WO1996022365A1 - Enzymes that cleave and ligate dna - Google Patents
Enzymes that cleave and ligate dna Download PDFInfo
- Publication number
- WO1996022365A1 WO1996022365A1 PCT/US1996/000711 US9600711W WO9622365A1 WO 1996022365 A1 WO1996022365 A1 WO 1996022365A1 US 9600711 W US9600711 W US 9600711W WO 9622365 A1 WO9622365 A1 WO 9622365A1
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- WIPO (PCT)
- Prior art keywords
- enzyme
- dna
- dνa
- nae
- cleaved
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Classifications
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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
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
- C12N9/22—Ribonucleases RNAses, DNAses
Definitions
- This invention concerns enzymes that exhibit both cleaving and ligating activity, recombining DNA as well as relaxing supercoiled DNA to give topoisomers thereof.
- topoisomerases catalyze DNA relaxation by cleavage, strand passage and reunion; catalyze DNA rearrangements by concerted cleavage and exchange of DNA ends; and catalyze cleavage of single- and double-stranded DNA, respectively.
- These enzymes are ubiquitous and have essential roles in the replication, transcription, recombination, and repair of DNA. See, e . g. , A. Kornberg and T.A. Baker, DNA Replication (2nd ed., W.H. Freeman and Co., New York, (1991)) .
- Topoisomerases function in vivo to both cleave and ligate supercoiled DNA and thereby relax the DNA. Topoisomerases demonstrate sequence preferences, but are not sequence specific, and hence are not generally useful in recombinant DNA techniques.
- the endonucleases include as a special class the restriction enzymes, which function in bacteria to protect against foreign DNA.
- the restriction enzymes along with the site-specific recombinases, offer examples of sequence-specific DNA cleavage. Additionally, restriction enzymes may function at some level in vivo to produce DNA with recombinogenic ends. See, e . g. , R.J. Roberts, Crit. Rev. Biochem . 4, 123 (1976) ; . Arber, J. Struct . Biol . 104, 107 (1990) ; S. Chang and S.N. Cohen, Proc. Natl . Acad. Sci . USA 74, 4811 (1977) . The introduction of restriction enzymes into yeast and mammalian cells has been shown to induce DNA rearrangements. R. Schiestl and T. Petes, Proc . Natl .
- ligases Restriction enzymes and enzymes that ligate DNA (ligases) are together useful for carrying out recombinant DNA procedures. See, e . g. , S. Cohen and H.
- the enzyme (a) specifically binds to a DNA recognition site; (b) cleaves the DNA on binding to the DNA recognition site to form a cleaved DNA having a cleaved end segment; (c) forms a covalent intermediate with the cleaved DNA; (d) ligates the cleaved end segment with another end segment to form a ligated DNA; and (e) releases the DNA from the covalent intermediate upon the formation of the ligated DNA.
- a second aspect of the present invention is a polynucleotide encoding an enzyme as given above, along with host cells containing the polynucleotide and host cells that contain the polynucleotide and express the encoded enzyme.
- a third aspect of the present invention is a method for cleaving and ligating DNA.
- the method comprises contacting a DNA to an enzyme as described above, where the DNA contains a recognition site to which the enzyme specifically binds.
- the contacting step may be carried out in vi tro or in vivo.
- Figure 1 shows the effect of the 43K mutation on the activity of Nael
- Figure 2 shows an electron micrograph visualization of a pBR322 dimer formed by the action of Nael- 43K.
- Figure 3 shows the reaction of Nae J-L43K with pBR322 (4 Nae I recognition sequences) , Ml3 ds DNA (1 recognition sequence) and pUC (0 recognition sequences) .
- Amino acid sequences disclosed herein are presented in the amino to carboxy direction, from left to right. The amino and carboxy groups are not presented in the sequence. Both single letter and three letter abbreviations for amino acids are used.
- Nucleotide sequences are presented herein by single strand only, in the 5' to 3' direction, from left to right.
- the phrase "specifically binds” means binds one
- recognition site means the one DNA segment to which a particular enzyme specifically binds.
- Site-specific cleavage of DNA is cleavage either within or nearby a recognition site.
- Nearby is meant within a defined or specific number of nucleotides from the recognition site.
- Enzymes of the present invention specifically bind to a DNA recognition site and cleave the DNA on binding to the DNA recognition site to form a cleaved DNA having a cleaved end segment.
- Enzymes of the present invention form a covalent intermediate with the cleaved DNA, ligate the cleaved end segment with another end segment to form a ligated DNA, and release the DNA from the covalent intermediate upon the formation of the ligated DNA.
- cleavage of the DNA is carried out in a site-specific manner, as noted above.
- the covalent intermediate provides energy for the ligation reaction.
- the enzyme is not ATP-dependent, and in a particular embodiment is not ATP-dependent, is not NAD-dependent, and is not GTP-dependent .
- the covalent intermediate formed for the cleavage function of the enzyme may be released prior to the formation of the ligated DNA. In this case the covalent intermediate does not provide energy for the ligation reaction, and energy for the ligation reaction is provided by a ATP, NAD, GTP, or some other suitable energy source.
- the specific binding activity of enzymes of the present invention is reflected in at least a 10 3 -fold preference of the enzyme for the recognition site as compared to other segments, and may even be at least a 10 4 -fold preference, at least a 10 6 -fold preference, at least a 10 8 -fold preference or more.
- the recognition site for the enzyme is, as noted above, at least three nucleotides in length, and may be 6, 8, 10, 12, 14, 16 or 18 nucleotides in length, or more.
- the presence of "STAR" sites, or sites of relaxed specificity is common for enzymes that specifically bind to DNA, and is not to be excluded from the present invention.
- Enzymes according to the invention may be made from modification of an existing enzyme, including but not limited to type He restriction endonucleases, by techniques such as site-directed mutagenesis.
- the type He restriction enzymes require the recognition of a second DNA (effector) site to cleave DNA; putative homology has been found between the type HE enzyme Eco RU and the integrase family of proteins. See, M. Topal and M. Conrad, Nucleic Acids Res . 21:2599 (1993) .
- Examples of type He enzymes include, but are not limited to, Nae I (M. Conrad and M. Topal, Proc . Na tl . Acad . Sci . U.S.A. 86:9707 (1989)), Nar I, Bsp MI, Hpa II, Sac II (A.R. Oiler, et al . , Biochem 30:2543 (1991) , Eco RU
- Site-directed mutagenesis may be used to modify either the specificity (i.e., change the recognition site) or activity of another enzyme, including but not limited to type He restriction enzymes, to produce enzymes of the instant invention.
- the recognition site binding segment of one enzyme can be modified by substitution mutations to match the recognition site binding segment of a second enzyme to change the binding specificity of the first enzyme to that of the second enzyme.
- Site-directed mutagenesis may be carried out in accordance with known techniques. See, e . g. , U.S. Patent No. 4,873,192 to Kunkel; T. Kunkel, Proc . Natl . Acad. Sci . USA 82, 488 (1985) ; T. Kunkel et al .
- kits for carrying out this technique may be used, such as the MUTA-GENETM phagemid in vi tro mutagenesis kit by BIO-RAD (see generally BIO-RAD catalog number 170-3576 instruction manual) .
- the recognition site binding segment from one enzyme can be grafted into a second enzyme or exchanged with the recognition site binding segment of a second enzyme to produce enzymes of the present invention with a multiplicity of different binding specificities.
- Specificities of enzyme recognition sites may be altered by mutation, amplification and selection techniques such as the "SELEX” technique to produce enzymes of the present invention with altered binding and/or cleaving specificities. See U.S. Patent No.
- Enzymes of the present invention with altered binding and/or cleaving specificities may be produced by phage display techniques in accordance with known techniques. See, e . g. , Y. Choo and A. Klug, Proc . Natl .
- a further aspect of the present invention is, as noted above, a polynucleotide such as a DNA encoding an enzyme as described herein.
- a polynucleotide such as a DNA encoding an enzyme as described herein.
- Such a polynucleotide may be combined with a vector polynucleotide to provide a recombinant polynucleotide.
- a vector or vector polynucleotide is a replicable polynucleotide construct.
- Vectors are used herein either to amplify DNA encoding an enzyme of the invention and/or to express the enzyme.
- An expression vector is a replicable polynucleotide construct in which a polynucleotide encoding an enzyme of the invention is operably linked to suitable control sequences capable of effecting the expression of the enzyme in a suitable host. The need for such control sequences will vary depending upon the host selected and the transformation method chosen. Generally, control sequences include a transcriptional promoter, an optional operator sequence to control transcription, a sequence encoding suitable mRNA ribosomal binding sites, and sequences which control the termination of transcription and translation.
- Amplification vectors do not require expression control domains. All that is needed is the ability to replicate in a host, usually conferred by an origin of replication, and a selection gene to facilitate recognition of transformants.
- Vectors comprise plasmids, viruses (e.g., adenovirus, cytomegalovirus) , retroviruses, phage, and integratable DNA fragments (i.e., fragments integratable into the host genome by recombination) .
- viruses e.g., adenovirus, cytomegalovirus
- retroviruses e.g., retroviruses
- phage e.g., adenovirus, cytomegalovirus
- integratable DNA fragments i.e., fragments integratable into the host genome by recombination
- Expression vectors should contain a promoter and RNA binding sites which are operably linked to the gene to be expressed and are operable in the host organism.
- DNA regions are operably linked or operably associated when they are functionally related to each other.
- a promoter is operably linked to a coding sequence if it controls the transcription of the sequence; or a ribosome binding site is operably linked to a coding sequence if it is positioned so as to permit translation.
- Transformed host cells are cells which have been transformed or transfected with vectors containing a polynucleotide encoding an enzyme of the invention constructed using recombinant DNA techniques. Transformed host cells ordinarily express the enzyme, but host cells transformed for purposes of cloning or amplifying DNA need not express the enzyme.
- Suitable host cells include prokaryote, yeast or higher eukaryotic cells such as mammalian cells and insect cells. Cells derived from multicellular organisms are also a suitable host for synthesis of the enzymes of the instant invention receptor by recombinant means. Propagation of such cells in cell culture has become a routine procedure (Tissue Culture, Academic Press, Kruse and Patterson, editors (1973)) . Examples of useful host cell lines are VERO and HeLa cells, Chinese hamster ovary (CHO) cell lines, and WI138, BHK, COS-7, CV, and MDCK cell lines.
- Expression vectors for such cells ordinarily include (if necessary) an origin of replication, a promoter located upstream from the polynucleotide encoding the enzyme of the invention to be expressed and operatively associated therewith, along with a ribosome binding site, an RNA splice site (if intron-containing genomic DNA is used) , a polyadenylation site, and a transcriptional termination sequence.
- transcriptional and translational control sequences in expression vectors to be used in transforming vertebrate cells are often provided by viral sources.
- promoters are derived from polyoma, Adenovirus 2, and Simian Virus 40 (SV40) . See, e.g.. U.S. Patent No. 4,599,308.
- An origin of replication may be provided either by construction of the vector to include an exogenous origin, such as may be derived from SV 40 or other viral
- the vector may be provided by the host cell chromosomal replication mechanism. If the vector is integrated into the host cell chromosome, the latter is often sufficient.
- DHFR dihydrofolate reductase
- thymidine kinase thymidine kinase
- Host cells such as insect cells (e.g., cultured Spodoptera frugiperda cells) and expression vectors such as the baculovirus expression vector (e.g., vectors derived from Autographa californica MNPV, Trichoplusia ni MNPV, Rachiplusia ou MNPV, or Galleria ou MNPV) may be employed in carrying out the present invention, as described in U.S. Patents Nos. 4,745,051 and 4,879,236 to Smith et al.
- a baculovirus expression vector comprises a baculovirus genome containing the gene to be expressed inserted into the polyhedrin gene at a position ranging from the polyhedrin transcriptional start signal to the ATG start site and under the transcriptional control of a baculovirus polyhedrin promoter.
- Prokaryote host cells include gram negative or gram positive organisms, for example Escherichia coli (E. coli) or Bacilli. Higher eukaryotic cells include established cell lines of mammalian origin as described below. Exemplary host cells are E. coli 3110 (ATCC 27,325) , E. coli B, E. coli X1776 (ATCC 31,537) , E. coli 294 (ATCC 31,446) . A broad variety of suitable prokaryotic and microbial vectors are available. E. coli is typically transformed using pBR322.
- Promoters most commonly used in recombinant microbial expression vectors include the beta-lactamase (penicillinase) and lactose promoter systems (Chang et al . , Nature 275. 615 (1978) ; and Goeddel et al . , Nature 281, 544 (1979)) , a tryptophan
- the promoter and Shine-Dalgarno sequence are operably linked to the polynucleotide of the invention i.e., they are positioned so as to promote transcription of messenger RNA from the DNA.
- Eukaryotic microbes such as yeast cultures may also be transformed with vectors carrying polynucleotides of the invention. see. e.g., U.S. Patent No. 4,745,057. Saccharomyces cerevisiae is the most commonly used among lower eukaryotic host microorganisms, although a number of other strains are commonly available. Yeast vectors may contain an origin of replication from the 2 micron yeast plasmid or an autonomously replicating sequence
- ARS a promoter
- DNA encoding an enzyme of the invention
- sequences for polyadenylation and transcription termination and a selection gene.
- An exemplary plasmid is YRp7, (Stinchcomb et al., Nature 282. 39 (1979); Kingsman et al. , Gene 2, 141 (1979); Tschemper et al., Gene 10. 157 (1980)).
- Suitable promoting sequences in yeast vectors include the promoters for metallothionein, 3-phosphoglycerate kinase (Hitzeman et al., J. Biol. Chem. 255. 2073 (1980) or other glycolytic enzymes (Hess et al. , J. Adv.
- Enzymes of the invention produced as described above may be isolated and/or purified in accordance with conventional techniques, such as affinity chromatography, gel filtration, ultrafiltration, size-exclusion chromatography, etc.
- the nucleotides and enzymes of the present invention include the salts thereof, including physiologically and/or pharmaceutically acceptable salts thereof: i.e., salts that retain the desired biological activity of the parent compound and do not impart undesired toxicological effects thereto.
- salts examples include (a) salts formed with cations such as sodium, potassium, NH 4 + , magnesium, polyamines such as spermine and spermidine, etc.; (b) acid addition salts formed with inorganic acids, for example hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, nitric acid and the like; (c) salts formed with organic acids such as, for example, acetic acid, oxalic acid, tartaric acid, succinic acid, maleic acid, fumaric acid, gluconic acid, citric acid, malic acid, ascorbic acid, benzoic acid, tannic acid, palmitic acid, alginic acid, polyglutamic acid, naphthalenesulfonic acid, methanesulfonic acid, p-toluenesulfonic acid, naphthalenedisulfonic acid, polygalacturonic acid, and the like; and (d) salts formed from elemental anions such
- compositions or formulations of the present invention comprise the active agent (e . g. , enzyme, polynucleotide encoding the enzyme, vector carrying the polynucleotide, etc.) in a physiologically or pharmaceutically acceptable carrier, such as an aqueous carrier.
- the active agent e . g. , enzyme, polynucleotide encoding the enzyme, vector carrying the polynucleotide, etc.
- a physiologically or pharmaceutically acceptable carrier such as an aqueous carrier.
- the active agent is typically admixed with, inter alia, an acceptable carrier.
- the active agent e . g. , the enzyme of the invention
- a lipid particle or vesicle such as a liposome or microcrystal, which may be suitable for parenteral administration.
- the particles may be of any suitable structure, such as unilamellar or plurilamellar, so long as the enzyme is contained therein.
- Positively charged lipids such as N- [1- (2, 3-dioleoyloxi)propyl] -
- N,N,N-trimethyl-amoniummethylsulfate or "DOTAP," are particularly preferred for such particles and vesicles.
- compositions are particularly useful for delivering enzymes of the invention into a cell, as discussed below.
- enzymes of the present invention possess a variety of uses. They are useful for cleaving DNA, for relaxing supercoiled DNA, for specifically cleaving and recombining DNA in vivo or in vi tro, etc. They are useful as molecular weight markers. In general, the enzymes of the invention are useful as tools for carrying out genetic engineering and recombinant DNA techniques. In addition, DNA that is specifically cleaved and/or specifically ligated with the enzymes of the instant invention to produce a DNA of a particular molecular weight is useful as a molecular weight marker.
- a method for cleaving and ligating DNA comprises contacting a DNA to an enzyme as given herein, where the DNA contains a recognition site to which the enzyme specifically binds.
- the contacting step may be carried out so that only a single DNA species is cleaved and re-ligated, or may be carried out so that a first DNA species is cleaved and a second DNA species is ligated into the first DNA species to produce a recombinant DNA species.
- the contacting step may be carried out by any suitable means: it may be carried out in vi tro in an aqueous solution; it may be carried out in vivo in a cell.
- the cell may be one that contains a polynucleotide encoding the enzyme and expresses the encoded enzyme.
- the enzyme may be an exogeneous enzyme introduced into the cell by any suitable means, such as providing the enzyme contained within a lipid vesicle such as a liposome, and contacting the lipid vesicle to the cell so that the contents thereof are transported into the cell and released therein.
- Nael Nae I Site-Directed Mutagenesis of Nael Nae I is a 70 kDa dimeric protein with two DNA- binding sites, as indicated by the sigmoidal dependence of cleavage velocity on the concentration of recognition sequence. See C. Yang and M. Topal, Biochem . 31:9657 (1992) . Nae I is highly specific for its recognition sequence and exhibits a 10 ⁇ :L -fold discrimination between cognate and noncognate recognition sequences. See, C. Yang et al . , Biochem . 33, 14918 (1994) .
- the two DNA- binding sites of Nae I are nonidentical : one site prefers to bind to the recognition site with AT-rich flanking sequences, whereas the other prefers to bind to the recognition site with GC-rich flanking sequences (see Yang and Topal, supra) . It is unclear whether the binding differences preexist or are induced upon occupation of one DNA binding site. Since Nae I must bind two DNA recognition sequences, a DNA substrate with a single Nae I recognition sequence. This resistance can be overcome by the introduction of another DNA recognition sequence, either in cis or in trans, with affinity for the second DNA-binding site on the enzyme. See, M. Conrad and M. Topal, Proc . Na tl . Acad . Sci . USA 86:9707 (1989) . Nae I also induces loops in pBR322 DNA with Nae
- thermophilus 114 TVEHKVDGLS 123 SEQ ID NO:10
- Nae I The better matches of Nae I are with the active sites of the eukaryotic rather than the prokaryotic DNA ligases; the best match is with that of human DNA ligase I.
- the Nae I sequence differs, however, from the human ligase active site in one important respect:
- the lysine (K) that forms the adenylated intermediate essential for catalysis by the DNA ligase active site, is not present in Nae 2, instead there is a leucine (L43) at this position.
- Reactions used 1 ng of purified Nae I with 0.1 ⁇ g pBR322 DNA, 30 ng of purified Nae I-L43K with 1 ⁇ g pBR322 DNA, and 1 ⁇ g (total protein) of the respective cell extracts (not shown) and 1 ⁇ g pBR322 DNA in 15 ⁇ l of reaction buffer [10 mM Tris-Cl (pH 8.0) , 20 mM Nael, 10 mM MgCl 2 , BSA (0.1 mg/ml) , 5.0 mM ⁇ - mercaptoethanol] for 50 min at 37°C.
- Figure 1 illustrates the effect of the L43K mutation on the activity of Nae I .
- Figure 1 shows the products of incubating Nae I wild-type (wt) and Nae I- L43K with pBR322 DNA; lane 3, incubated with commercial Drosophila topoisomerase II (USB) ; lane 4, incubated with purified Nae I-L43K.
- L43K mutant or that overexpress Nae J-E70K a variant that binds to but cannot cleave DNA (J. Holtz and M.D. Topal, J. Biol . Chem . 269, 27286 (1994)) , lacked the topoisomerase activity.
- the enriched topoisomerase activity is specific to the L43K variant.
- Figure 2 shows the visualization of a pBR322 dimer formed by action of Nae I-L43K.
- Monomer pBR322 DNA circles (smaller circle) were incubated with Nae I. Reaction products were treated with SDS to remove protein and purified by gel permeation chromatography. DNA samples were prepared by EM using the denatured protein monolayer method. Molecular lengths were determined by measurements taken directly from micrographs using a Summagraphics digitizer. The circle crossing at its center is a dimer. EM courtesy of Dr. Kyusung Park, UNC. Bar equals 0.5 micrometers.
- the Nae J-L43K activity was isolated and purified to apparent homogeneity.
- cells are cracked open and debris spun out to produce a cell-free extract in accordance with standard techniques.
- the cell-free extract is then bound to DEAE-cellulose and eluted with buffer (20 mM potassium phosphate, pH 6. , 0.1 mM EDTA, 1 mM j ⁇ -mercaptoethanol, and 5% glycerol) containing a 0.05 to 1.0 M salt gradient.
- buffer (20 mM potassium phosphate, pH 6. , 0.1 mM EDTA, 1 mM j ⁇ -mercaptoethanol, and 5% glycerol) containing a 0.05 to 1.0 M salt gradient.
- the DEAE fraction in the eluate containing overexpressed topoisomerase activity were dialyzed, bound to an S-sepharose column, and eluted with buffer containing a 0.05 M salt gradient.
- the appropriate S-sepharose fraction in this second eluate was then in turn dialyzed, bound to phosphocellulose, and eluted with buffer containing a 0.1 to 0.6 M salt gradient.
- the appropriate S-sepharose fraction in this third eluate was then in turn dialyzed, bound to heparin agarose, and eluted with buffer containing a 0.1 to IM salt gradient.
- the resulting protein in the final eluate was greater than 97% pure and was purified to apparent homogeneity (when run on a standard polyacrylamide gel electrophoresis gel with SDS buffer, a single band is identified by Coomassie blue staining (30 ⁇ g protein per lane) .
- Prestained molecular weight markers carbonic anhydrase, ovalbumin, bovine serum albumin, phosphorylase B, and myosin heavy-chain
- apparent molecular weights as reported by the manufacturer, were also examined.
- a similar result was found using Nae I-L43K, but much less labeled protein was observed.
- the more transient nature of the intermediate in the L43K mutant compared to that in wt Nae I is consistent with a concerted displacement of the protein during religation.
- Nae I-D ⁇ A intermediate appears to be analogous to that in D ⁇ A ligases.
- the covalent intermediate formed between wt Nae I and pBR322 D ⁇ A indicate that the activated intermediate is formed during the cleavage step, independent of the L43K mutation.
- the unadenylated ligase motif of Nae I-L43K may use the activated D ⁇ A- protein intermediate formed during the cleavage step for resealing D ⁇ A breaks.
- Plasmid pUC18 lacks as Nae I recognition sequence; M13 double-strand DNA has one such sequence that is resistant to cleavage by Nae I because of its poor affinity for the Nae I effector-binding site. See M. Conrad and M. Topal, Proc . Na tl . Acad . Sci . U.S.A. 86, 9707 (1989) ; C. Yang and M. Topal, Biochem, 31, 9657 (1992) . Neither of these DNAs were substrates for Nae I-L43K. Plasmid pBR322 has four Nae I recognition sequences and is a good substrate for wt Nae I; this plasmid was a good substrate for Nae I-L43K (Fig. 3) .
- Figure 3 shows the reaction of Nae I-L43K with pBR322 (4 Nae I recognition sequences) , M13 ds D ⁇ A (1 recognition sequence) and pUC (0 recognition sequences) .
- Purified Nae I-L43K (30 ng) (shown) and cell extract (1 ⁇ g total protein) (not shown) was incubated with; Lanes 1 to 3, pBR322 D ⁇ A (1.0 ⁇ g) ; Lanes 4 to 6, M13mpl8 D ⁇ A (0.5 ⁇ g) ; Lanes 7 to 9, pUC D ⁇ A (0.75 ⁇ g) under reaction conditions indicated in the legend to Fig. 2.
- Products from all reactions were resolved by gel electrophoresis
Abstract
Description
Claims
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US38067195A | 1995-01-20 | 1995-01-20 | |
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US5434066A (en) * | 1992-01-24 | 1995-07-18 | Life Technologies, Inc. | Modulation of CRE recombinase in the in vivo cloning of DNA |
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- 1996-01-18 WO PCT/US1996/000711 patent/WO1996022365A1/en active Application Filing
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US5434066A (en) * | 1992-01-24 | 1995-07-18 | Life Technologies, Inc. | Modulation of CRE recombinase in the in vivo cloning of DNA |
Non-Patent Citations (4)
Title |
---|
JOURNAL OF BIOLOGICAL CHEMISTRY, Vol. 269, No. 51, issued 23 December 1994, SHUMAN, "Novel Approach to Molecular Cloning and Polynucleotide Synthesis Using Vaccinia DNA Topoisomerase", pages 32678-32684. * |
JOURNAL OF MOLECULAR BIOLOGY, Vol. 181, issued 1985, HOESS et al., "Mechanism of Strand Cleavage and Exchange in the Cre-lox Site-Specific Recombination System", pages 351-362. * |
NATURE, Vol. 327, issued 18 June 1987, BUSK et al., "Preferential Relaxation of Supercoiled DNA Containing a Hexadecameric Recognition Sequence for Topoisomerase I", pages 638-640. * |
SCIENCE, Vol. 267, issued 24 March 1995, JO et al., "DNA Topoisomerase and Recombinase Activities in Nae I Restriction Endonuclease", pages 1817-1820. * |
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