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17 protocols using high fidelity dna polymerase

1

Amplification and Analysis of PpMYB36 Gene

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The names and sequences of primers used for amplification of the PpMYB36 genomic sequence are given in Supplementary Table 5. DNA fragments were amplified using high-fidelity DNA polymerase (Takara) using reaction conditions recommended by the manufacturer. The PCR products were purified and cloned into the PMD 19-T vector (Takara). Nucleotide sequences of 10 independent clones of each fragment per sample were determined. BLAST analysis of the amino acid sequence of PpMYB36 was performed in the Arabidopsis information resource,5 and a phylogenetic tree was constructed using MEGA 5.2 (Tamura et al., 2011 (link)). Promoter sequence analysis was performed using the PlantCARE online database.6
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2

Characterization of Expansin Proteins from Cereal Nematode

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The putative effectors were selected from H. avenae transcript libraries. Signal peptides were predicted using signalP 4.1 (http://www.cbs.dtu.dk/services/SignalP/)68 (link), and putative transmembrane helices were predicted by TMHMM Server v.2.0
(http://www.cbs.dtu.dk/services/TMHMM/). The open reading frames were predicted by ORF Finder (http://www.ncbi.nlm.nih.gov/projects/gorf/gorf.html). The coding sequences of candidate genes were amplified with high-fidelity DNA polymerase (TaKaRa, Japan). Then, the coding sequences were cloned into the plant expression vector pYBA1143 using restriction enzyme sites. The HaEXPB2 coding sequences with and without signal peptide were amplified using gene-specific primers containing BamHI and HindIII restriction enzyme sites. The HaEXPB2Δ260-289 sequence was amplified using HaEXPB2F (BamHI)/HaEXPB2R1 (Hind III). HaEXPB2Δ117-289 sequence was amplified using HaEXPB2F (BamHI)/HaEXPB2R3 (Hind III). The sequence of HaEXPB2ΔCBD, HaEXPB2ΔDPBB, and HaEXPB2Δ117-232 were amplified using HaEXPB2-4R/HaEXPB2-4F, HaEXPB2-5R/HaEXPB2-5F, HaEXPB2-6R/HaEXPB2-6F and HaEXPB2F (BamHI)/HaEXPB2R1 (Hind III) by overlapping PCR, respectively (Supplementary Table 2). The resulting amplified fragments were cloned into the respective sites in the modified pYBA1143 vector, which contained an HA tag. All constructs in this study were confirmed by sequencing.
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3

FISH Assay for lncTCF7 Detection

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SNHG1 cDNA fragments were amplified from the SNHG1 plasmid as templates by utilizing high fidelity DNA polymerase (Takara, Kyoto, Japan). Based on this template, fluorescein-labeled lncTCF7 FISH probe DNA was prepared with fluorescein-12-dUTP (Roche, Mannheim, Germany) and Klenow DNA polymerase (Vazyme, Nanjing, China) as per the manufacturer’s protocol. Then, 4-µm frozen sections were made from bladder cancer tissues and adjacent normal tissues. Subsequent to 5-min immersion in proteinase K (MCE, NJ, USA), the slides were washed twice in 2× saline sodium citrate (SSC) (Merck KGaA, Darmstadt, Germany). The FISH hybridization solution encompassing 30 ng/µL lncTCF7 FISH probe DNA (Beijing Dingguo Changsheng Biotechnology Co., Ltd., Beijing, China) was dripped onto the tissue sections before 16-h incubation at 37 °C. The slides were then washed in 0.4 × SSC/0.001% NP-40 (Merck KGaA, Darmstadt, Germany) for 5 min at 56 °C, followed by another 2-min washing in 0.4 × SSC/0.001% NP-40. After being dripped with 4′,6-Diamidino-2-Phenylindole (DAPI)-encompassing sealing agent, the slide was mounted and observed under a fluorescence microscope (Olympus, Tokyo, Japan).
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4

DNA Extraction and Cux-1 Gene PCR

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DNA of each clinical samples were extracted using TIANamp Genomic DNA Kit (Tiangen Biotechnology Co., Ltd., China) following the manufacturer's instructions and then detected by PCR. The sequence of primers was designed based on the Cux-1 sequence (accession NO. M55918) and shown in Table 1. PCR was performed in a 25 μl reaction volume containing 0.5 μl forward primers and downstream primers (10 mM), 1 μl DNA, 2.5 μl buffer, 2 μl dNTPs (2.5 mM), 0.5 μl high fidelity DNA polymerase (TaKaRa Bio, Inc., Dalian, China), and 18 μl deionized water. The PCR reaction conditions were as following: 98°C pre-denaturation for 1 min, followed by 98°C denaturation for 10 s, 56°C annealing for 1 min, and 72°C extension for 30 s; The extension was carried out for another 10 min before terminating the reaction at 4°C. PCR products were analyzed by 1% agarose gel electrophoresis.
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5

Engineered Eno1 Mutants in 293T Cells

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The full length open reading frame of Eno1 was amplified by PCR with a high-fidelity DNA Polymerase (Takara, Japan) using the following primers: F: 5′-AGAGAATTC GGATCCATGTCTATTCTCAAGATCCATG-3′, and R: 5′-CTTCCATGGCTC GAGTTACTTGGCCAAGGGGTTTC-3′. The purified fragment was cloned into eukaryotic expression plasmid pCDNA3.1 N-Flag by In-Fusion (Clontech, China) and verified by Sanger sequencing. Site-Directed Mutagenesis (NEB, USA) was used to generate point mutations in pCDNA3.1-Eno1 (C119A, C339A, C357A, and C389A) using the following primers: C119A_F: 5′-CCTTGCCGTCgcCAAAGCTGGTGC-3′, C119A_R: 5′-GACACCCCCAGAATGGCG-3′; C339A_F: 5′-GTCCTGCAACgcCCTCCTGCTC-3′, C339A_R: 5′-TTCTCGTTCACGGCCTTG-3′; C357A_F: 5′-TCTTCAGGCGGCCAAGCTGGCCC-3′, C357A_R: 5′-GACTCGGTCACGGAGCCA-3′; C389A_F: 5′-TGTGGGGCTGGCCACTGGGCAG-3′, C389A_R: 5′-ACCAGGTCAGCGATGAAG-3′. The wild-type or mutant plasmids were transfected into 293 T cells using Lipofectamine 2000, and the expression of Flag-tagged proteins were analyzed by immunoblotting after 48 h.
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6

Visualizing lncTCF7 expression in DLD1 cells

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A fragment of a 550-bp lncTCF7 cDNA was amplified from the lncTCF7 plasmid by using a high-fidelity DNA polymerase (Takara) as the DNA template. From this template, a fluorescein-labeled DNA as the lncTCF7 FISH probe was made with PCR Fluorescein Labeling Mix (Roche, Basel, Switzerland). DLD1 cells were cultured on slides treated with or without 100 nM 1,25(OH)2D3 for 48 h. The slide was soaked in proteinase K for 5 min and washed in 2× SSC twice. A FISH hybridization solution (Dingguochangsheng, Beijing, P.R. China) containing 30 ng/μl lncTCF7 FISH probe DNA was applied to the slide, which was subsequently incubated at 37°C for 16 h. The slide was then washed in 0.4× SSC/0.001% NP-40 at 560°C for 5 min followed by a second wash in 2× SSC/0.0001% NP-40 for another 2 min. The slide was covered with a drop of mounting medium containing DAPI and visualized using a Fluoview 1000 confocal microscope (Olympus).
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7

Recombinant DNA Cloning Protocol

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High-fidelity DNA polymerase, restriction endonucleases (BamHI, SalI), and dNTPs were purchased from TaKaRa (Kunming, China). The plasmid mini-prep kit and DNA gel extraction kit were procured from Omega (Kunming, China). A one-step cloning kit was purchased from Vazyme Biotech (Nanjing, China). The Fast MultiSite Mutagenesis System, Escherichia coli Trans I-T1, and DMT cells were obtained from TransGen (Beijing, China). All other chemicals were of an analytical grade and commercially available.
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8

DNA Barcoding with cox1 Amplification

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All specimens submitted for cox1 amplification were processed individually. A 5.5-µl aliquot of nucleic acid from each specimen was added to a 30-µl reaction volume containing PrimeSTAR HS DNA Polymerase, a high-fidelity DNA polymerase (Takara Bio), and amplified according to Duan et al. [14 (link), 15 (link)].
The DNA products were sent to Kunming Shuoqing Biological Technology Company (Kunming, China) for sequencing. Cox1 sequences were queried for best matched species in the National Center for Biotechnology Information (NCBI) and Barcode of Life Data System (BOLD) databases.
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9

Fluorescent In-Situ Hybridization of lncTCF7

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A fragment of 550 bp lncTCF7 cDNA was amplified from the lncTCF7 plasmid by using a high fidelity DNA polymerase (Takara) as the DNA template. From this template, a fluorescein labeled DNA as the lncTCF7 FISH probe was made with fluorescein-12-dUTP (Roche) and Klenow DNA polymerase following the manufacturer's protocol. CRC tissue with its adjacent normal tissue embedded in OCT (Sakura Finetek, Inc., Torrance, CA, USA) was cut to sections of 4 µm thickness. The slide was soaked in proteinase K for 5 min and washed in 2× SSC twice. A FISH hybridization solution (Beijing Dingguo Changsheng Biotechnology Co., Ltd., Beijing, China) containing 30 ng/µl lncTCF7 FISH probe DNA was applied to the slide which was subsequently incubated at 37°C for 16 h. The slide was then washed in 0.4× SSC/0.001% NP-40 at 560C for 5 min followed by a second wash in 2× SSC/0.0001% NP-40 for another 2 min. The slide was covered with a drop of mounting medium containing DAPI, and observed under a fluorescence microscope.
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10

Plasmid Construction by Golden Gate, Gibson, and CPEC

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Primers (Table S2) used for the construction of plasmids (Table S3) in this study were designed using j5 Device Editor [20 (link)]. The other primers were designed using Clonemanager software. High fidelity DNA polymerase was purchased from Takara (Dalian, China) or New England Biolabs (USA). BsaI restriction endonuclease and T4 ligase were purchased from New England Biolabs (USA) and Thermo-Fisher Scientific (USA), respectively. Plasmids were constructed using Golden Gate [21 (link)], Gibson [22 (link)] or CPEC [23 (link)] methods, and used to transform E. coli or R. eutropha. Plasmids were extracted using the AxyPrep Plasmid Miniprep Kit (AXYGEN, China) according to the manufacturer’s instructions, with minor modifications.
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