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Ni nta

Manufactured by Sangon
Sourced in China

Ni-NTA (Nickel-Nitrilotriacetic Acid) is a type of affinity chromatography resin used for the purification of recombinant proteins containing a polyhistidine (His-tag) sequence. It utilizes the strong interaction between the nickel (Ni2+) ions and the histidine residues on the target protein to selectively bind and capture the protein of interest.

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4 protocols using ni nta

1

Cloning and Expression of SUMO Protein

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E. coli competent cells DH5α and BL21 (DE3) were purchased from TransGen Biotech (Beijing, China). Expression vector pET28a-SUMO was purchased from Miaoling Biotech (Wuhan, China). Cloning vector pMD18-T vector was purchased from TaKaRa (Dalian, China). The restriction enzymes BamH Ⅰ and Hind Ⅲ, T4 DNA ligase and the high-fidelity thermostable DNA polymerase were from TaKaRa.
Primers were synthesized by Shanghai Sangon (China). Immobilized metal ion affinity chromatography Ni-NTA (Pre-Packed Gravity Column) was from Shanghai Sangon (China).
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2

PGRP-LB Protein Purification Protocol

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BL21 colonies were incubated in fresh LB medium at 37 °C with shaking at 200 rpm until OD 600 = 0.6. Then 0.5 mM isopropyl-β-dithiogalactoside was added to induce PGRP-LB expression with poly-His tags at the C-terminus. After incubation at 200 rpm for 4 h, the cells were collected and resuspended in Buffer B (8 M urea, 50 mM Tris-HCl, and 300 mM NaCl; pH 8.0). After sonication on ice for 10 min (5 s on, 10 s off), the supernatant was collected by centrifugation at 12,000×g and 4 °C for 10 min, mixed with nickel nitrilotriacetate (Ni-NTA; Sangon Biotech, Shanghai, China) and gently shaken at 4 °C overnight. The bound protein was eluted in PBS-T buffer with 20, 50, and 100 mM imidazole.
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3

Recombinant Expression and Purification of PfIL-17A/F Proteins

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The ORF sequence of Pf_IL-17A/F1, Pf_IL-17A/F2 and Pf_IL-17A/F3 genes after removal of the signal peptide sequence was amplified with gene-specific primers (Table 1) for prokaryotic expression. After digested with Sal I and EcoR I, the amplicon was inserted into the multiple cloning sites (MCS) of the pET-32a vector. The recombinant plasmid pET-32a-IL-17A/F1, pET-32a-IL-17A/F2 and pET-32a-IL-17A/F3 were then transformed into E. coli BL21 (DE3) competent cells, respectively, and the recombinant IL-17A/F (rIL-17A/F) expression was induced at 37°C for 4 h with IPTG at a final concentration of 1.0 mM. Subsequently, the rPf_IL-17A/F protein was purified by Ni-NTA (nitrilotriacetic acid) affinity chromatography (Sangon, Shanghai, China) according to the manufacturer’s instructions. The identity of the recombinant protein was confirmed by SDS-PAGE as a band with the correct molecular weight. The purified protein was quantitated using the Bradford protein quantitation assay by Nanodrop 2000 (Thermo Electron Corporation, USA).
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4

Purification and EMSA of CmAreA Transcription Factor

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The cDNA sequence of Cmarea was cloned into vector PET28a (provided by Prof. Linqi Wang from the Institute of Microbiology, Chinese Academy of Sciences) with a 6×His-tag and introduced into E. coli BL21-DE3 (Biomed Biotech Co., Ltd., Beijing, China). Expressed CmAreA was purified using nickel–nitrilotriacetic acid (Ni-NTA, Sangon Biotech Co., Ltd., Shanghai, China).
A 50 bp DNA probe containing the GATA sequences from the Cmhyd1 promoter was labeled with digoxigenin-11-ddUTP (DIG-11-ddUTP, Beyotime Biotech Co., Ltd., Beijing, China) at the 3′ end (Table S1). EMSA was performed with a Chemiluminescent EMSA Kit (Beyotime Biotech Co., Ltd., Beijing, China), following the manual.
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