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5 protocols using clone 16b12

1

GPCR Immunoprecipitation and Western Blot

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For immunoprecipitation experiments, WTT-CHO cells were transiently transfected with pcDNA3.1 (+) empty vector (control) or vectors encoding HA-GPCRs in similar conditions to those used for AFM-SMFS experiments. Forty-eight hours post-transfection, cells were lysed in a lysis buffer (140 mM NaCl/2 mM EDTA/25 mM Tris, pH 7.4/0.5% DDM) supplemented with complete protease and phosphatase inhibitors (Roche). Protein extracts (~2 mg) were immunoprecipitated overnight at 4 °C with DynabeadsTM Protein G (Invitrogen) precoated with an anti-HA antibody (BioLegend, 16B12 Clone) and proceeded to western-blot analysis as previously described33 (link). Proteins were detected with the anti-HA primary antibodies (Biolegend, 16B12 Clone) followed by antimouse Horse Radish Peroxidase (HRP)-conjugated secondary antibodies (TrueBlot, eB144Clone, Rockland) using enhanced chemiluminescence detection reagent (RPN2232 Prime, GE Healthcare).
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2

Western Blotting of HA- and FLAG-tagged Proteins

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We performed western blotting as in Polino et al. (2020) (link) with primary antibodies mouse anti-HA diluted 1:1000 (clone 16B12; Biolegend, 901501), rabbit anti-HA diluted 1:1000 (Sigma-Aldrich, H6908), rabbit anti-PfAldolase diluted 1:2000 (Abcam, ab207494; targets the protein with PlasmoDB accession PF3D7_1444800) and mouse anti-FLAG diluted 1:500 (Sigma-Aldrich, F1804), followed by secondary antibodies goat anti-mouse IRDye 800CW (Licor) and donkey anti-rabbit IRDye 680RD (Licor), both diluted 1:10,000. For Fig. 2C, parasites were harvested at the indicated times and Pf3D7_1437000-3xHA levels were quantified using ImageStudio Lite v. 5.2 (Licor). The sizes of bands were approximated using the Precision Plus Protein Dual Color Standards (Bio-Rad, 1610374).
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3

HA-Tagged Protein Immunoprecipitation

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Immunoprecipitation using mouse monoclonal anti-HA antibody (1:50; clone 16B12, BioLegend) were performed as previously reported with minor modification (37 (link)).
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4

Immunohistochemical Analysis of 5-HT1A Receptors

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The primary antibodies utilized were: rat anti-serotonin antibody (1:100 dilution, clone YC5/45, Merck), rabbit anti-ankyrin-G (anti-ankG; 1:300 dilution, H-215, Santa Cruz Biotechnology), mouse anti-microtubule-associated protein-2 (anti-MAP-2; 1:250 dilution, A-4, Santa Cruz Biotechnology), goat anti-choline acetyltransferase (anti-ChAT; 1:100 dilution. AB144P, Merck Life Science A/S), rabbit anti-5-HT1A (1:100, H-119, Santa Cruz Biotechnology), rabbit anti-5-HT1A (1:50, ASR-021, Alomone Labs), rabbit anti-5-HT1A (1:100, ADI905-741-100, Enzo Life Sciences), rabbit 5-HT1A (1:100, NB100-92418, Novus Biologicals), and mouse anti-HA epitope (1:500 dilution, clone 16B12, Biolegend). Rabbit 5HT1A S1A-170 serum (1:1000–1:2500 dilutions) was a generous gift from Professor Efrain C. Azmitia, New York University, New York, NY, USA.
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5

Radioactive Labeling of Inositol Phosphates in HEK293A Cells

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HEK293A cells were plated at a density of ~75000 cells/well in 12-well tissue culture dishes in growth medium [DMEM containing 10% (v/v) FBS, 100 units/mL penicillin, 100 μg/mL streptomycin, and 0.25 μg/mL amphotericin B]. Twenty-four hours later, cells were transiently transfected with 100 ng of a plasmid encoding HA-tagged wild-type PLC-γ1 or PLC-γ1 (D1165H) using Continuum transfection reagent according to the manufacturer’s protocol (GeminiBio). Twenty-four hours post-transfection, growth medium was removed and cells were metabolically labeled overnight with 1 μCi of [3H]-myo-inositol in serum-free, inositol-free DMEM. Radiolabeling medium was then removed and replaced with vehicle [serum-free, inositol-free DMEM containing 1 μCi of [3H]-myo-inositol and 1% (v/v) DMSO] or a vehicle containing 30 μM Hit-1, and cells were incubated for 1 h. Cells were then treated with 10 mM LiCl (final concentration) for an additional 1 h, and accumulation of [3H]inositol phosphates was quantified by Dowex column chromatography as described previously. Expression of each version of PLC-γ1 was confirmed by immunoblotting of cell lysates using a monoclonal antibody against the HA epitope (BioLegend, clone 16B12; RRID: AB_2565335). A monoclonal antibody against β-actin (SigmaAldrich, clone AC-15; RRID: AB_476692) was used as a loading control.
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