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Histidine Tag, Goat anti_; ELISA,WB

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[#YSRTAHP1656] Histidine Tag, Goat anti_; ELISA,WB

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YSRTAHP1656 | Histidine Tag, Goat anti_; ELISA,WB, 0.1 mg.
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(1) Generation and characterization of a potentially applicable Vero cell line constitutively expressing the Schmallenberg virus nucleocapsid protein.[TOP]

Pubmed ID :28083834
Publication Date : //
Schmallenberg virus (SBV) is a Culicoides-transmitted orthobunyavirus that poses a threat to susceptible livestock species such as cattle, sheep and goats. The nucleocapsid (N) protein of SBV is an ideal diagnostic antigen for the detection of viral infection. In this study, a stable Vero cell line, Vero-EGFP-SBV-N, constitutively expressing the SBV-N protein was established using a lentivirus system combined with puromycin selection. This cell line spontaneously emitted green fluorescent signals distributed throughout the cytoplasm, in which the expression of SBV-N fusion protein was confirmed by western blot analysis. The expression of SBV-N protein in Vero-EGFP-SBV-N cells was stable for more than fifty passages without puromycin pressure. The SBV-N fusion protein contained both an N-terminal enhanced green fluorescent protein (EGFP) tag and a C-terminal hexa-histidine (6 × His) tag, by which the N protein was successfully purified using Ni-NTA affinity chromatography. The cell line was further demonstrated to be reactive with SBV antisera and an anti-SBV monoclonal antibody in indirect immunofluorescence assays. Taken together, our results demonstrate that the Vero-EGFP-SBV-N cell line has potential for application in the serological diagnosis of SBV infection.

Authors : Zhang Yongning, Wu Shaoqiang, Song Shanshan, Lv Jizhou, Feng Chunyan, Lin Xiangmei,



(2) Preparation and characterization of a stable BHK-21 cell line constitutively expressing the Schmallenberg virus nucleocapsid protein.[TOP]

Pubmed ID :26013296
Publication Date : //
Schmallenberg virus (SBV) is a newly emerged orthobunyavirus that predominantly infects livestock such as cattle, sheep, and goats. Its nucleocapsid (N) protein is an ideal target antigen for SBV diagnosis. In this study, a stable BHK-21 cell line, BHK-21-EGFP-SBV-N, constitutively expressing the SBV N protein was obtained using a lentivector-mediated gene transfer system combined with puromycin selection. To facilitate the purification of recombinant SBV N protein, the coding sequence for a hexa-histidine tag was introduced into the C-terminus of the SBV N gene during construction of the recombinant lentivirus vector pLV-EGFP-SBV-N. The BHK-21-EGFP-SBV-N cell line was demonstrated to spontaneously emit strong enhanced green fluorescent protein (EGFP) signals that exhibited a discrete punctate distribution throughout the cytoplasm. SBV N mRNA and protein expression in this cell line were detected by real-time RT-PCR and western blot, respectively. The expressed recombinant SBV N protein carried an N-terminal EGFP tag, and was successfully purified using Ni-NTA agarose by means of its C-terminal His tag. The purified SBV N protein could be recognized by SBV antisera and an anti-SBV monoclonal antibody (mAb) 2C8 in an indirect enzyme-linked immunosorbent assay and western blot analyses. Indirect immunofluorescence assays further demonstrated that the stable cell line reacts with SBV antisera and mAb 2C8. These results suggest that the generated cell line has the potential to be used in the serological diagnosis of SBV.

Authors : Zhang Yongning, Wu Shaoqiang, Song Shanshan, Lv Jizhou, Feng Chunyan, Lin Xiangmei,



(3) Detection of grass carp reovirus (GCRV) with monoclonal antibodies.[TOP]

Pubmed ID :24122108
Publication Date : //
Grass carp reovirus (GCRV) is a pathogen that causes hemorrhagic disease of grass carp. It is the most serious infectious disease of carp and causes serious losses of fingerlings of grass carp and black carp. In this study, a recombinant VP4, one of the viral core proteins, was constructed with a histidine tag and expressed at a high level in E. coli, and the expressed protein was mainly found in the form of inclusion bodies. The expressed VP4 protein was recognized by an anti-His-tag monoclonal antibody and goat anti-GCRV serum. Four monoclonal antibodies (16B7, 39E12, 13C3 and 14D1) against the recombinant VP4 protein were produced. These MAbs did not react with any of the tested viruses or fish cells lines in the ELISA tests except GCRV. In western blotting analysis, a protein band was observed when the recombinant VP4 protein of GCRV was used as an antigen, but a 68-kDa band was observed when natural capsid proteins of GCRV were used as antigens. Furthermore, a sandwich ELISA was developed for detection of GCRV. The detection limit of the test was 105 TCID50 of GCRV per mL.

Authors : Hongli Jing, Lifeng Zhang, Zhenzhen Fang, Lipu Xu, Min Zhang, Na Wang, Yulin Jiang, Xiangmei Lin,



(4) Cloning and expression of antibacterial goat lactoferricin from Escherichia coli AD494(DE3)pLysS expression system.[TOP]

Pubmed ID :19244908
Publication Date : //
Goat lactoferricin (GLfcin), an antibacterial peptide, is released from the N terminus of goat lactoferrin by pepsin digestion. Two GLfcin-related cDNAs, GLfcin L and GLfcin S, encoding Ala20-Ser60 and Ser36-Ser60 of goat lactoferrin, respectively, were cloned into the pET-23a(+) expression vector upstream from (His)6-Tag gene and transformed into Escherichia coli AD494(DE3)pLysS expression host. After being induced by isopropyl-beta-D-thiogalactopyranoside (IPTG), two (His)6-Tag fused recombinant lactoferricins, GLfcin L-His*Tag and GLfcin S-His*Tag, were expressed in soluble form within the E. coli cytoplasm. The GLfcin L-His*Tag and GLfcin S-His*Tag were purified using HisTrap affinity chromatography. According to an antibacterial activity assay using the agar diffusion method, GLfcin L-His*Tag had antibacterial activity against E. coli BCRC 11549, Staphylococcus aureus BCRC 25923, and Propionibacterium acnes BCRC 10723, while GLfcin S-His*Tag was able to inhibit the growth of E. coli BCRC 11549 and P. acnes BCRC 10723. These two recombinant lactoferricins behaved as thermostable peptides, which could retain their activity for up to 30 min of exposure at 100 degrees C.

Authors : Chen Gen-Hung, Yin Li-Jung, Chiang I-Hua, Jiang Shann-Tzong,