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6 protocols using ac5 stable2 neo

1

Generating Rh1 Transmembrane Variant Transgenic Lines

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The following DNA fragments were obtained by PCR. For Rh1-V5-T2A-GFP, GH24720 clone (DGRC) ligated strep-tag and V5-tag (WSHPQFEKGGRGKPIPNPLLG) at 3′ was replaced with the sequence encoding mCherry of Ac5-STABLE2-neo (Addgene; plasmid #32426) to obtain Ac-Rh1-V5-T2A-GFP. This plasmid was digested by SpeI and XhoI and inserted between the SpeI and XhoI sites of pUAST (Drosophila Genomics Resource Center, Bloomington, IN) to construct pP{UAST-Rh1-V5-T2A-GFP}.
For Rh1 TM variants, DNA fragments encoding Rh1 fragment (Met1-I74, Met1-L146, or Met1-V241) and Rh1 C-tail-V5 fusion (H333-A373-WSHPQFEKGGRGKPIPNPLLG*) with homologous nucleotide sequences were obtained from the pP{UAST-Rh1-V5-T2A-GFP} by PCR using the following primers: CTCTGAATAGGGAATTGGG­AATTCGCCACCATGGAGAGCTTTG and CAGGCGATATTTCGGATGTATGTAGATCACCACGCCATTTCCG, CTCTGAATAGGGA­ATTGGGAATTCGCCACCATGGAGAGCTTTG and CAGGCGA­-TATTTCGGATGCAGGGAGATCATGCACATGGAC, CTCTGAA­T-­AGGGAATTGGGAATTCGCCACCATGGAGAGCTTTG and CAGGCGATATTTCGGATGGACAGCAGCAATGATGAACCAGTAAG, and CATCCGAAATATCGCCTGGCCC and AAGATCCTCTAGAGGTACCCTTACGTAGAATCGAGACCGAGGAGAGG, respectively. These fragments were inserted between the EcoRI and XhoI sites of pUAST by Gibson assembly to obtain pP{UAST-Rh1-TMx-V5} (x = 1, 123, or 12345). These plasmids were injected into embryos by BestGene (Chino Hills, CA) to generate transgenic lines.
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2

Comprehensive Plasmid Database for Genetic Manipulation

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For a list of plasmids, we generated for this study, see Additional file 3: Table S2. The original plasmids we used for this project were obtained from Addgene: pCFD3 (#49410), pCFD5 (#73914), pACG:eCFP (#32597), pDsRed-attP (#51019), Ac5-Stable2-Neo (#32426), pC0056-LwaCas13a-msfGFP-NES (#105815), pC0040-LwaCas13a crRNA backbone (#103851), pC0046-EF1a-PspCas13b-NES-HIV (#103862), pC0043-PspCas13b crRNA backbone (#103854), pC0054-CMV-dPspCas13b-longlinker-ADAR2DD (E488Q/T375G) (103870), pXR001: EF1-CasRX-2A-eGFP (#109049), pXR004: CasRX pre-gRNA cloning backbone (#109054), pBID-UASc (#35200), [10 (link), 12 (link), 23 (link), 35 (link), 46 (link), 50 (link), 107 (link)–110 (link)]. We also obtained plasmids from the Drosophila Genetic Resource Center (DGRC): pAFW (#1111), pAHW (#1095), act-PhiC31-integrase (#1368). We also used plasmids we previously generated, enDmC, to generate some constructs for this study [8 (link)]. pMT-Gal4-puro plasmid was a kind gift from Christoph Metzendorf (University of Uppsala). All fragments used for the cloning step were amplified via PCR using Q5 high-fidelity DNA polymerase (NEB #M0491S) (Additional file 4: Table S3) and fused together via Gibson assembly reaction [111 (link)].
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3

Fluorescent Protein Expression Cloning

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EB1 (DGRC, RE41364) and mScarlet [D. Gadella (62 (link)); Addgene, 85042] were amplified with PCR and cloned into Ac5-Stable2-neo [R. Barrio and J. Sutherland (63 (link)); Addgene, 32426] with inserts removed by PCR.
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4

S2 Cell Culture and Imaging

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S2 cells were maintained in Schneider’s medium (ThermoFisher, 21720-001) supplemented with 10% (v/v) fetal bovine serum (ThermoFisher, 16140071) and 1% (v/v) penicillin streptomycin (ThermoFisher, 15140122). Constructs expressed in S2 cells were driven by the act5c promoter by subcloning into Ac5-Stable2-neo (Addgene #32426). Transfections were carried out using Effectene (Qiagen, 301425) following manufacturers recommendations. Transfected S2 cells were plated onto Labtek slides (ThermoFisher, 155409) coated with a 50 μg/ml solution of Concanavalin A diluted in PBS (Cayman Chemical, 14951) for 1 h at room temperature. S2 cells were subsequently imaged on a widefield Nikon Eclipse Ti using a Plan-Apochromat 60 × /1.4 NA oil objective.
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5

Stable Expression of CAHS3 in Drosophila S2 Cells

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The expression vector Ac5-STABLE2-neo was obtained from Addgene (#32426) [62 (link)], and then the coding
sequence of FLAG-mCherry was replaced with the codon-optimized CAHS3 coding
sequence (Gene Universal) to express CAHS3-T2A-EGFP-T2A-neoR under the control
of Ac5 promoter. The empty vector was constructed by deleting FLAG-mCherry from
Ac5-STABLE2-neo, which was designed to express T2A-EGFP-T2A-neoR driven by the
same Ac5 promoter. Drosophila S2 cells were transfected using a
cationic liposome reagent Hilymax (Dojindo) with the expression construct or the
empty vector above. We established stably transfected cells by culturing for 6
weeks under the drug selection with G418 disulfate (2,000 μg/mL, Nacalai
Tesque).
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6

Cloning and Expression of Vsg Fusion Proteins

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avsg (Protein ID: XP_021708011.1), rvsg (XP_972460.1), svsg (KAF9794377.1), vsg (NP_729535.1), agvsg (XP_001688320.1), gvsg (XP_026748881.1), TMEM123 (NP_443164.2), and CD164 (NP_006007.2) were synthesized by Twist Bio. Their entire coding sequences, excluding the final 15 bp, were cloned into pEGFP-N1 vector between the sites NheI and BamHI to build the Vsg-GFP fusion constructs for mammalian cells transient expression. For all the pCMV-SP-GFP-Vsgs, GFP was inserted immediately following the signal peptide of Vsgs and amplified SP-GFP-Vsgs were inserted into the pEGFP-N1 vector between the sites NheI and XbaI. The entire coding sequences of avsg, rvsg, svsg, vsg, TMEM123 and CD164 were subcloned into the sites BamHI and XbaI in vector pLenti CMV/TO Hygro empty (w214–1) (17484, Addgene) for establishing stable cell lines. For S2 cell-based rescue experiments, entire coding sequences of avsg and vsg were subcloned into the sites EcoRI and XhoI in vector Ac5-stable2-Neo (32426, Addgene). To build Vsg-ECD-Fc expression construct, two fragments vsg (67–444bp) or sVsg-ECD (52–546bp) and human Fc-his were amplified from vsgs and pHL-FcHis vector (99846, Addgene) respectively and cloned into the vector pMT-Bip-GFP:V5:KDEL (69917, Addgene) between the KpnI and PmelI sites through Gibson assembly (E2621, NEB).
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