Preparation and preliminary application of the polyclonal antibody against Toxoplasma gondii dense granule protein 24
10.16250/j.32.1374.2024083
- VernacularTitle:刚地弓形虫致密颗粒蛋白24多克隆抗体的 制备与初步应用
- Author:
Shengnan FU
1
;
Yun YANG
1
;
Cong WANG
1
;
Qingli LUO
1
;
Li YU
1
Author Information
1. Department of Microbiology, School of Basic Medical Sciences, Anhui Medical University, Anhui Provincial Key Laboratory of Zoonoses, The Provincial Key Laboratory of Zoonoses of High Institutions in Anhui Province, Hefei, Anhui 230032, China
- Publication Type:Journal Article
- Keywords:
Toxoplasma gondii;
Dense granule protein 24;
Polyclonal antibody;
Immunofluorescence assay
- From:
Chinese Journal of Schistosomiasis Control
2024;36(3):279-285
- CountryChina
- Language:Chinese
-
Abstract:
Objective To prepare and characterize the mouse polyclonal antibody against the dense granule protein 24 (GRA24) of Toxoplasma gondii, and explore its preliminary applications. Methods The GRA24 coding sequences of different T. gondii strains were aligned using the MEGA-X software, and the dominant peptide of the GRA24 protein was analyzed with the Protean software. The base sequence encoding this peptide was amplified using PCR assay and ligated into the pET-28a vector, and the generated GRA24 truncated protein was transformed into Escherichia coli BL21. After induction by isopropyl-beta-D-thiogalactopyranoside (IPTG), the expression and purification of the recombinant GRA24 protein was analyzed using sodium dodecyl sulfate - polyacrylamide gel electrophoresis (SDS-PAGE). BALB/c mice were immunized by subcutaneous injection with the purified recombinant GRA24 truncated protein to generate the polyclonal antibody, and the titer of the polyclonal antibody was measured using enzyme linked immunosorbent assay (ELISA). The specificity of the polyclonal antibody was tested using Western blotting, and the intracellular localization of the polyclonal antibody was investigated using immunofluorescence assay (IFA). Results SDS-PAGE showed successful construction of the recombinant expression plasmid, and Coomassie brilliant blue staining showed the generation of the high-purity recombinant GRA24 truncated protein. ELISA measured that the titer of the polyclonal antibody against the GRA24 truncated protein was higher than 1:208 400, and Western blotting showed that the polyclonal antibody was effective to recognize the endogenous GRA24 proteins of different T. gondii strains and specifically recognize the recombinant GRA24 truncated protein. Indirect IFA showed that the GRA24 protein secreted 16 hour following T. gondii invasion in host cells. Conclusions The polyclonal antibody against the T. gondii GRA24 protein has been successfully prepared, which has a widespread applicability, high titers and a high specificity. This polyclonal antibody is available for Western blotting and IFA, which provides the basis for investigating the function of the GRA24 protein.
