Name: streamlined purification of plasmid dna from prokaryotic cultures
Uploaded: 2011-01-05T17:00:00.000+00:00
Duration: 6 min 53 s
Description: Watch this Scientific Journal Video about Streamlined Purification of Plasmid DNA From Prokaryotic Cultures at JoVE.com

1. Lizat Gümrükleme <ol><li> E. büyütün Luria Broth 37 gecede uygun antibiyotik ile derin kuyu plakaları istenen plazmid DNA (kültür / iyi 1 ml) ° C sallayarak ile dönüştürdü coli kültürleri. </li><li> 10 dakika boyunca 5.000 xg&#39;de kültür plakası Pelet E. coli, sonra süzün süpernatant. </li><li> 100 mcL Tekrar Süspansiyonu Buffer (50 mM Tris-HCl, pH 8.0, 10 mM EDTA, 100 mikrogram / mL RNaz A) her pelletini tekrar. </li><li> 100 mcL / iyi Lizis Buffer (200 mM NaOH,% 1 SDS) ekleyin ve 2 dakika boyunca plaka çalkalayıcı kullanarak sallamak. </li><li> 100 kuyu / mcL Nötralizasyon Buffer (3.0 M potasyum asetat, pH 5.5) ekleyin ve 2 dakika çalkalanır. </li><li> Açıklama plaka lizat hücre lizat aktarın. </li><li> 350 mcL toplama plakası ve vakum manifoldunun altına yeri üstüne yerleştirin DNA bağlayıcı plaka. (Bkz. Şekil 1) vakum manifoldunun birleştirin. </li><li> Elektrikli cihazların üstüne yerleştirin lizat açıklama plakası. </li><li> 10 inç Hg (0,34 bar) vakum uygulayın ve DNA bağlayıcı plakasına süzüntü toplamak. Hg in 12 daha büyük vakum kullanmayın. (0.41 bar). </li><li> Vakum manifoldunun sökün. Aparat altına yerleştirin 2 mL atık toplama plakası. </li></ol> 2. DNA Bağlama <ol><li> (Bkz. Şekil 2) DNA bağlayıcı plaka manifoldunun üstüne taşıyın. </li><li> 300 mcL / iyi Bağlama Buffer (6 M Guanidin-HCl) ekleyin ve karıştırın ve aşağı yukarı pipetle. </li><li> Vakum uygulayın [~ Hg yavaş vakum inç 5 (0.17 çubuğu)] ve süzüntü atın. DNA membrana bağlı. </li><li> Yıkama Tamponu (80% Etanol) / iyi 400 mcL ile yıkayınız. </li><li> Vakum uygulayın, sonra süzüntü atın. 2 mL toplama plakası kullanılarak veya doğrudan atık filtreleme, gereksiz yere atın. </li><li> Tekrar bir kez yıkayın. </li><li> Leke alt kurumaya havluya filtre plaka. </li><li> Artık alkol kaldırılmasını sağlamak için 5-10 dakika bir kez daha vakum uygulayın. </li><li> Etanol damlacıkların kaldırılmasını sağlamak için alt kurutun. </li></ol> 3. DNA Elüsyon <ol><li> 70 kuyu / mcL Elüsyon Buffer (10 mM Tris-HCl, pH 8.0, 1 mM EDTA) ekleyin. Yüksek DNA konsantrasyonu isteniyorsa, hacim 50 mcL / iyi olabilir, ama ortalama toplam verim düşük olacaktır. </li><li> Plaka, bir dakika oda sıcaklığında inkübe edin. </li><li> Arıtılmış DNA ya vakum veya santrifüj tarafından yıkandı, olabilir. </li><li> Vakum yöntemi: Vakum manifoldu içine yerleştirin temiz toplama plakası (DNaz, RNaz ücretsiz). Tüm elüsyon tampon DNA bağlayıcı plaka geçti kadar vakum manifoldunun üstüne koyun filtre plakası, 15 inç Hg (0,5 bar) 1 dakika için vakum uygulamak. Saflaştırılmış DNA (bkz. Şekil 3) toplayın. </li><li> Santrifüj yöntemi: 5 dakika 1000 xg&#39;de temiz toplama plakası ve santrifüj üst üste yerleştirin arıtma filtre plakası. </li></ol> 4. Nicel ve Nitel Analiz <ol><li> OD 260/280 ölçün, saflaştırılmış DNA konsantrasyonu hesaplar. </li><li> Saflaştırılmış pDNA agaroz jel analizi gerçekleştirin. </li></ol> 5. Temsilcisi Sonuçlar E. coli, malzeme başlayan enkaz kayda değer bir azalma gösterdi geleneksel santrifüj ve Pall AcroPrep Advance lizat açıklama Filtre Tabaklar kullanarak açıklık lizat . (Şekil 4). Üç konsantrasyonlarda Plazmid DNA TE tampon içine çivili ve AcroPrep Advance lizat açıklama filtre plakası üzerinden geçti. Plazmid DNA konsantrasyonunun karşılaştırılması, filtrasyon öncesi ve sonrası, gösteriler üç konsantrasyonlarda% 100 iyileşme (Şekil 5) ~. Açıklık E. DNA kurtarma göstermek için coli lizat, plazmid DNA ham lizat çivili ve daha sonra filtrasyon ile duruluğu . Aynı plazmid DNA, hücre lizat aşağıdaki filtreleme eklendi. Elektroforez her bir örnek (Şekil 6) hacimde yapıldı. Her numune benzer şiddette bir tek, net bant filtreleme tabanlı açıklama adımı sırasında biraz varsa DNA kaybı göstermektedir. Kültürler E. pCAT plazmid DNA içeren coli E. arınmış coli Pall Kullanıcı mcL 350 ve 1 ml DNA bağlayıcı Filtre Tabaklar, 350 mcL DNA bağlayıcı plakaların yanı sıra diğer iki marka lizatları. Üreticinin tavsiye ettiği protokolde belirtildiği gibi tüm arındırmalardan yapıldı. Yüksek DNA konsantrasyonu ve toplam verim Pall 1 ml AcroPrep Advance DNA arıtma filtresi plaka (Şekil 7 ve Tablo 2) görülür. Rakip W yüksek DNA konsantrasyonu (155 ng / ml) göstermesine rağmen, toplam DNA verimi (4.7 mikrogram / iyi) düşük kurtarma hacmi nedeniyle düşük olduğu, ~ 30 mcL. Rakip M 108 DNA düşük konsantrasyon verdi ng / toplam 5.6 mg / iyi bir verim ile mcL. Agarose jel üç farklı DNA bağlayıcı plakaları pCAT saflaştırılmış DNA analizi Şekil 8&#39;de gösterilmiştir. Her toplanan numune hacmi elektroforez önce kurtarma hacmi farklılıkları düzeltmek için 65 mcL ayarlandı. Tüm numuneler plazmid DNA supercoiled gösterir, ancak her Filtre Tabaklar DNA verimi değişir. Şekil 9 hazırlanan DNA supercoiled formu ve benzeri konsantrasyon gösterir. <img src="/files/ftp_upload/2407/2407fig1.jpg" alt="Şekil 1" /> Şekil 1. Lizat netleştirilmesi için vakum Manifold Meclisi. <img src="/files/ftp_upload/2407/2407fig2.jpg" alt="Şekil 2" /> Şekil 2. DNA Ciltleme için vakum Manifold Meclisi. <img src="/files/ftp_upload/2407/2407fig3.jpg" alt="Şekil 3" /> Şekil 3. Vakum Elüsyon için vakum Manifold Meclisi. <img src="/files/ftp_upload/2407/2407fig4.jpg" alt="Şekil 4" /> Şekil 4. Filtrasyon örnek açıklama kolaylaştırır. Vakum filtrasyonu (350 mcL AcroPrep Advance lizat açıklama filtre plakası) veya geleneksel santrifüj açıklık ham lizat 300 mcL üç nüsha örnekleri. OD 320 açıklama öncesi ve sonrası ölçülmüştür. <img src="/files/ftp_upload/2407/2407fig5.jpg" alt="Şekil 5" /> Şekil 5. PDNA AcroPrep Advance lizat açıklama filtre plakası geçişi sonra tam iyileşme. 300 mcL TE tampon, 25, 50 ve 100 mikrogram / mL pCAT ile çivili. DNA konsantrasyonu ve kurtarma, K = 2 öncesi ve filtrasyon sonra OD 260 hesaplanmıştır. <img src="/files/ftp_upload/2407/2407fig6.jpg" alt="Şekil 6" /> Şekil 6. Açıklama sonra pCAT DNA Kurtarma. Eşit miktarda, açıklama öncesinde veya sonrasında lizat içine çivili pUC19 sonra TE tamponunda 10 1 seyreltilmiş. % 1.2 agaroz jel üzerinde 2 mcL / şeritli yüklendi. <img src="/files/ftp_upload/2407/2407fig7.jpg" alt="Şekil 7" /> Şekil 7. Pall Acroprep Advance DNA rakip plakalar daha bağlayıcı filtre plakası ile ortalama Yüksek plazmid DNA verim 1 ml (Pall ve Rakip M) veya 1.5 mL (Rakip W) bir gecede kültürü ile gösterilir DNA arıtma plakaları kullanılarak pCAT plazmid DNA verimi (OD 260) DH5α. Plaka üreticinin tavsiye protokolü kullanılarak saflaştırılması. Hata çubukları standart hata (n&gt; 6) işaret etmektedir. <img src="/files/ftp_upload/2407/2407fig8.jpg" alt="Şekil 8" /> Şekil 8. PCAT DNA agaroz jel analizi belirtilen DNA bağlayıcı plaka saflaştırılmış. Saflaştırılmış pDNA% 1.2 agaroz jel elektroforezi. Örnekleri, üç ayrı arındırmalardan Pooled eluat arıtma, seyreltilmiş 01:10 sonra 65 mcL ayarlanır. Hat başına 2 mcL yüklendi. <img src="/files/ftp_upload/2407/2407fig9.jpg" alt="Şekil 9" /> Şekil 9. Kalite ve santrifüj veya vakum yöntemleri saflaştırılmış pDNA son eluat toplama agaroz jel elektroforezi için kullanılan benzer saf dna kurtarma. PDNA arıtma AcroPrep Gelişmiş Filtre Tabaklar için üreticinin tavsiye ettiği protokol izledi. Elüsyon, 2 dakika için 15 inç Hg (0,5 bar) ile 5 dakika veya vakum 1000 xg&#39;de santrifüj tarafından yapıldı.

Bu video makalenin yazarları, video ve metin özellikli cihaz ve reaktiflerin üreten Pall Yaşam Bilimleri çalışanları.

Biz çeşitli avantajları tanıyor AcroPrep Advance Filtre Tabaklar facile, aerodinamik protokol açıklar. Bu yöntem, manuel, yarı otomatik veya tam otomatik AcroPrep Advance biçimlerde işlenmiş, maksimum plazmid DNA verim sağlar. Lizat açıklık plaka üzerinde entegre bir ön filtre örnekleri, hatta partikül bu içeren yüksek düzeyde tutarlı filtrasyon sağlar. , Daha hızlı, daha düzgün bir plaka üzerinde minimal tutma hacmi ile filtrasyon hızları plaka sonuçlarının iyi geometri ve çıkış uç geometrisi, çapraz kontaminasyon endişeleri olmaksızın alıcı plakasına doğrudan numune akışı sağlar. Önemlisi, AcroPrep Gelişmiş Filtre Tabaklar DNA bağlayıcı plaka yüksek bağlama kapasitesi membran yüksek kalite plazmid DNA maksimum kurtarma için optimize edilmiştir.

<table><tbody><tr><td>AcroPrep Advance Filter plate</td><td>Pall Corporation</td><td>PN 8175 (1 mL) or PN 8075 (350 &amp;#181;l)</td><td>3 &amp;#x03BC;m glass fiber 0.2 &amp;#x03BC;m Supor&amp;#174; membrane for clarification</td></tr><tr><td>AcroPrep Advance Filter Plate</td><td>Pall Corporation</td><td>PN 8132</td><td>for DNA Binding</td></tr><tr><td>Vacuum manifold</td><td>Pall Corporation</td><td>PN 5017</td><td></td></tr><tr><td>Vacuum pressure pump</td><td>Pall Corporation</td><td>PN 13157</td><td></td></tr></tbody></table>

streamlined purification of plasmid dna from prokaryotic cultures

Biz prokaryotik kültürünün başlangıç ​​ve yüksek saflıkta DNA ile biten, 96 plazmid hazırlıkları için AcroPrep Gelişmiş Filtre Tabaklar süreci tanımlamak. Bakteriyel lizat açıklık ve DNA saflaştırma için çok iyi filtrasyon dayanarak, bu yöntem plazmid hazırlanması için akıcı bir süreç oluşturur. Silika-tabanlı medya içeren Filtre plakalar, vakum filtrasyon veya santrifüj plazmid DNA kayda değer miktarda verim kolayca işlenebilir. Nicel analiz saflaştırılmış plazmid DNA 1.97 ortalama OD 260/280 oranları ile yüksek kalitede sürekli olarak belirler. Genel olarak, sıralama ve klonlama gibi downstream uygulamalar için daha saf DNA plazmid verim sunuyoruz. Aerodinamik AcroPrep Gelişmiş Filtre Tabaklar kullanarak bu yöntem, manuel, yarı otomatik veya tam otomatik işleme sağlar.

Watch this Scientific Journal Video about Streamlined Purification of Plasmid DNA From Prokaryotic Cultures at JoVE.com

Streamlined Purification of Plasmid DNA From Prokaryotic Cultures

Bu protokol, verimli paralel açıklama ve plazmid DNA arıtma için uygun maliyetli bir alternatif<em&gt; E. coli</em&gt; Kültürler. AcroPrep Advance sürecinin yüksek bir bağlama kapasitesi DNA bağlayıcı filtre plakası arıtma ile optimize edilmiş bir lizat açıklama filtre plakası ile başlar.

Prokaryotik Kültürler itibaren Plazmid DNA Aerodinamik Arıtma

We describe the complete process of AcroPrep Advance Filter Plates for 96 plasmid preparations, starting from prokaryotic culture and ending with high ...

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Video: Streamlined Purification of Plasmid DNA From Prokaryotic Cultures

A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1

Higher-order nucleic acid structures called G-quadruplexes (G4s, G4 structures) can form in guanine-rich regions of both DNA and RNA and are highly thermally stable. There are &#62;375,000 putative G4-forming sequences in the human genome, and they are enriched in promoter regions, untranslated regions (UTRs), and within the telomeric repeat. Due to the potential for these structures to affect cellular processes, such as replication and transcription, the cell has evolved enzymes to manage them. One such enzyme is G4 Resolvase 1 (G4R1), which was biochemically co-characterized by our laboratory and Nagamine et al. and found to bind extremely tightly to both G4-DNA and G4-RNA (Kd in the low-pM range). G4R1 is the source of the majority of G4-resolving activity in HeLa cell lysates and has since been implicated to play a role in telomere metabolism, lymph development, gene transcription, hematopoiesis, and immune surveillance. The ability to efficiently express and purify catalytically active G4R1 is of importance for laboratories interested in gaining further insight into the kinetic interaction of G4 structures and G4-resolving enzymes. Here, we describe a detailed method for the purification of recombinant G4R1 (rG4R1). The described procedure incorporates the traditional affinity-based purification of a C-terminal histidine-tagged enzyme expressed in human codon-optimized bacteria with the utilization of the ability of rG4R1 to bind and unwind G4-DNA to purify highly active enzyme in an ATP-dependent elution step. The protocol also includes a quality-control step where the enzymatic activity of rG4R1 is measured by examining the ability of the purified enzyme to unwind G4-DNA. A method is also described that allows for the quantification of purified rG4R1. Alternative adaptations of this protocol are discussed.

G4 Resolvase1 binds to G-quadruplex (G4) structures with the tightest reported affinity for a G4-binding protein and represents the majority of the G4-DNA unwinding activity in HeLa cells. We describe a novel protocol that harnesses the affinity and ATP-dependent unwinding activity of G4-Resolvase1 to specifically purify catalytically active recombinant G4R1.

Enzimatik olarak aktif G4 Resolvase1 saflaştırılması için bir G-dörtlüsü DNA eğilim yaklaşım

Higher-order nucleic acid structures called G-quadruplexes (G4s, G4 structures) can form in guanine-rich regions of both DNA and RNA and are highly ...

Biyokimya

Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit

Plasmid DNA purification from E. coli is a core technique for molecular cloning. Small scale purification (miniprep) from less than 5 ml of bacterial culture is a quick way for clone verification or DNA isolation, followed by further enzymatic reactions (polymerase chain reaction and restriction enzyme digestion). Here, we video-recorded the general procedures of miniprep through the QIAGEN's QIAprep 8 Miniprep Kit, aiming to introducing this highly efficient technique to the general beginners for molecular biology techniques. The whole procedure is based on alkaline lysis of E. coli cells followed by adsorption of DNA onto silica in the presence of high salt. It consists of three steps: 1) preparation and clearing of a bacterial lysate, 2) adsorption of DNA onto the QIAprep membrane, 3) washing and elution of plasmid DNA. All steps are performed without the use of phenol, chloroform, CsCl, ethidium bromide, and without alcohol precipitation. It usually takes less than 2 hours to finish the entire procedure.

Plazmid DNA Qiagen Miniprep Kit kullanarak Bakteri kolonileri Arındırıcı

Plasmid DNA purification from E. coli is a core technique for molecular cloning. Small scale purification (miniprep) from less than 5 ml of bacterial ...

Biyoloji

A Purification and In Vitro Activity Assay for a (p)ppGpp Synthetase from Clostridium difficile

Kinase and pyrophosphokinase enzymes transfer the gamma phosphate or the beta-gamma pyrophosphate moiety from nucleotide triphosphate precursors to substrates to create phosphorylated products. The use of &#947;-32-P labeled NTP precursors allows simultaneous monitoring of substrate utilization and product formation by radiography. Thin layer chromatography (TLC) on cellulose plates allows rapid separation and sensitive quantification of substrate and product. We present a method for utilizing the thin-layer chromatography to assay the pyrophosphokinase activity of a purified (p)ppGpp synthetase. This method has previously been used to characterize the activity of cyclic nucleotide and dinucleotide synthetases and is broadly suitable for characterizing the activity of any enzyme that hydrolyzes a nucleotide triphosphate bond or transfers a terminal phosphate from a phosphate donor to another molecule.

A Purification and In Vitro Activity Assay for a pppGpp Synthetase from Clostridium difficile

Here, we describe a method for purifying histidine-tagged pyrophosphokinase enzymes and utilizing thin layer chromatography of radiolabelled substrates and products to assay for the enzymatic activity in vitro. The enzyme activity assay is broadly applicable to any kinase, nucleotide cyclase, or phosphor-transfer reaction whose mechanism includes nucleotide triphosphate hydrolysis.

Bir arınma ve In Vitro etkinliği tahlil için (p) ppGpp sentetaz Clostridium difficile üzerinden

Kinase and pyrophosphokinase enzymes transfer the gamma phosphate or the beta-gamma pyrophosphate moiety from nucleotide triphosphate precursors to ...

İmmünoloji ve Enfeksiyon

High-throughput Purification of Affinity-tagged Recombinant Proteins

X-ray crystallography is the method of choice for obtaining a detailed view of the structure of proteins. Such studies need to be complemented by further biochemical analyses to obtain detailed insights into structure/function relationships. Advances in oligonucleotide- and gene synthesis technology make large-scale mutagenesis strategies increasingly feasible, including the substitution of target residues by all 19 other amino acids. Gain- or loss-of-function phenotypes then allow systematic conclusions to be drawn, such as the contribution of particular residues to catalytic activity, protein stability and/or protein-protein interaction specificity.
In order to attribute the different phenotypes to the nature of the mutation - rather than to fluctuating experimental conditions - it is vital to purify and analyse the proteins in a controlled and reproducible manner. High-throughput strategies and the automation of manual protocols on robotic liquid-handling platforms have created opportunities to perform such complex molecular biological procedures with little human intervention and minimal error rates1-5.
Here, we present a general method for the purification of His-tagged recombinant proteins in a high-throughput manner. In a recent study, we applied this method to a detailed structure-function investigation of TFIIB, a component of the basal transcription machinery. TFIIB is indispensable for promoter-directed transcription in vitro and is essential for the recruitment of RNA polymerase into a preinitiation complex6-8. TFIIB contains a flexible linker domain that penetrates the active site cleft of RNA polymerase9-11. This linker domain confers two biochemically quantifiable activities on TFIIB, namely (i) the stimulation of the catalytic activity during the 'abortive' stage of transcript initiation, and (ii) an additional contribution to the specific recruitment of RNA polymerase into the preinitiation complex4,5,12 . We exploited the high-throughput purification method to generate single, double and triple substitution and deletions mutations within the TFIIB linker and to subsequently analyse them in functional assays for their stimulation effect on the catalytic activity of RNA polymerase4. Altogether, we generated, purified and analysed 381 mutants - a task which would have been time-consuming and laborious to perform manually. We produced and assayed the proteins in multiplicates which allowed us to appreciate any experimental variations and gave us a clear idea of the reproducibility of our results.
This method serves as a generic protocol for the purification of His-tagged proteins and has been successfully used to purify other recombinant proteins. It is currently optimised for the purification of 24 proteins but can be adapted to purify up to 96 proteins.

We describe a method for the affinity-tagged purification of recombinant proteins using liquid-handling robotics. This method is generally applicable to the small-scale purification of soluble His-tagged proteins in a high-throughput format.

Affinity etiketli Rekombinant Proteinler Yüksek throughput Arıtma

X-ray crystallography is the method of choice for obtaining a detailed view of the structure of proteins. Such studies need to be complemented by further ...

Massively Parallel Reporter Assays in Cultured Mammalian Cells

The genetic reporter assay is a well-established and powerful tool for dissecting the relationship between DNA sequences and their gene regulatory activities. The potential throughput of this assay has, however, been limited by the need to individually clone and assay the activity of each sequence on interest using protein fluorescence or enzymatic activity as a proxy for regulatory activity. Advances in high-throughput DNA synthesis and sequencing technologies have recently made it possible to overcome these limitations by multiplexing the construction and interrogation of large libraries of reporter constructs. This protocol describes implementation of a Massively Parallel Reporter Assay (MPRA) that allows direct comparison of hundreds of thousands of putative regulatory sequences in a single cell culture dish.

The genetic reporter assay is a well-established and powerful tool for dissecting the relationship between DNA sequences and their gene regulatory activities. Coupling candidate regulatory elements to reporter genes that carry identifying sequence tags enables massive parallelization of these assays.

Kültürlenmiş memeli hücrelerinde büyük çapta paralel Raportör Tahliller

The genetic reporter assay is a well-established and powerful tool for dissecting the relationship between DNA sequences and their gene regulatory ...

Plasmid Stability Analysis with Open-Source Droplet Microfluidics

Plasmids play a vital role in synthetic biology by enabling the introduction and expression of foreign genes in various organisms, thereby facilitating the construction of biological circuits and pathways within and between cell populations. For many applications, maintaining functional plasmids without antibiotic selection is critical. This study introduces an open-hardware-based microfluidic workflow for analyzing plasmid retention by culturing single cells in gel microdroplets and quantifying microcolonies using fluorescence microscopy. This approach allows for the parallel analysis of numerous droplets and microcolonies, providing greater statistical power compared to traditional plate counting and enabling the integration of the assay into other droplet microfluidic workflows. By using plasmids expressing fluorescent proteins alongside a non-specific fluorescent DNA stain, single colonies can be identified and differentiated based on plasmid loss or fluorescent marker expression. Notably, this advanced workflow, implemented with open-source hardware, offers precise flow control and temperature management of both the sample and the microfluidic chip. These features enhance the workflow&#39;s ease of use, robustness, and accessibility. While the study focuses on Escherichia coli as the experimental model, the method&#39;s true potential lies in its versatility. It can be adapted for various studies requiring fluorescence signal quantification from plasmids or stains, as well as for other applications. The adoption of open-source hardware broadens the potential for conducting high-throughput bioanalyses using accessible technology in diverse research settings.

An accessible, open-source microfluidic workflow is presented for the parallelized analysis of plasmid retention in bacteria. By employing fluorescence microscopy to quantify plasmid presence in single-cell microcolonies within gel microdroplets, this method provides a precise, accessible, and scalable alternative to traditional plate counting.

Açık Kaynak Damlacık Mikroakışkanları ile Plazmid Stabilite Analizi

Plasmids play a vital role in synthetic biology by enabling the introduction and expression of foreign genes in various organisms, thereby facilitating ...

Biyomühendislik

Use of In Vivo Assembly for High-efficiency Plasmid Construction

In vivo assembly (IVA) is a molecular cloning method that uses intrinsic enzymes present in bacteria that promote intermolecular recombination of DNA fragments to assemble plasmids. This method functions by transforming DNA fragments with regions of 15-50 bp of homology into commonly used laboratory Escherichia coli strains and the bacteria use the RecA-independent repair pathway to assemble the DNA fragments into a plasmid. This method is more rapid and cost-effective than many molecular cloning methods that rely on in vitro assembly of plasmids prior to transformation into E. coli strains. This is because in vitro methods require the purchase of specialized enzymes and the performance of sequential enzymatic reactions that require incubations. However, unlike in vitro methods, IVA has not been experimentally shown to assemble linear plasmids. Here we share the IVA protocol used by our laboratory to rapidly assemble plasmids and subclone DNA fragments between plasmids with different origins of replication and antibiotic resistance markers.

In vivo assembly is a ligation-independent cloning method that relies on intrinsic DNA repair enzymes in bacteria to assemble DNA fragments by homologous recombination. This protocol is both time and cost-effective, as few reagents are required, and cloning efficiency can be as high as 99 %.

Yüksek Verimli Plazmid Yapımı için In Vivo Montaj Kullanımı

In vivo assembly (IVA) is a molecular cloning method that uses intrinsic enzymes present in bacteria that promote intermolecular recombination of DNA ...

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

DNA nanotechnology requires large amounts of highly pure DNA as an engineering material. Plasmid DNA could meet this need since it is replicated with high fidelity, is readily amplified through bacterial culture and can be stored indefinitely in the form of bacterial glycerol stocks. However, the double-stranded nature of plasmid DNA has so far hindered its efficient use for construction of DNA nanostructures or devices that typically contain single-stranded or branched domains. In recent work, it was found that nicked double stranded DNA (ndsDNA) strand displacement gates could be sourced from plasmid DNA. The following is a protocol that details how these ndsDNA gates can be efficiently encoded in plasmids and can be derived from the plasmids through a small number of enzymatic processing steps. Also given is a protocol for testing ndsDNA gates using fluorescence kinetics measurements. NdsDNA gates can be used to implement arbitrary chemical reaction networks (CRNs) and thus provide a pathway towards the use of the CRN formalism as a prescriptive molecular programming language. To demonstrate this technology, a multi-step reaction cascade with catalytic kinetics is constructed. Further it is shown that plasmid-derived components perform better than identical components assembled from synthetic DNA.

This protocol describes a method for deriving DNA strand displacement gates from plasmids and testing them using fluorescence kinetics measurements. Gates can be modularly composed into multi-component systems to approximate the behavior of formal chemical reaction networks (CRN), demonstrating a new use for CRNs as a molecular programming language.

Plazmid kökenli Uygulama Kimyasal Reaksiyon Ağları için DNA Strand Deplasman kapıları

DNA nanotechnology requires large amounts of highly pure DNA as an engineering material. Plasmid DNA could meet this need since it is replicated with high ...

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Extrachromosomal circular DNAs (eccDNAs) are common genetic elements in Saccharomyces cerevisiae and are reported in other eukaryotes as well. EccDNAs contribute to genetic variation among somatic cells in multicellular organisms and to evolution of unicellular eukaryotes. Sensitive methods for detecting eccDNA are needed to clarify how these elements affect genome stability and how environmental and biological factors&#160;induce their formation in eukaryotic cells. This video presents a sensitive eccDNA-purification method called Circle-Seq. The method encompasses column purification of circular DNA, removal of remaining linear chromosomal DNA, rolling-circle amplification of eccDNA, deep sequencing, and mapping. Extensive exonuclease treatment&#160;was&#160;required for sufficient linear chromosomal DNA degradation. The rolling-circle amplification step by &#966;29 polymerase enriched for circular DNA over linear DNA. Validation of the Circle-Seq method on three S. cerevisiae CEN.PK populations of 1010 cells detected hundreds of eccDNA profiles in sizes larger than 1 kilobase. Repeated findings of ASP3-1, COS111, CUP1, RSC30,&#160;HXT6, HXT7 genes on circular DNA in both S288c and CEN.PK suggests that DNA circularization is conserved between strains at these loci. In sum, the Circle-Seq method has broad applicability for genome-scale screening for eccDNA in eukaryotes as well as for detecting specific eccDNA types.

This paper presents a sensitive method called Circle-Seq for purifying extrachromosomal circular DNA (eccDNA). The method encompasses column purification, removal of remaining linear chromosomal DNA, rolling-circle amplification and high-throughput sequencing. Circle-Seq is applicable to genome-scale screening of eukaryotic eccDNA and studying genome instability and copy-number variation.

Ökaryotik Hücrelerde gelen ekstrakromozomal dairesel DNA genom Arıtma

Extrachromosomal circular DNAs (eccDNAs) are common genetic elements in Saccharomyces cerevisiae and are reported in other eukaryotes as well. EccDNAs ...

CAPRRESI: Chimera Assembly by Plasmid Recovery and Restriction Enzyme Site Insertion

Here, we present chimera assembly by plasmid recovery and restriction enzyme site insertion (CAPRRESI). CAPRRESI benefits from many strengths of the original plasmid recovery method and introduces restriction enzyme digestion to ease DNA ligation reactions (required for chimera assembly). For this protocol, users clone wildtype genes into the same plasmid (pUC18 or pUC19). After the in silico selection of amino acid sequence regions where chimeras should be assembled, users obtain all the synonym DNA sequences that encode them. Ad hoc Perl scripts enable users to determine all synonym DNA sequences. After this step, another Perl script searches for restriction enzyme sites on all synonym DNA sequences. This in silico analysis is also performed using the ampicillin resistance gene (ampR) found on pUC18/19 plasmids. Users design oligonucleotides inside synonym regions to disrupt wildtype and ampR genes by PCR. After obtaining and purifying complementary DNA fragments, restriction enzyme digestion is accomplished. Chimera assembly is achieved by ligating appropriate complementary DNA fragments. pUC18/19 vectors are selected for CAPRRESI because they offer technical advantages, such as small size (2,686 base pairs), high copy number, advantageous sequencing reaction features, and commercial availability. The usage of restriction enzymes for chimera assembly eliminates the need for DNA polymerases yielding blunt-ended products. CAPRRESI is a fast and low-cost method for fusing protein-coding genes.

Here, we present chimera assembly by plasmid recovery and restriction enzyme site insertion (CAPRRESI), a protocol based on the insertion of restriction enzyme sites into synonym DNA sequences and functional plasmid recovery. This protocol is a fast and low-cost method for fusing protein-coding genes.

CAPRRESI: Plazmid Geri Kazanım ve Kısıtlama Enzim Yerinin Eklenmesi ile Chimera Meclisi

Here, we present chimera assembly by plasmid recovery and restriction enzyme site insertion (CAPRRESI). CAPRRESI benefits from many strengths of the ...