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9 protocols using ptrchisa vector

1

Generating Antibodies and Antisera

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Mouse monoclonal anti-β-actin (Sigma), rabbit polyclonal anti-lamin B1 (MBL), rabbit polyclonal anti-DDDDK-tag (FLAG tag; MBL), mouse monoclonal anti-HA-tag (Sigma), HRP conjugated anti-mouse IgG (Sigma), HRP conjugated anti-rabbit IgG (Sigma), CF488 goat anti-mouse IgG (Biotium), and CF594 goat anti-rabbit IgG (Biotium) antibodies were used for immunoblotting and immunofluorescence. To generate NBV σA, σC, σNS, and μNS antisera, ORFs expressing these proteins were cloned into the pTrcHisA vector (Life Technologies). Plasmids were transformed into the E. coli BL21 strain, and recombinant proteins were expressed and purified. The proteins were mixed with 2% Alhydrogel adjuvant (Invivogen) and subcutaneously inoculated into ICR mice (CLEA Japan). Anti-NBV p17 antiserum was obtained by rabbit immunization with 125–138 residues of NBV p17 (Sigma).
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2

Generating Antiserum Against Viral Strains

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To generate antiserum against strain MB σC, the σC coding region of the MB S1 gene was cloned downstream of sequences encoding poly-histidine (His) tag in the pTrcHisA vector (Life Technologies). The His-σC fusion protein expressed in BL21 cells (Takara) was purified from the soluble fraction using His-Select R Nickel Affinity Gel (Sigma) according to the manufacturer’s instructions. The His-σC fusion protein was mixed with Alhydrogel adjuvant 2% (InvivoGen) according to the manufacturer’s instructions, and ICR mice (CLEA Japan) were immunized and boosted with the protein-adjuvant mixture to generate σC-specific serum. Antiserum was obtained 4 weeks after administration of the last booster. To generate antiserum against strain MB, virions were mixed with Alhydrogel adjuvant 2% according to the manufacturer’s instructions, and mice were immunized and boosted with the virus-adjuvant mixture. Antiserum was obtained 4 weeks after administration of the last booster.
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3

Stable Isotope Labeling of Ras Proteins

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13C6-15N2-lysine (+8 Da) and 13C6-15-N4-arginine (+10 Da) were obtained from Sigma. His-tagged, wild-type KRAS4B and NRAS plasmids were kindly provided by Ignacio Rubio (Institute of Molecular Cell Biology, University of Jena). Wild-type, full-length human HRAS and KRAS4A sequences were sub-cloned into the pTrcHis A vector (Invitrogen) from plasmids described in [23 (link), 24 (link)] and sequence verified.
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4

Cloning and Characterization of clbH Gene

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Linearized pTrcHisA vector was PCR amplified from pTrcHisA vector (Invitrogen) using primers shown in Supplementary Table 4. Full-length clbH, truncated clbH (clbH-C-A2-PCP), and two adjacent genes clbH and clbI (clbH-clbI) were PCR amplified from E. coli CFT073 genomic DNA (ATCC) using primers shown in Supplementary Table 4. PCR reactions (20 μL) contained 10 μL Q5 High-Fidelity 2× Master Mix (New England Biolabs), 1 ng of DNA template, and 500 pmoles of each primer. Thermocycling was carried out in a MyCycler gradient cycler (Bio-rad) using the following condition: denaturation for 1 min at 98 °C, followed by 35 cycles of 10 sec at 98 °C, 30 sec at 72 °C, 3 min for clbH (2 min for clbH-C-A2-PCP and 4 min for clbH-clbI) at 72 °C, and a final extension of 5 min at 72 °C.
Gibson assembly reactions (10 μL) contained 100 ng linearized pTrcHisA vector, 3-fold of molar excess purified PCR products of clbH, clbH-C-A2-PCP, or clbH-clbI, and 5 μL of 2× Gibson Assembly Master Mix (New England Biolabs). The mixtures were incubated at 50 °C for 15 min and used to transform 50 μL of chemically competent E. coli TOP10 cells (Invitrogen). The identity of the assembled plasmids was confirmed by sequencing.
The pTrcHisA-clbH, -clbH-C-A2-PCP, and -clbH-clbI plasmids were electroporated into electrocompetent E. coli DH10B BACpksΔclbDtoMΔclbOtoQ and stored at −80 °C as frozen LB/glycerol stocks.
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5

Cloning and Characterization of clbH Gene

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Linearized pTrcHisA vector was PCR amplified from pTrcHisA vector (Invitrogen) using primers shown in Supplementary Table 4. Full-length clbH, truncated clbH (clbH-C-A2-PCP), and two adjacent genes clbH and clbI (clbH-clbI) were PCR amplified from E. coli CFT073 genomic DNA (ATCC) using primers shown in Supplementary Table 4. PCR reactions (20 μL) contained 10 μL Q5 High-Fidelity 2× Master Mix (New England Biolabs), 1 ng of DNA template, and 500 pmoles of each primer. Thermocycling was carried out in a MyCycler gradient cycler (Bio-rad) using the following condition: denaturation for 1 min at 98 °C, followed by 35 cycles of 10 sec at 98 °C, 30 sec at 72 °C, 3 min for clbH (2 min for clbH-C-A2-PCP and 4 min for clbH-clbI) at 72 °C, and a final extension of 5 min at 72 °C.
Gibson assembly reactions (10 μL) contained 100 ng linearized pTrcHisA vector, 3-fold of molar excess purified PCR products of clbH, clbH-C-A2-PCP, or clbH-clbI, and 5 μL of 2× Gibson Assembly Master Mix (New England Biolabs). The mixtures were incubated at 50 °C for 15 min and used to transform 50 μL of chemically competent E. coli TOP10 cells (Invitrogen). The identity of the assembled plasmids was confirmed by sequencing.
The pTrcHisA-clbH, -clbH-C-A2-PCP, and -clbH-clbI plasmids were electroporated into electrocompetent E. coli DH10B BACpksΔclbDtoMΔclbOtoQ and stored at −80 °C as frozen LB/glycerol stocks.
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6

Cloning and Purification of VviDREBA1 Proteins

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The full VviDREBA1s [GenBank Accession No. MF445007 (VviDREBA1-1), MF445008 (VviDREBA1-6) and MF445009 (VviDREBA1-7)] open reading frames (ORFs), including stop codons, were amplified by RT-PCR using the primers included in the Supplementary Table S1. The forward VviDREBA1-7 and VviDREBA1-1 primers contained a BamHI site, and the forward VviDREBA1-6 primer contained a XhoI site. The three reverse primers contained an EcoRI site. The resulting fragments digested with their respective restriction enzymes were cloned into the pTrcHisA vector, which contains an N-terminal His6 (Invitrogen, Carlsbad, CA, United States), previously digested with the same enzymes, and transformed into BL21-CodonPlus (DE3)-RIL competent cells. The induction and purification of recombinant proteins were performed according to Romero et al. (2008) (link). The purified fusion proteins were concentrated as described by Romero et al. (2016) (link). Protein analyses were performed on 12.5% sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS–PAGE) using Mini-Protean II Cell (Bio-Rad) equipment as described by Rosales et al. (2014) (link). Western blots were probed with antibodies and conditions previously described by Romero et al. (2016) (link).
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7

Mammalian Expression Plasmids and Constructs

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The pCI-neo-SNX27-Myc plasmid and the pCI-neo control plasmids were described previously (Rincon et al., 2007 (link); Wang et al., 2013b ). The pIPuro vector was generated from pCDNA3 with an IRES-Puromycin resistance marker cloned into the 3' XbaI site. FLAG was inserted into HindIII/BamHI sites using 5'- agcttaccatggactacaaagacgatgacgataaaggaggcg and 5'-GATCCGCCTCCTTTATCGTCA TCGTCTTTGTAGTCCATGGTA oligos, where the full-length SNX27 and SNX27ΔPDZ DNA fragments were cloned in-frame using BamHI and NotI cloning sites. His6-SNX27 construct was generated by inserting full-length human SNX27 into a pTrcHis A vector (Invitrogen). The DNA fragments encoding the PS1 NTF, PS1 CTF, PS1 CTF lacking last 4 amino acids, SNX27 and SNX27ΔPDZ were inserted into the pRK5mGST vector (Huang et al., 2013 (link)) to generate GST-tagged constructs. Notch NΔE plasmid was previously reported (Schroeter et al., 1998 (link)).
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8

Purification of C2AB and SNARE Complexes

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Constructs encoding Syt1 C2AB (a.a. 96–421) and Doc2β C2AB (a.a. 125–407) were expressed as GST fusion proteins (pGEX-4T vector, GE) in E. Coli, purified via glutathione-Sepharose affinity chromatography, and cleaved with thrombin in 100 mM KCl, 25 mM HEPES pH 7.4, 5% glycerol. Halo-C2AB constructs were assembled by overlap extension PCR and subcloned into pTrcHis A vector (ThermoFisher) to yield N-terminal His6-HaloTag-C2AB constructs. These constructs were expressed in E. Coli, purified via Nickel-NTA chromatography, and eluted in His-tag elution buffer (500 mM imidazole, 400 mM KCl, 25 mM HEPES pH 7.4, and 10% glycerol). The SNAP-25B-syntaxin1a heterodimer was subcloned into the pRSF Duet vector (Novagen) with the His6-tag on the N-terminus of SNAP-25, expressed in E. Coli, purified via nickel-NTA chromatography, and eluted in His-tag elution buffer containing 1% octylglucoside and 2 mM DTT.
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9

Purification of Synaptotagmin Constructs

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Constructs encoding syt-1 C2AB (a.a. 96–421) and syt-17 C2AB (a.a. 152–474) were expressed as GST fusion proteins (pGEX-4T vector, GE) in E. coli, purified via glutathione-Sepharose affinity chromatography, and cleaved with thrombin in 100 mM KCl, 25 mM HEPES pH 7.4, 5% glycerol. HaloTag constructs were assembled by overlap extension PCR and subcloned into pTrcHis A vector (ThermoFisher) to yield N-terminal His6-HaloTag-syt constructs. These constructs were expressed in E. coli, purified via nickel-NTA chromatography, and eluted in Hisg-tag elution buffer (500 mM imidazole, 400 mM KCl, 25 mM HEPES pH 7.4, and 10% glycerol). Full-length syt-17 was purified by affinity chromatography of E. coli lysates using HaloLink resin (Promega) and eluted by cleavage with TEV protease in 100 mM KCl, 25 mM HEPES pH 7.4, 5% glycerol, 1% Triton X-100 with 2 mM DTT.
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