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25 protocols using in fusion snap assembly master mix

1

Chikungunya virus nsP4 expression and purification

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The gene fragment of CHIKV nsP4 was amplified from the genomic RNA of the CHIKV Asian strain (GenBank OK316992), and then cloned into the mammalian expression vector using In-Fusion Snap Assembly Master Mix (TaKaRa, Shiga, Japan). The coding sequence for nsP4 RdRp was optimized and chemically synthesized by GENEWIZ (Suzhou, China), and inserted into the eukaryotic expression vector pMD2.GΔVSV (the original plasmid pMD2.G after the removal of VSV gene was used as the carrier plasmid) or prokaryotic expression vector pGEX-6P-1 using In-Fusion Snap Assembly Master Mix (TaKaRa, Dalian, China).
CHIKV nsP4 was expressed in 6-well plates. A total of 1×10 6
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2

Establishment of CrCOMT Transgenic Tobacco

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The CrCOMT sequence was acquired based on a previous report (Zhang et al., 2019 (link)). First, pCAMBIA3301 was constructed as the expression vector (NcoI/BglII) using In-Fusion® Snap Assembly Master Mix (Takara, China) (Primer: CrCOMT-p3301-S/CrCOMT-p3301-A). The recombinant vector pCAMBIA3301-CrCOMT was introduced into Agrobacterium tumefaciens strain EHA105. Tobacco agrobacterium-mediated transformation was performed with tobacco leaf disk infiltration, according to the protocol in Gallois and Marinho’s study (Gallois and Marinho, 1995 (link)). T0 transgenic tobacco seeds were selected on 1/2 MS medium containing phosphinothricin (50 mg/L). Positive transgenic seedlings were identified using PCR (Primer: 35S-specific-S/CrCOMT-specific-A). Then, qRT-PCR was performed, transgenic tobacco plants with high expression were selected (Primer: qCrCOMT-S/qCrCOMT-A), and homozygous T3 seeds were used for further experiments. The primers used in PCR and qRT-PCR were designed using Primer 5 software and detailed sequence were shown in Supplementary Table 1.
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3

Cloning and Expression of C. japonica Tropomyosin

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The C. japonica tropomyosin gene was PCR amplified using appropriate primers (5′-CATCATCATCATCATATGGATGCCATCAAGAAGAA-3′ and 5′-TATCTAGACTGCAGGTTAATACCCAGCCAATTCAG-3′). The amplicons were cloned into the pColdII expression vector to create pColdII-tropomyosin with a His-tag using the In-fusion® Snap Assembly master mix (Takara Bio Inc., Shiga, Japan) according to the manufacturer’s instructions. The construct was sequenced for confirmation and then transformed into E. coli BL21 (DE3) cells for the production of His6-tagged (N-terminus) C. japonica tropomyosin.
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4

Lentiviral Cloning of HSPA9 Gene

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HSPA9 was cloned into lentiviral pLEX donor vector using In-Fusion Snap Assembly Master Mix (Takara) as per manufacturer recommendations. HSPA9 insert was PCR amplified from HSPA9 cDNA (Human ORFeome library v8.1 (Access provided by UCSF Recombinant Antibody Network) and pLEX donor vector was digested using BAMHI-HF (NEB). Insert and vector were gel purified prior to In-Fusion cloning reaction and transformation into Stellar Competent Cells (Takara). For cloning primers see Table S3.
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5

Rapid Amplification of cDNA Ends for Transcript Discovery

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Total RNAs were isolated with Trizol reagent. RACE-ready first-strand cDNA were performed with 1μg total RNAs using the SMARTer RACE 5′/3′ Kit (Takara Bio) according to the manufacturer’s instructions. The 5′- and 3′-RACE PCR reactions (including PCR Master Mix, SeqAmp DNA Polymerase, 5′- or 3′-RACE-ready cDNA, 5′ or 3′ GSP, UPM, SeqAmp Buffer, and four dNTPs) were performed on LightCycler480 II (Roche) following the manufacturer’s instructions (Takara Bio). The PCR programs are shown in Table S3. RACE PCR products were separated on a 1% agarose gel and extracted with the NuceloSpin Gel and PCR Clean-Up Kit (Takara Bio). Then, the DNA products were subcloned into pGH-T vectors (GV0108-C, Shanghai Generay Biotech Co., Ltd.) using In-Fusion Snap Assembly Master Mix (Takara Bio) for 15 min at 50°C and then sequenced bidirectionally using gene specific primers (Sagene) (Table S4). RNA integrity was determined with a Bioanalyzer 2100 using RNA 6000 nanochips (Agilent). DNA quantity was assessed using a NanoDrop One C spectrophotometer (Thermo Fisher Scientific). The full-length nucleotide sequence of lnc-HZ09 is shown in Table S5.
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6

Minigene Splicing Assay for NPR2 Variant

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The wild-type (WT) human NPR2 cDNA was obtained from NCBI. To confirm the possible consequences of the splice site variant, an in vitro analysis was performed using a minigene splicing assay based on the pSPL3 exon trapping vector (Invitrogen) [17 ]. The minigene included the 169-bp exon 15, the 147-bp exon 16, the 124-bp exon 17, the 69-bp exon 18, and the introns of 15, 16, 17 and 18. The minigene sequence was then inserted into the multiple cloning site of the pSPL3 vector (restriction sites: EcoRI and BamHI). The pSPL3-WT plasmid contained the gene of interest. Subsequently, the c.2643G > A variant was introduced into the sequence using PCR with mutagenic primers (5’-CCCATGCAAGTGAGAGCCAT-3’), and the PCR products were ligated using the In-Fusion® Snap Assembly Master Mix (TaKara, Beijing, China).
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7

Cloning and Sequencing of Potato NHX and CHX Genes

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Plant material accession A056 was utilized for total RNA extraction and reverse transcription polymerase chain reaction to generate cDNA sequences (an identical method to the described qPCR procedure). Primers were designed based on the CDS of StNHX1, StNHX2, StNHX3, StNHX5, StNHX6, StNHX7, and StCHX19 from potato DM genomes. Detailed primer sequences can be found in Supplementary Table S2. In order to clone the coding region sequences of the StNHX1, StNHX2, StNHX3, StNHX5, StNHX6, StNHX7, and StCHX19 genes, the cDNA of the A056 material was employed as a template for PCR amplification using the Supplementary Table S2 primers. The sequences of the StNHX1, StNHX2, StNHX3, StNHX5, StNHX6, StNHX7, and StCHX19 genes were amplified and inserted into the P416 vector using the seamless cloning method (In-Fusion® Snap Assembly Master Mix) (TaKaRa). Finally, vector construction was verified by sequencing. The constructed vectors included P416-StNHX1, P416-StNHX2, P416-StNHX3, P416-StNHX5, P416-StNHX6, P416-StNHX7, and P416-StCHX19.
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8

Plasmid Construction Methods Comparison

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The plasmids used in this study are listed in Table S3. Plasmids were constructed using a conventional cloning method with restriction endonucleases and T4 DNA ligase, the gap repair cloning method (51 (link), 52 (link)), In-Fusion cloning using an In-Fusion Snap Assembly Master Mix (Takara Bio Inc), or a seamless cloning method described by Liu et al. (53 (link)). Oligonucleotide primers used for plasmid constructions were listed in Table S4. DNA fragments used for plasmid construction via gap repair cloning and seamless cloning were listed in Tables S5 and S6, respectively. The detailed methods for the preparation of individual plasmids are described in the Supporting Information.
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9

Genetically Engineered Zebrafish Biosensors

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The fabp10-GRABATP and fabp10-GRABAdo plasmids were constructed using PCR with KOD plus Neo (Toyobo) and In-Fusion Snap Assembly Master Mix (Takara) to produce vectors with Tol2 transposon sites. For fabp10-GRABATP/-GRABAdo, the promoter sequence for hepatocytes was amplified using PCR and used to replace elavl3-GRABATP/-GRABAdo. Multisite Gateway cloning was performed with the destination vector pDestTol2, the 5′-entry vector containing the fabp10 promoter, the middle entry vector containing pME-mCherry, and the 3′-entry vector containing p3E-polyA. Fabp10:mCherry was used to create fabp10 promoter elements. The zebrafish strains used were as follows: wild-type (AB strain; ZFIN, Eugen, OR, USA), fabp10-GRABATP, and fabp10-GRABAdo. The plasmid was injected along with the transposon into the one-cell-stage embryo of wild-type zebrafish, as described previously49 (link). The plasmid insertion was confirmed by observing heart mCherry in 2 dpf larvae. Injected embryos were raised, and adult zebrafish 2 mpf were identified by amplifying the EGFP gene using PCR with the primers listed in Table 1. They were then outcrossed with wild-type zebrafish to obtain the next generation. Further, to confirm GFP expression in GRAB zebrafish, GRABATP and GRABAdo larvae were embedded in E3 medium with ATP (5 mM) or Ado (6 mM) solutions. Live images were captured as described below.
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10

Heterologous Expression of P. sojae Genes

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PsAF5, PsPHB2, PsATG8, PsMC, PsCytc, PsAIF B, PsRab5, PsRab7, and SKL genes were amplified from P. sojae cDNA and ligated into pYF3 (G418) or pYF3OX (oxathiapiprolin) using In-Fusion Snap Assembly Master Mix (Takara) to express them as Flag, Myc, GFP, BFP, His, HA or mCherry fusion proteins. The amplified primer information is provided in Supplementary Table 10, and the tag sequences are provided in Supplementary Table 11. Mitochondrial targeting signal (MTS) sequences were amplified from P. infestans β-ATPase and ligated to pYF3 through enzymatic digestion to generate pYF3-MTS-mCherry, pYF3-MTS-GFP, and pYF3-MTS-mCherry-GFP constructs43 (link). The Flag-PsAF5ΔANK and Flag-PsAF5ΔFYVE constructs were expressed in pYF3 and verified through PCR and western blot. Supplementary Table 12 lists all primers used for PsAF5 mutant vector construction.
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