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4 protocols using mouse anti ha antibody

1

SDS-PAGE and Western Blot of Recombinant Proteins

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Purified recombinant proteins were mixed with 5 × SDS reducing loading buffer and boiled for 8 min at 100 °C and then resolved on 10% to 12% SDS-PAGE followed by Coomassie brilliant blue staining. For Western blot analysis, purified recombinant proteins, protein pulldowns, and eluted proteins were separated by 10% to 12% SDS-PAGE and transferred onto polyvinylidene difluoride membranes (Millipore) and block with 5% skimmed milk in Tris-buffered saline-Tween 20 for 2 h at room temperature (RT). After washing with Tris-buffered saline-Tween 20 three times, the polyvinylidene difluoride membranes were incubated with primary antibodies overnight at 4 °C and then with a horseradish peroxidase-labeled goat anti-mouse or anti-rabbit IgG antibody (SouthernBiotech) for 1.5 h at RT. The fluorescence signals were visualized using an enhanced chemiluminescence kit (New cell & Molecular Biotech) and analyzed using a ChemiDoc MP imaging system (Bio-Rad). The following primary antibodies were used: mouse anti-His antibody (ABclonal), mouse anti-HA antibody (ABclonal), rabbit anti-GST antibody (Proteintech), rabbit anti-Flag antibody (Proteintech), mouse anti-PfGAMA-Tr3 antisera, rabbit anti-ANK1-F2 antisera, and rabbit anti-band 3-P5 antisera.
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2

Immunodetection of HA and FLAG Proteins

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Mouse anti-HA antibody and anti-FLAG antibody were purchased from Abclonal Technology. Horseradish peroxidase-conjugated goat anti-mouse antibody was purchased from Bioss.
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3

RIP Assay for Protein-RNA Interactions

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RIP assays were conducted using the Magna RIP RNA-Binding Protein Immunoprecipitation Kit (Millipore, Billerica, USA). Briefly, MGC-803 cells were lysed in RNA lysis buffer with protease and RNase inhibitors. The cell lysates were incubated with magnetic beads conjugated with 5 μg negative control lgG (Cat# CS200621, Cat# PP64B, Millipore, Billerica, USA), positive control anti-snRNP70 antibody (Cat# CS203216, Millipore, Billerica, USA), mouse anti-AGO2 antibody (Cat# 03-110, RRID: AB_10615426, Millipore, Billerica, USA), rabbit anti-HuR antibody (Cat# 03-102, RRID: AB_11211202, Millipore, Billerica, USA) or Mouse anti-HA antibody (Cat# AE008, RRID: AB_2770404, ABclonal, USA) and rotated at 4 °C overnight. The beads were then washed and digested with proteinase K buffer at 55 °C for 30 min to remove proteins. The immunoprecipitated RNA was extracted and purified for RT-qPCR analysis.
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4

Co-immunoprecipitation of RNS1 and Fus3

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The master plasmid pPK2-sur-Ptef-FLAG or pPK2-bar-Ptef-HA was used for producing a protein fused with FLAG or HA, respectively (26 (link)). To assay the in vivo interaction between RNS1 and Fus3, an RNS1-FLAG/Fus3-HA strain expressing the fusion protein RNS1::FLAG and Fus3::HA was constructed. The coding sequence of RNS1 was inserted into pPK2-sur-Ptef-FLAG, and the resulting plasmid was then transformed into the WT strain to produce the WT-RNS1-FLAG strain. The coding sequencing of Fus3 was inserted into the plasmid pPK2-bar-Ptef-HA to produce pPK2-sur-Ptef-Fus3-HA, which was transformed into the WT-RNS1-FLAG strain to produce the RNS1-FLAG/Fus3-HA strain.
Extraction of total fungal proteins and Co-IP analysis were performed as described previously (26 (link)). Protein concentration was determined using the bicinchoninic acid (BCA) protein assay kit (Meilune, Dalian, China). The mouse anti-HA antibody was purchased from Abclonal (Hangzhou, China), and the rabbit anti-FLAG antibody was purchased from Sigma-Aldrich (MO, USA). Dynabeads protein G beads were purchased from Invitrogen (CA, USA). Detection of a target protein was conducted using Western blot analysis. All blots were imaged by a chemiluminescence detection system (Clarity Western ECL; Bio-Rad). All Co-IP assays were repeated three times.
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