目的 构建分枝杆菌噬菌体D29 LysinB/Holin融合蛋白真核表达载体，通过细胞感染模型研究其在胞内对结核分枝杆菌的杀伤效果。 方法 构建原核重组质粒pET32a-LysinB并诱导表达，纯化蛋白后制备多克隆抗体；构建真核重组质粒pcDNA3.1(＋)-LysinB/Holin并转染进单核巨噬细胞RAW264.7，经制备的LysinB多克隆抗体进行表达鉴定后，建立细胞感染模型并通过抗酸染色和菌落计数检测LysinB/Holin融合蛋白的杀菌效果。 结果 成功制备LysinB的多克隆抗体。重组质粒pcDNA3.1(＋)-LysinB/Holin在真核细胞中有效表达LysinB/Holin融合蛋白且对细胞无明显毒性。LysinB/Holin融合蛋白可有效杀伤胞内的结核分枝杆菌。 结论 重组质粒pcDNA3.1(＋)-LysinB/Holin对胞内结核分枝杆菌有较好的杀伤效果，且对细胞无明显毒性，具有治疗结核病的潜能。 Objective To construct a eukaryotic expression vector for bacteriophage D29 LysinB/Holin fusion protein and study its bactericidal efficacy against Mycobacterium tuberculosis (Mtb) in a cell infection model. Methods A recombinant plasmid pET32a-LysinB was constructed and induced to express LysinB. The polyclonal antibody against LysinB was prepared after the purification of LysinB. A recombinant plasmid pcDNA3.1(+ )-LysinB/Holin was constructed and transfected into mononuclear macrophages RAW264.7. After the expression of the prepared polyclonal antibody was identified, a cell infection model was established and the bactericidal efficacy of LysinB/Holin fusion protein was measured by acid-fast staining and colony counting. Results The polyclonal antibody against LysinB was successfully prepared. The recombinant plasmid pcDNA3.1(+ )-LysinB/Holin could effectively express LysinB/Holin fusion protein in eukaryotic cells without inducing significant cytotoxicity. LysinB/Holin fusion protein was effective in killing Mtb in cells. Conclusions The recombinant plasmid pcDNA3.1(+ )-LysinB/Holin has a better killing effect on intracellular Mtb without inducing obvious cytotoxicity against eukaryotic cells, showing a potential in the treatment of tuberculosis.
Construction of eukaryotic expression vector for bacteriophage D29 LysinB/Holin and analysis of its bactericidal activity
Objective To construct a eukaryotic expression vector for bacteriophage D29 LysinB/Holin fusion protein and study its bactericidal efficacy against Mycobacterium tuberculosis (Mtb) in a cell infection model. Methods A recombinant plasmid pET32a-LysinB was constructed and induced to express LysinB. The polyclonal antibody against LysinB was prepared after the purification of LysinB. A recombinant plasmid pcDNA3.1(+ )-LysinB/Holin was constructed and transfected into mononuclear macrophages RAW264.7. After the expression of the prepared polyclonal antibody was identified, a cell infection model was established and the bactericidal efficacy of LysinB/Holin fusion protein was measured by acid-fast staining and colony counting. Results The polyclonal antibody against LysinB was successfully prepared. The recombinant plasmid pcDNA3.1(+ )-LysinB/Holin could effectively express LysinB/Holin fusion protein in eukaryotic cells without inducing significant cytotoxicity. LysinB/Holin fusion protein was effective in killing Mtb in cells. Conclusions The recombinant plasmid pcDNA3.1(+ )-LysinB/Holin has a better killing effect on intracellular Mtb without inducing obvious cytotoxicity against eukaryotic cells, showing a potential in the treatment of tuberculosis.
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