EP2183370A1 - Herstellung von genetisch modifizierten aktinomyceten durch rekombination - Google Patents
Herstellung von genetisch modifizierten aktinomyceten durch rekombinationInfo
- Publication number
- EP2183370A1 EP2183370A1 EP08715737A EP08715737A EP2183370A1 EP 2183370 A1 EP2183370 A1 EP 2183370A1 EP 08715737 A EP08715737 A EP 08715737A EP 08715737 A EP08715737 A EP 08715737A EP 2183370 A1 EP2183370 A1 EP 2183370A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- streptomyces
- plasmid
- cre
- actinomycetes
- dna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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Classifications
-
- 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
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/76—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Actinomyces; for Streptomyces
Definitions
- the present invention relates to nucleic acid molecules replicable in host cells which contain novel DNA sequences which code for the Dre or Cre recombinase. Furthermore, the invention relates to a recombination system for altering DNA fragments (excision, integration, inversion or translocation) of the genome (target DNA) of actinomycetes. In addition, the invention relates to a process for the preparation of modified actinomycetes, as well as the modified microorganisms themselves, which were prepared by this method.
- actinomycetes are understood as meaning gram-positive bacteria which have a high G + C ratio.
- these are those bacteria that are naturally found in the soil and preferably belong to the species Streptomyces.
- a recombination method it is necessary to introduce and express the nucleic acids encoding the recombinases into the host cell. This can be done for example by means of a plasmid, wherein the expression of the recombinases can be controlled when using inducible promoters. The recombinases can then effect the alteration of the genome of the host cell.
- the nature of the recombination is determined here by the arrangement of the recognition sequences loxP and rox to each other on a DNA section.
- the introduction of recognition sequences into the genome of the host cell can be carried out by conventional methods, for example by homologous recombination. In the presence of two identical recognition sequences, the recombinase can cause the excision of the DNA fragment located between these recognition sequences, whereby the excised DNA fragment can subsequently cyclize. Furthermore, it is possible to insert cyclic nucleic acid molecules which have a recognition sequence, for example in the form of a plasmid, into the genome of the host cell. For this purpose, a recognition sequence is also necessary in the genome of the host cell, whereupon the recombinase causes an exchange of the nucleic acid strands on the recognition sequences. Similarly, insertion of a cyclic nucleic acid molecule into E.
- coli strains occurs using the recognition sequences attP (bacteriophage recognition sequence) and attB (bacterial recognition sequence, see Figure 2). This process is through two enzymes catalyzes: the phage protein integrase and the bacterial integration host factor (IHF).
- the phage genome is present after integration as a prophage in the bacterial genome, and is flanked by the newly formed recombination sites.
- the recombination systems presented above can be introduced into actinomycetes by means of plasmids and duplicated there.
- the nucleotide sequences which code for the Cre and Dre recombinases, together with the necessary promoters and origins of replication, can be cloned into a suitable plasmid become.
- This plasmid can be introduced, for example, by conjugation in a microorganism and reproduced there. It is critical if the recombinases are expressed in the host organisms.
- the recombination systems introduced into the host organism should be able to insert, for example, DNA fragments into or out of the genome of a host organism. In this way it is possible, for example, to switch on or off genes of the host organism, which influences the production of the desired active substances or secondary metabolites.
- a further preferred embodiment is the use of a recombination system for excising, integrating, inverting or translocating DNA fragments into actinomycetes. Furthermore, the invention relates to a modified microorganism prepared by the method according to the invention.
- nucleic acid molecules of the invention encoding these proteins.
- nucleic acid molecules are synthetic genes made by codon usage optimization. The most preferred are actinomycetes codons. Table 1 lists the preferred actinomycete codons.
- the nucleic acid molecules have at least 70% of such codons, which are preferred by actinomycetes and listed in Table 1. More preferably, the nucleic acid molecules comprise at least 75%, more preferably at least 80%, even more preferably at least 85%, even more preferably at least 90% and most preferably at least 95% of actinomycetes preferred codons from Table 1.
- the integration of the recognition sequences are carried out with plasmids containing no ori-rep (origin of replication actinomycetes), no int ⁇ C31 gene and no attP sequence.
- Genes encoding recombinases are introduced into the strains with replicable plasmids containing no int ⁇ C31 gene and no attP sequence, or are introduced with integrative vectors containing an int ⁇ C31 gene and an attP sequence, and an inducible vector Promoter included, brought into the strains.
- the vectors can be integrated into the chromosome of the target organism.
- DNA fragments to be inserted includes any DNA sequences, regardless of their base pair number. Similarly, any nucleic acid molecule or fragment can be excised between two recognition sequences from the target DNA.
- the DNA fragment to be inserted can preferably be introduced into the host cell by means of a plasmid.
- the plasmid additionally preferably has a recognition sequence which corresponds to a recognition sequence in the target DNA.
- the plasmid additionally preferably contains an origin of replication for actinomycetes and more preferably an origin of replication for E. coli.
- the amplification of the plasmids in steps (a) and (b) can be accomplished using standard conditions. Furthermore, the plasmids are expressed in the actinomycetes and the recombinases produced thereby. The recombinases then recognize the recognition sequences in the target DNA and cause site-specific alterations of the target DNA.
- the presence of at least two identical recognition sequences for a specific recombinase is necessary.
- different recombination systems or recombinases are used.
- at least two different recognition sequences selected from the loxP and rox recombination recognition sequences are inserted into the target DNA. This allows, for example, the subsequent insertion of two different DNA fragments adjacent to different recognition sequences, for example one DNA fragment using the rox recognition sequence and the Dre recombinase and the other DNA fragment using, for example, the loxP recognition sequence and the Cre recombinase can be inserted.
- the method of modifying microorganisms is further elaborated in the examples.
- a marker gene for the identification and selection of the modified host cells is also introduced into the target DNA.
- marker genes are known to those skilled in the art and described in the literature (DeWet et al., Mol. Cell Biol., 1987, 7, 725-737, Goff et al., EMBO J., 1990, 9, 2517-2522, Kain et al., BioTechniques, 1995, 19, 650-655; Chiu et al., Current Biology, 1996, 6, 325-330).
- biosynthetic gene cluster II The entire biosynthetic gene cluster (biosynthetic gene cluster II) of a natural product, whose synthesis is desired in large quantities, is also cloned with the new technology and then brought into the altered overproduction strain. It may be possible to previously exchange promoters on the biosynthetic gene cluster II. Thus, the synthetic power for the natural product I is transferred to the synthesis power for the natural product II.
- Figure 1 relates to Cre-Iox reactions depending on the orientation and spatial arrangement of the loxP interfaces. Paired loxP recognition sequences (triangles) are directional and can be localized in cis (the same DNA strand) or trans (different DNA strands) array.
- Figure 2 shows the activity of Cre recombinase in Streptomyces lividans. Schematically, it is shown how int ⁇ C31, the gene coding for the integrase of phage ⁇ C31, is introduced into the chromosome of S. lividans.
- Figures 4A and 4B show the original sequences (gene sequences SEQ ID NO: 1 and
- Figure 6 shows the recognition sequences loxP (SEQ ID NO: 8) and rox (SEQ ID NO: 9).
- FIGS. 7A-D show the plasmids according to the invention pUWL-T, pUWL-A, pUWL-H, and pNL1, which can be used to introduce and express the recombinases in actinomycetes.
- pUWL-T was obtained from pUW201 by introducing the oriT (sequence important for the conjugation process).
- pUWL-A and pUWL-H were generated from pUWL-T by replacing the antibiotic resistance genes (T, thiostrepton, A, apramycin, H, hygromycin).
- pNL1 was generated from pI8600 (cloning an Eco / RI-bamHI fragment containing the tipA promoter and the thiostrepton resistance gene) and pKC1139 (cloning an Eco / RI- ⁇ g / II fragment containing the temperature-sensitive replicon pSG5 and the apramycin resistance aac (3 IV).
- ermE strong promoter for expression in actinomycetes
- bla ⁇ -lactamase
- ori CoIEI origin of replication necessary for replication in E. coli
- ori pUC18 origin of replication necessary for replication in E. coli
- tsr thiostrepton resistance gene
- aac (3) IV apramycin resistance gene, hyg, hygromycin resistance gene , rep PIJ101 , origin of replication necessary for replication in actinomycetes.
- pSG5 rep temperature-sensitive replication origin necessary for replication in streptomycetes, tipA, thiostrepton promoter;
- Figures 7E and 7F show maps of plasmids incorporating the synthetic codon-optimized cre (a) gene of the present invention.
- Figure 7E shows schematically the plasmid pNLCRE and
- Figure 7F shows schematically the plasmid pUWLCRE.
- Figures 8A and B show the plasmids of the present invention which can be used to delete and clone a natural product biosynthetic gene cluster.
- Plasmid pDel1 and pDel2 were prepared by PCR fusion. Starting vectors for the PCR were pUC19 and plJ773 (Khodakaramian et al., Nucleic Acids Res., 2006, 34, e20).
- Figure 9 shows Table 1.
- Table 1 shows the codon usage of actinomycetes. (Http://www.nih.go.jp/ ⁇ jun/act/codon/104.html).
- the strain Streptomyces lividans TK24 was used as a model strain to carry out the expression of the native Cre and the synthetic Cre (a) genes.
- E. coli strain DH5a was used and strain ET12567 / pUZ8002 was used to effect the conjugative transfer of unmethylated nucleic acid from E. coli to S. lividans.
- the native Cre gene includes 145 codons which are used, for example, in Streptomyces coelicolor with a frequency of less than 1%. These codons can therefore be considered as rare codons. Because gene expression from rare codons can lead to errors in translation, modified genes according to the invention have been designed and synthesized (cre (a)) using the preferred codons of Streptomyces coelicolor. Genes of the genus Streptomyces have a GC content that is typically greater than 70%. The genes according to the invention preferably have a G + C content of more than 65%. Particularly preferred is a G + C content of 67.7% for cre (a).
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- Organic Chemistry (AREA)
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- Molecular Biology (AREA)
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Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08715737A EP2183370A1 (de) | 2007-08-30 | 2008-02-12 | Herstellung von genetisch modifizierten aktinomyceten durch rekombination |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07017025A EP2031067A1 (de) | 2007-08-30 | 2007-08-30 | Herstellung von genetisch modifizierten Aktinomyceten durch Rekombination |
| PCT/EP2008/001055 WO2009030286A1 (de) | 2007-08-30 | 2008-02-12 | Herstellung von genetisch modifizierten aktinomyceten durch rekombination |
| EP08715737A EP2183370A1 (de) | 2007-08-30 | 2008-02-12 | Herstellung von genetisch modifizierten aktinomyceten durch rekombination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2183370A1 true EP2183370A1 (de) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07017025A Withdrawn EP2031067A1 (de) | 2007-08-30 | 2007-08-30 | Herstellung von genetisch modifizierten Aktinomyceten durch Rekombination |
| EP08715737A Withdrawn EP2183370A1 (de) | 2007-08-30 | 2008-02-12 | Herstellung von genetisch modifizierten aktinomyceten durch rekombination |
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| EP07017025A Withdrawn EP2031067A1 (de) | 2007-08-30 | 2007-08-30 | Herstellung von genetisch modifizierten Aktinomyceten durch Rekombination |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20100221812A1 (de) |
| EP (2) | EP2031067A1 (de) |
| WO (1) | WO2009030286A1 (de) |
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| JP5927593B2 (ja) * | 2014-05-13 | 2016-06-01 | 学校法人北里研究所 | 微生物を用いたマイコスポリン様アミノ酸を生産する方法 |
| CN107779462B (zh) * | 2016-08-29 | 2021-06-04 | 中国科学院分子细胞科学卓越创新中心 | 双同源重组谱系示踪技术 |
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| ES2256972T3 (es) * | 1997-11-18 | 2006-07-16 | Pioneer Hi-Bred International, Inc. | Metodo novedoso para la integracion de un adn foraneo dentro de genomas de eucariotas. |
| WO2002103010A1 (en) * | 2001-06-14 | 2002-12-27 | Plant Bioscience Limited | Methods and materials for targeted gene disruption in actinomycete bacteria |
-
2007
- 2007-08-30 EP EP07017025A patent/EP2031067A1/de not_active Withdrawn
-
2008
- 2008-02-12 US US12/674,888 patent/US20100221812A1/en not_active Abandoned
- 2008-02-12 WO PCT/EP2008/001055 patent/WO2009030286A1/de not_active Ceased
- 2008-02-12 EP EP08715737A patent/EP2183370A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| CONNELL N D: "Expression systems for use in actinomycetes and related organisms", CURRENT OPINION IN BIOTECHNOLOGY, LONDON, GB LNKD- DOI:10.1016/S0958-1669(00)00243-3, vol. 12, no. 5, 1 October 2001 (2001-10-01), pages 446 - 449, XP002470819, ISSN: 0958-1669 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2031067A1 (de) | 2009-03-04 |
| US20100221812A1 (en) | 2010-09-02 |
| WO2009030286A1 (de) | 2009-03-12 |
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