his tag  (Proteintech)

Journal: Biotechnology Reports

Article Title: Comparative analysis of anti-MICA scFv affinities: Insights from three label-free biophysical methods and biological validation

doi: 10.1016/j.btre.2026.e00955

Figure Lengend Snippet: Characterization of Recombinant Proteins: MICA and anti-MICA scFvs. (A) Molecular model, shown as a ribbon representation, of the variable fragment of the anti-MICA scFvs. The framework is displayed in white, the light chain CDRs are shown in cyan, and the heavy chain CDRs are shown in yellow. The residues with mutations are shown as magenta spheres [residues 32 (CDR L1), 164 (CDR H1), and 188/190 (CDR H2)]. (B) Schematic diagram of the scFv gene. The modified pET-15b vector was used for the expression of the WT and Beta mutant scFvs, each carrying four mutations: I32Y in CDR1 of the VL, and S164F, P188W, and G190W in CDR1, CDR2, and CDR2 of the VH, respectively. Recombinant proteins were expressed in E. coli BL21(DE3). (C) SDS-PAGE analysis showing the purity of recombinant proteins: WT scFv, Beta mutant scFv, and MICA. Proteins were resolved on a 12% acrylamide gel under reducing conditions. SDS-PAGE results show the soluble fraction (SF), unbound protein (UBP), elution of purified scFv (E), renatured proteins (R) and inclusion bodies (IB). MW, molecular weight. (D-E) Western blot analysis confirming the identity of scFvs and MICA using an anti-HisTag antibody. For the identification of the WT and Beta mutant scFvs, Anti-6xHis Epitope Tag mouse monoclonal antibody conjugated with peroxidase (200-303-382) was used at a dilution of 1:1000. For the identification of MICA, a biotinylated Anti-MICA antibody (BAMO3 (BAFI300, BamOmaB)) and Streptavidin were used at a dilution of 1:2000. A total of 2 μg of purified protein was loaded. The negative control (Ctrl -) for MICA detection was WT scFv and MICA protein was used for scFv detection. Original gel is presented in Fig. S1, Supplementary information.

Article Snippet: The identity of MICA and scFvs proteins was confirmed by western blot using a HRP-conjugated anti-His tag monoclonal antibody (200-303-382, Rockland, USA).

Techniques: Recombinant, Modification, Plasmid Preparation, Expressing, Mutagenesis, SDS Page, Acrylamide Gel Assay, Purification, Molecular Weight, Western Blot, Negative Control

Journal: Transboundary and Emerging Diseases

Article Title: Toxoplasma gondii KCR is a Noncanonical Modulator of CSF2 Signaling that Targets the CSF2Rα–JAK2/STAT5 Axis

doi: 10.1155/tbed/8426765

Figure Lengend Snippet: Protein interactions and eukaryotic protein acquisition. (A) Schematic overview of the screening strategy and identification of T. gondii KCR. (B) Co‐immunoprecipitation identification of the interaction between KCR and murine CSF2Rα input: cell lysates from HEK 293T cells co‐transfected with pcDNA3.1‐KCR and pCAGGS‐CSF2R for 24 h; IP: KCR, CSF2α or IgG: immunoprecipitation was performed using Flag‐tag mouse mAb, His‐tag mouse mAb or mouse IgG; IB: KCR or CSF2α: immunoblot analysis was performed using Flag‐tag rabbit mAb or His‐tag rabbit pAb. (C) Acquisition of KCR eukaryotic protein. Lane M: standard molecular marker for protein; lane 1: cell lysates from HEK 293T cells transfected with pcDNA3.1‐KCR for 24 h; lane 2: purified KCR eukaryotic protein. (D) Western blot analysis of KCR M: standard molecular marker for protein; lane 3: his‐tag in purified KCR was identified by His‐tag mouse mAb.

Article Snippet: Flag‐tag mouse monoclonal antibody (mAb) (#M20008), His‐tag mouse mAb (# M20001 ), and mouse IgG (#B30010M) were purchased from Abmart Biotech, Inc. (Shanghai, China).

Techniques: Immunoprecipitation, Transfection, FLAG-tag, Western Blot, Marker, Purification

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: JGF inhibits NO, IL-6, and TNF-α production in RAW264.7 and MH-S cells. The cells were treated with JGF (50, 100, 150, 300, 600 μg/mL), 2-E (0.1 μM), DXT (10 μM), or LPS (0.1 μg/mL) for 24 h. ( A ) Cell viability was evaluated using crystal violet. ( B ) NO production was measured using the Griess assay. ( C-D ) IL-6 ( C ) and TNF-α ( D ) levels were determined by ELISA. EC 50 was calculated by CompuSyn software. Data was presented as mean ± standard deviation (SD) for groups (n = 3). Significant differences are denoted as ∗ p < 0.05, ∗∗ p < 0.01, ∗∗∗ p < 0.001.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: Griess Assay, Enzyme-linked Immunosorbent Assay, Software, Standard Deviation

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: Components of JGF inhibit 2-E-induced inflammation. The RAW264.7 and MH-S cells were co-treated with JGF compounds and 2-E for 24 h. ( A ) The 3D-HPLC fingerprint of JGF. Compound structures were sourced from the PubChem database. The detection wavelength ranged from 200 to 400 nm, and the injection volume was 20 μL. ( B ) Cell viability was evaluated using crystal violet. ( C ) NO production was measured using the Griess assay. ( D-E ) IL-6 ( D ) and TNF-α ( E ) levels were determined by ELISA. Data are presented as mean ± SD (n = 3). Statistical significance was determined relative to the 2-E group. Significant differences are denoted as ∗ p < 0.05, ∗∗ p < 0.01, ∗∗∗ p < 0.001.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: Injection, Griess Assay, Enzyme-linked Immunosorbent Assay

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: JGF downregulates 2-E-induced iNOS and COX-2 in RAW264.7 and MH-S cells. Cells were treated with JGF (0, 50, 200 μg/mL) or 2-E (0.1 μM) for 24 h. ( A ) Protein levels of iNOS and COX-2 in macrophages were measured by Western blot. ( B-C ) Quantification of iNOS and COX-2 in cells without ( B ) and with ( C ) 2-E stimulation, calculated using ImageJ. Actin was used as the internal control. The non-detected data showed as – or ND. Data are presented as mean ± SD (n = 3). Significant differences are denoted as ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: Western Blot, Control

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: JGF inhibits 2-E-induced phosphorylation of STAT3 in RAW264.7 and MH-S cells. Cells were treated with JGF (0, 50, 200 μg/mL) or 2-E (0.1 μM) for 3 h. ( A ) Protein levels of phosphorylated JAK2 and STAT3 were measured by Western blot. ( B-C ) Quantification of phosphorylated JAK2 and STAT3 in cells without ( B ) and with ( C ) 2-E stimulation, calculated using ImageJ. Actin was used as the internal control. Data are presented as mean ± SD (n = 3). Significant differences are denoted as ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: Phospho-proteomics, Western Blot, Control

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: JGF inhibits 2-E-induced phosphorylation of ERK1/2 in RAW264.7 and MH-S cells. Cells were treated with JGF (0, 50, 200 μg/mL) or 2-E (0.1 μM) for 3 h. ( A ) Protein levels of phosphorylated JNK1/2, ERK1/2, p38, and p65 were measured by Western blot. ( B-C ) Quantification of phosphorylated JNK1/2, ERK1/2, p38, and p65 in cells without ( B ) and with ( C ) 2-E stimulation, calculated using ImageJ. Actin was used as the internal control. Data are presented as mean ± SD (n = 3). Significant differences are denoted as ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: Phospho-proteomics, Western Blot, Control

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: JGF reduces the 2-E-induced proinflammatory cytokines in vivo . ( A ) The experimental scheme for mouse exposure. ( B-F ) Levels of IL-6 ( B ), TNF-α ( C ), IFN-γ ( D ), IL-1β ( E ), and IL-12 ( F ) in lung tissue and serum were measured by ELISA. Data are presented as mean ± SD (n = 9 for serum, except DXT group n = 6; n = 6 for lung tissue, except DXT group n = 3) ( G ) Representative histological images of lung tissue stained with H&E and IHC images for IL-6, TNF-α, and IL-1β expression. ( H-J ) Quantification of IL-6 ( H ), TNF-α ( I ), and IL-1β ( J ) positive areas using ImageJ (n = 3). Significant differences between the control (CTL) group and other groups are denoted by ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001. Significant differences between the 2-E group and 2-E + JGF group are indicated by #p < 0.05, ##p < 0.01, ###p < 0.001.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: In Vivo, Enzyme-linked Immunosorbent Assay, Staining, Expressing, Control

Journal: Journal of Traditional and Complementary Medicine

Article Title: Chemical characterization of Jing Guan Fang and its application in alleviating coronavirus envelope protein-induced proinflammatory responses in vitro and in vivo

doi: 10.1016/j.jtcme.2025.12.003

Figure Lengend Snippet: Schematics showing the anti-inflammatory mechanism of JGF in 2-E-induced mice macrophages.

Article Snippet: SARS-CoV-2-envelope (2-E) protein (Cat# NBP2–90986) was purchased from Novus Biologicals (Littleton, CO, USA).

Techniques: