( s).
- one or two of the heme operons from B can be transferred to L. lactis. subtili s or just some of the genes present on these operons.
- lactic acid bacteria in accordance with the invention it is also possible to promote the expression of genes involved in the respiratory metabolism naturally already present in said bacteria. This can be done for example by acting on the cis or trans regulation of the activity of these genes.
- the lactic acid bacteria in accordance with the invention may also comprise other modifications, in particular the introduction of one or more nucleic acid sequences allowing them to produce substances of interest.
- Lactic acid bacteria according to the invention can be obtained by implementing conventional techniques of genetic engineering, known in themselves to those skilled in the art.
- the desired gene or genes can be associated with functional transcription and translation control sequences in the lactic acid bacteria which it is desired to transform.
- the constructs produced are placed in an appropriate vector to introduce them into the lactic acid bacteria concerned.
- Vectors which can be used to transform lactic acid bacteria of different species, and which make it possible either to maintain the genetic information introduced in the form of a stable independent replicon, or to integrate it into the bacterial chromosome, are known in themselves.
- Integration into the bacterial chromosome can in particular be carried out by transposition, or by a method of replacement of genes by homologous recombination, according to methods known in themselves to those skilled in the art.
- methods known in themselves to those skilled in the art By way of nonlimiting examples of usable methods and vectors allowing the implementation of these methods, mention will be made in particular of the methods and vectors described in PCT application WO 93/18164 in the name of INRA.
- techniques of protoplast fusion or bacterial conjugation can be used.
- Lactic acid bacteria according to the invention can also be produced by selection of mutants, natural or obtained by random mutagenesis, in which the activity and / or the expression of a protein intervening in the fermentative metabolism, or promoting it, is reduced or nonexistent, or the selection of mutants in which the activity and / or expression of a protein involved in respiratory metabolism is increased.
- the functioning of the respiratory metabolism in the modified bacterium according to the invention can be verified by carrying out the culture of said bacterium under conditions allowing the induction of a respiratory metabolism (that is to say under aeration, and possibly under conditions of induction of one or more mductible promoters optionally controlling the expression of one or more of the transferred genes and / or in the presence of heme or one of its precursors in the case where the transformed bacterium does not include the all the genes of the heme biosynthesis pathway, etc.), and by measuring the following parameters: i) the pH of the final culture, n) the products consumed or formed during the duration of the culture (for example l oxygen consumed, the production of fumarate or that of lactate, the amount of total carbon at the end of culture, which makes it possible in particular to evaluate the production of C0 2 during respiration, etc.), m) the population Bacterial ion at the end of growth, iv) survival during long storage, and v) re-acidification properties when the transformed strain is
- the present invention also relates to a process for the cultivation of lactic acid bacteria, characterized in that it comprises the culture of at least one strain of lactic acid bacteria according to the invention under conditions allowing the induction of a respiratory metabolism in said strain.
- Said conditions for induction of respiratory metabolism include aeration of the culture; advantageously, this aeration is carried out so as to maintain, throughout the duration of the culture, an oxygen supply equal to at least 5 millimoles per liter of culture medium.
- said conditions of induction of respiratory metabolism may also include the addition of a porphyric derivative in the culture medium, as described in Application PCT / IB99 / 01430.
- the strains of lactic acid bacteria according to the invention can be used for obtaining lactic starter cultures.
- the process according to the invention further comprises the harvesting of the bacteria at the end of said culture, and optionally, their conditioning and their preservation, by any appropriate means.
- the bacteria can be harvested by any means known in themselves; one can for example distribute the culture in suitable packaging and keep it in this form until use; generally, however, it is preferable to separate the bacteria from the culture medium and to concentrate them by centrifugation or by filtration. The collected bacteria can then be packaged for storage.
- the present invention also includes lactic sourdoughs comprising at least one strain of modified lactic acid bacteria according to the invention, and in particular leaveners capable of being obtained by the process according to the invention. These leaven can also include one or more other bacterial strains, of the same species or of different species. Several species or several different strains may have been cultivated simultaneously (if their optimal growth conditions are compatible), or else cultivated separately and brought together after harvest.
- the lactic starters in accordance with the invention can be harvested and stored under the same conditions as the lactic starters of the prior art, and in particular as the lactic starters which are the subject of PCT / IB99 / 01430 Application; they have conservation and restart properties at least comparable to those of the latter.
- the invention also encompasses the use of lactic starters in accordance with the invention for obtaining fermented products.
- the subject of the invention is a process for the preparation of a fermented product, characterized in that it comprises the inoculation of a medium to be fermented using a lactic acid starter in accordance with the invention.
- the invention will be further illustrated with the aid of the additional description which follows, which refers to non-limiting examples of obtaining lactic acid bacteria according to the invention.
- EXAMPLE 1 OBTAINING A STRAIN OF L. LACTIS EXPRESSING THE GENES NECESSARY TO PRODUCE PROTOHEM IX
- hewA NADP (H) genes: glutamyl-tRNA reductase, SWISS-PROT access number: P16618), hemL (GSA 2, 1-aminotransferase, SWISS-PROT access number: P30949), hemB (Porphobilinogen synthase, SWISS-PROT access number: P30950), hemC (Hydroxymethylbilane synthase, SWISS-PROT access number: P16616), hemD (Uroporphyrinogen III synthase, SWISS-PROT access number: P21248), and hemE (Uroporphyrinogen decarboxylase, SWISS-PROT access number: P32395), hemY (functions
- Bacillus subtilis allow the synthesis of protoheme IX from glutamyl-tRNA.
- the hemACDBL genes contained in a single operon in B. subtilis are amplified by PCR from the strain 3G18 (pLUG1301) [HANSSON AND HEDERSTEDT, J. Bacteriol. , 174 (24): 8081, (1992)] using primers allowing the coding sequence of the genes to be obtained with the promoter, the ribosome binding site and the terminator: Primer sense: 5 '-GGGGAGCTCGGTATTGTCAATAGGAATGC-3', Antisense primer:
- Amplification [5 min 96 ° C, (30 s. 96 ° C, 1 min. 55 ° C, 5 min 72 ° C) 30 times] is carried out with 5 units of high-fidelity Taq polymerase (Promega) in the presence of 4 mM MgC12.
- a fragment of 6500 bp is obtained. This fragment is then cloned on the plasmid pCR-TOPO (INVITROGEN) in the E. coli TOP10 strain (INVITROGEN).
- the plasmid obtained, called pTHem1 is digested with Spel and treated with DNA polymerase, a Klenow fragment, in order to obtain a blunt end.
- the plasmid pTHeml is then digested with Sac1 and the hemAXCDBL fragment is purified. It is integrated into the plasmid pIL252 previously digested with Xhol, treated with Klenow and then with Sacl [SIMON AND CHOPIN, Biochemistry, 70: 559-566, (1988)].
- the resulting plasmid called pILHeml is introduced into the strain of L. lacti s MG1363
- the hemEHY genes contained in a single operon in B. subtilis are amplified by PCR from the strain 3G18 (pLUG1301) using primers allowing the coding sequence of the genes to be obtained, with or without the promoter, with the ribosome binding site and the terminator: primer sense:
- Amplification [5 min 96 ° C, (30 s. 96 ° C, 1 min. 55 ° C, 5 min 72 ° C) 30 times] is carried out with 5 units of high-fidelity Taq polymerase (Promega) in the presence of 4 mM MgC12. A fragment of 3600 bp is obtained. This fragment turns out to be unclonable in the cloning systems used in E. coli or in L. lactis. This may be due, according to the literature, to the toxicity of the hemY gene product in E. coli. By extension, it is not excluded that HemY is also toxic in L. lacti s.
- the he EH genes contained in the hemEHY operon at B. subtilis are amplified by PCR from the strain 3G18 (pLUG1301) using primers allowing the coding sequence of the genes to be obtained with the ⁇ bosome binding site. primer meaning:
- the plasmid obtained, called pTHem is linearized by Xbal, then the ends are made blunt by the Klenow fragment of the DNA polymerase.
- the plasmid pTHem4 is then digested with ClaI and the hemEH fragment is purified. This fragment is then placed under the dependence of the promoter P ⁇ s , mductible with nisin (NICE system, patent EP0712935 by VOS and KUIPERS) on a plasmid derived from pNZ8020 previously cut with BamHI, treated with Klenow polymerase, then cut with Clal .
- the resulting plasmid called pGHeml is introduced into the strain of L.
- lactis NZ9000 containing the plasmid pILHeml The production of protoheme IX by this strain is determined as described by SHIBATA, [Methods of biochemical analysis, D. Glick (Ed.), Interscience, New York, Vol. VII, 77-109, (1959)].
- the operons hemACDBL and hemEH are used to complement corresponding mutants of B. subtilis (Bacillus Genetic Stock Center) to ensure their functionality.
- the strains obtained are tested for their capacity to breathe autonomously under aeration culture conditions, with or without hemme and by inducing the expression of the hemEH operon at nism.
- the strain used in negative control is a strain NZ9000 containing the vector plasmids alone respectively pIL252 and pGK: CmR: P ⁇ s .
- Optical density of cultures is followed at 600 nm. In aeration condition, with hemme, the DO SO o values obtained are 2.87 for the negative control and 3.23 for the strain containing the hem genes.
- EXAMPLE 2 SCREENING FOR ISOLATION OF A STRAIN OF L. LACTIS HAVING A BETTER ABILITY TO BREATHE.
- Random mutagenesis is performed on the L. lacti s MG1363 strain according to the procedure of MAGUIN et al. [J. Bacte ⁇ ol., 178: 931-935, (1996)]. Cells are spread on a box containing congo red at 30 ⁇ g / ml. The mother strain is used as a control.
- Mutants redder than the control are also isolated. These mutants, having an easier time assimilating the heme, will potentially be more able to breathe than the control.
- EXAMPLE 3 OBTAINING A STRAIN OF L. LACTIS EXPRESSING THE GENES NECESSARY TO PRODUCE QUINONES.
- vitamin B2 riboflavin
- L. lactis MG1363 increase in the biomass.
- vitamin K2 menaqumone
- This vitamin is also an essential element of the respiratory chains. Based on the chromosomal sequence of IL1403, close to MG1363, we notice that certain genes are absent compared to what is known in gram-positive bacteria (Bacillus subtilis).
- menFBytxMmenBEC comprises five genes (Bacillus Subtilis and others gram positive bacteria, Ed. Sonenshe, AL, Hoch JA and Losick R., ASM, W. DC): menF: menaqumone-specific 2 -ketoglutarate dehydrogenase, access number SWISS-PROT 23973 enD: 2-succinyl-6-hydroxy-2, 4-cyclohexadiene-l- carboxylate synthase, access number SWISS-PROT 23970 menB .- 1, 4 -dihydroxy-2 -naphtoic acid synthase, access number SWISS- PROT 23966 menE .- o-succinylbenzoic acid coenzyme A synthetase, SWISS-PROT access number 23971 menC: o-succinylbenzoic acid synthase, no SWISS-PROT access number.
- the genes are amplified by PCR from the strain 168 [ANAGNOSTOPOULOS et al. , J. Bacteriol. 81: 741-747, (1961)] using the primers making it possible to obtain the coding sequence of the genes with the promoter and its terminator.
- Sense primer 5 'GTACTGCTGCCATCAGCCC 3'
- Antisense primer 5 'CCACGTCCTGTGACGAATACTCCGC 3'
- the approximately 8 kilobase fragment is cloned into a multicopy plasmid of the pIL253 type (SIMON et al. Biochemistry 559-566 1988).
- the functionality of the genes is determined by complementation of mutants in B. subtilis [MILLER et al. , J. Bacteriol., 170: 2735-2741, (1988)].
- the production of quinone is determined according to the procedure of MORISHITA et al. [J. Diary. Sci. 82: 1879-1903, (1999)].
- EXAMPLE 4 ISOLATION OF MUTANT STRAINS OF L. LACTIS HAVING A BETTER ABILITY TO BREATHE.
- the ability to breathe is characterized by the presence of heme in the cell.
- the gene coding for the catalase of a strain of Bacillus subtilis was previously cloned into L. lactis (application PCT / FR00 / 00885 in the names of 1 INRA and CEA; Inventors BRAVARD and DUWAT). Catalase needs heme for its activity.
- L. lactis strain containing the cloned catalase gene a transposition tool, pGhost9: ISS1 (PCT application WO 93/18164) is introduced. Mutagenesis is carried out and the mutants resulting from the mutagenesis are screened for their catalase activity in the presence of a small amount of hemin.
- Colonies showing strong catalase activity are selected.
- the mutation responsible for the increase in catalase activity is identified by techniques known to those skilled in the art, for example, according to the procedure of MAGUIN et al. , [J. Bacteriol., 178: 931-935, (1996)].
- the respiratory activity is tested for all mutant strains having an increased catalase activity compared to the wild strain.
- those with more efficient respiration can be identified by an increase in biomass, high final pH, and / or respiration in the presence of a smaller amount of hemin. Mutants will be reconstructed, and / or the plasmid containing the catalase can be eliminated.
- EXAMPLE 5 OBTAINING A STRAIN OF L. LACTIS WHOSE METABOLISM IS DRIVEN TOWARDS BREATHING.
- the enzymes that catalyze the breakdown of sugars for energy production are under the control of regulators.
- the CcpA regulator regulates the expression of several glycolytic enzymes, including phosphofructokinase, pyruvate kinase, and L-lactate dehydrogenase.
- a ccpA mutant characterized in fermentation conditions, produces a reduced amount of lactate, but a greater amount of acetate and ethanol, which confirms the regulatory role of CcpA [LUESINK et al. , Molecular Microbiology 30: 789-798, (1998)].
- the strain used in this example contains a ccpA gene inactivated by the insertion of a transposon, (but it is likely that any ccpA mutant gives rise to with similar results).
- the growth and the final biomass are determined in M17 medium plus glucose (1%) or BHI medium plus glucose (1%), and containing or not containing heme (10 ⁇ g / ml) and aerated or non-aerated.
- the mocula are prepared in M17 glucose.
- FIG. 1 represents the growth of the ccpA mutant, compared with that of the wild strain IL1403, in BHI medium containing 1% of glucose, and under aeration conditions, in the presence or in the absence of hemin. Symbols:, ccpA + hemme; D, ccpA without hemme, - *, IL1403 + hemme; ⁇ , IL1403 without hemme.
- the ccpA gene can also be placed under the control of a mductible promoter.
- Culture of bacteria for leaven preparation is carried out under conditions which do not induce the promoter, and ccpA is not expressed.
- the use of the leaven can be carried out under conditions inducing the promoter, and thus allowing the restoration of the expression of ccpA, producing a strain having activities equivalent to those of the wild strain.
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002385359A CA2385359A1 (fr) | 1999-09-20 | 2000-09-20 | Bacteries lactiques transformees pour leur conferer un metabolisme respiratoire et levains comprenant lesdites bacteries. |
EP00964333A EP1214419A2 (fr) | 1999-09-20 | 2000-09-20 | Bacteries lactiques transformees pour leur conferer un metabolisme respiratoire |
AU75293/00A AU783660C (en) | 1999-09-20 | 2000-09-20 | Lactic acid bacteria transformed to be provided with respiratory metabolism, and ferments comprising said lactic acid bacteria |
BR0014111-9A BR0014111A (pt) | 1999-09-20 | 2000-09-20 | Bactéria láctea recombinante, fermento lácteo, processos de cultura bacteriana, de preparação de um produto fermentado e de introdução de um gene codificando uma proteìna de interesse determinado e utilização de um fermento lácteo e de uma cepa |
PL00356133A PL356133A1 (en) | 1999-09-20 | 2000-09-20 | Lactic acid bacteria transformed to be provided with respiratory metabolism |
NO20021349A NO20021349L (no) | 1999-09-20 | 2002-03-19 | Melkesyrebakterier, transformerte til å v¶re utstyrt med respiratorisk metabolisme |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9911735A FR2798670B1 (fr) | 1999-09-20 | 1999-09-20 | Bacteries lactiques transformees pour leur conferer un metabolisme respiratoire, et levains comprenant lesdites bacteries |
FR99/11735 | 1999-09-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001021808A2 true WO2001021808A2 (fr) | 2001-03-29 |
WO2001021808A3 WO2001021808A3 (fr) | 2002-02-28 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2000/002611 WO2001021808A2 (fr) | 1999-09-20 | 2000-09-20 | Bacteries lactiques transformees pour leur conferer un metabolisme respiratoire |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1214419A2 (fr) |
AU (1) | AU783660C (fr) |
BR (1) | BR0014111A (fr) |
CA (1) | CA2385359A1 (fr) |
FR (1) | FR2798670B1 (fr) |
NO (1) | NO20021349L (fr) |
PL (1) | PL356133A1 (fr) |
WO (1) | WO2001021808A2 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009008726A1 (fr) * | 2007-07-12 | 2009-01-15 | Dsm Ip Assets B.V. | Réduction de nitrate par un probiotique en présence d'un hème |
CN111850148A (zh) * | 2020-08-05 | 2020-10-30 | 东北农业大学 | 一种能够进行有氧呼吸代谢乳酸乳球菌的筛选方法及其应用 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0111392A2 (fr) * | 1982-11-09 | 1984-06-20 | Morinaga Milk Industry Co., Ltd. | Culture contenant des masses cellulaires viables de bifidobactéries et de bactéries productrices d'acide lactique et procédé de préparation de cette culture |
US5486367A (en) * | 1992-10-13 | 1996-01-23 | Kansas State University Research Foundation | Enzymatic method for accelerating fermentation of comestible products |
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1999
- 1999-09-20 FR FR9911735A patent/FR2798670B1/fr not_active Expired - Fee Related
-
2000
- 2000-09-20 CA CA002385359A patent/CA2385359A1/fr not_active Abandoned
- 2000-09-20 AU AU75293/00A patent/AU783660C/en not_active Ceased
- 2000-09-20 BR BR0014111-9A patent/BR0014111A/pt not_active IP Right Cessation
- 2000-09-20 PL PL00356133A patent/PL356133A1/xx not_active Application Discontinuation
- 2000-09-20 WO PCT/FR2000/002611 patent/WO2001021808A2/fr active Search and Examination
- 2000-09-20 EP EP00964333A patent/EP1214419A2/fr not_active Withdrawn
-
2002
- 2002-03-19 NO NO20021349A patent/NO20021349L/no unknown
Patent Citations (2)
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EP0111392A2 (fr) * | 1982-11-09 | 1984-06-20 | Morinaga Milk Industry Co., Ltd. | Culture contenant des masses cellulaires viables de bifidobactéries et de bactéries productrices d'acide lactique et procédé de préparation de cette culture |
US5486367A (en) * | 1992-10-13 | 1996-01-23 | Kansas State University Research Foundation | Enzymatic method for accelerating fermentation of comestible products |
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DAILEY TAMARA A ET AL: "Expression of a cloned protoporphyrinogen oxidase." JOURNAL OF BIOLOGICAL CHEMISTRY, vol. 269, no. 2, 1994, pages 813-815, XP002144018 ISSN: 0021-9258 * |
DE FELIPE FELIX LOPEZ ET AL: "Cofactor engineering: A novel approach to metabolic engineering in Lactococcus lactis by controlled expression of NADH oxidase." JOURNAL OF BACTERIOLOGY, vol. 180, no. 15, août 1998 (1998-08), pages 3804-3808, XP002144016 ISSN: 0021-9193 * |
KNAUF H J ET AL: "Cloning, sequence, and phenotypic expression of katA, which encodes the catalase of Lactobacillus sake LTH677." APPLIED AND ENVIRONMENTAL MICROBIOLOGY, vol. 58, no. 3, mars 1992 (1992-03), pages 832-839, XP001002851 * |
LUESINK EVERT J ET AL: "Transcriptional activation of the glycolytic las operon and catabolite repression of the gal operon in Lactococcus lactis are mediated by the catabolite control protein CcpA." MOLECULAR MICROBIOLOGY, vol. 30, no. 4, novembre 1998 (1998-11), pages 789-798, XP000990948 ISSN: 0950-382X * |
SIJPESTEIJN A K: "INDUCTION OF CYTOCHROME FORMATION AND STIMULATION OF OXIDATIVE DISSIMILATION BY HEMIN IN STREPTOCOCCUS-LACTIS AND LEUCONOSTOC-MESENTEROIDES" ANTONIE VAN LEEUWENHOEK, vol. 36, no. 3, 1970, pages 335-348, XP000929155 ISSN: 0003-6072 cité dans la demande * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009008726A1 (fr) * | 2007-07-12 | 2009-01-15 | Dsm Ip Assets B.V. | Réduction de nitrate par un probiotique en présence d'un hème |
CN111850148A (zh) * | 2020-08-05 | 2020-10-30 | 东北农业大学 | 一种能够进行有氧呼吸代谢乳酸乳球菌的筛选方法及其应用 |
CN111850148B (zh) * | 2020-08-05 | 2022-12-09 | 东北农业大学 | 一种能够进行有氧呼吸代谢乳酸乳球菌的筛选方法及其应用 |
Also Published As
Publication number | Publication date |
---|---|
BR0014111A (pt) | 2002-05-14 |
FR2798670B1 (fr) | 2003-03-07 |
WO2001021808A3 (fr) | 2002-02-28 |
PL356133A1 (en) | 2004-06-14 |
EP1214419A2 (fr) | 2002-06-19 |
NO20021349L (no) | 2002-05-15 |
AU783660B2 (en) | 2005-11-24 |
AU7529300A (en) | 2001-04-24 |
AU783660C (en) | 2006-08-10 |
NO20021349D0 (no) | 2002-03-19 |
CA2385359A1 (fr) | 2001-03-29 |
FR2798670A1 (fr) | 2001-03-23 |
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