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His tag

Manufactured by Roche

His-tag is a small peptide tag that can be added to recombinant proteins to facilitate their purification and detection. It consists of a series of 6-10 consecutive histidine residues that have a high affinity for metal ions, allowing the tagged protein to be easily captured on a metal-affinity resin.

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2 protocols using his tag

1

Western Blotting and qRT-PCR of Cadherin-23

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The adherent cancer cell lines HeLa, HEK293, A549, and HaCaT were obtained from NCCS, Pune. All cells were cultured in high glucose DMEM media (D1152, Sigma-Aldrich) containing 10% FBS and 5% CO2. We followed the standard protocol50 (link) for the western blotting of the lysates from the mentioned cell lines. Cadherin-23 (HPA017232, Sigma-Aldrich and PA5-43398, Invitrogen), eGFP (A11122, Invitrogen), and His-tag (11965085001, Roche) antibodies were used at the concentration of 1 μg/ml to detect the proteins.
RNA from different cancer cell lines was extracted using RNA isolation kit (Bio Rad) and treated with DNAse using DNAse 1 kit (AMPD1, Sigma-Aldrich). cDNA synthesis was done using a cDNA synthesis kit (Bio Rad). qRT-PCR was performed with the primers probing Cdh23 using the real-time PCR system (CFX96 Bio Rad).
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2

Production and Purification of Recombinant Antibodies

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For the production of diabodies, anti-PD-1 scFv, anti-c-Met scFv, anti-PD-1 mAb, anti-c-Met mAb, and anti-PD-1/c-Met scFv-Fc, a suspension of growing HEK293E cells at a final concentration of 106 cells/mL were transfected with plasmids by PEI (Polysciences, Shanghai, China). Tryptone N1 was added to the culture at a final concentration of 0.5%. After 7 days of culture in conical flasks gently shaken on the platform of an orbital incubator rotating at 125 rpm, 37°C, and 8% CO2, the supernatants were harvested and purified using His-tag (Roche, Mannheim, Germany) or Protein A Purification column (GenScript, Nanjing, China) by AKTA Explorer. Eluted fractions were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis.
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