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| 1 | 重组结核分枝杆菌PPE65蛋白的制备及其在肺结核诊断中的价值显示文摘目的 评价重组PPE65蛋白IgG抗体用于检测肺结核患者的价值.方法 将编码结核分枝杆菌PPE65蛋白的基因克隆到PET-28a载体,并在大肠埃希菌中表达,镍亲和层析和离子层析法纯化重组PPE65蛋白,透析复性和Lowry法测蛋白浓度.采用ELISA法检测144例肺结核患者、144名健康者、56例非结核肺部疾病患者血清中抗重组PPE65蛋白和重组PstS1蛋白的IgG抗体水平.用ELISA检测144例肺结核患者和97名PPD皮试阴性健康人血清IgG结果绘制ROC曲线确定临界值.分析评价重组PPE65蛋白及其与重组PstS1蛋白联合检测肺结核的敏感度、特异度、阳性预测值、阴性预测值、准确性.结果 结核分枝杆菌PPE65蛋白在大肠埃希菌中获得表达,层析纯化获得纯度为95%的重组PPE65蛋白,复性后蛋白浓度为0.5 mg/ml.重组PPE65蛋白IgG抗体的ELISA检测临界值为0.64.重组PPE65蛋白诊断肺结核的敏感度、特异度、阳性预测值、阴性预测值、准确性分别为34.7%(50/144)、93.5%(187/200)、79.4%(50/63)、66.5%(187/281)、68.9%(237/344);重组PPE65蛋白和重组PstS1蛋白联合诊断肺结核的敏感度、特异度、阳性预测值、阴性预测值、准确性分别为59.0%(85/144)、91.0%(182/200)、82.5%(85/103)、75.5%(182/241)、77.6%(267/344).结论 结核分枝杆菌PPE65蛋白可作为结核患者血清检测的蛋白抗原之一.PPE65蛋白和重组PstS1蛋白IgG抗体联合检测用于结核病诊断可提高敏感度. | 何秀云 黄香玉 郝娟 赵雅贞 马龙凤 葛林虎 庄玉辉 | 2011 | 中华检验医学杂志2011，34，7： | 5 |
| 2 | Cloning and Bioinformatics Analysis of pepck Gene in Vibrio alginolyticus显示文摘[Objectives]To clone the pepck gene of Vibrio alginolyticus strain HY9901 and analyze its sequence by bioinformatics.[Methods]According to the complete gene sequence of V.alginolyticus on GenBank,specific primers were designed to amplify the target gene pepck by PCR.The sequence of the pepck gene was analyzed using bioinformatics.The phylogenic tree of pepck gene and the corresponding single-subunit three-dimensional structure were constructed.[Results]The pepck gene of V.alginolyticus strain HY9901 has a full length of 1629 bp,with theoretical molecular weight of 60.12 kD.The prediction results show that there is no signal peptide or transmembrane region at the N-terminus of the sequence,the amino acid sequence contains 11 phosphorylation sites of casein kinase II.The prediction results of protein subcellular localization indicate that PEPEK protein is localized in the cytoplasm.The protein is stable and hydrophobic.The tertiary structure of the PEPCK protein of V.alginolyticus is similar to that of Vibrio parahaemolyticus.It is predicted that PEPCK has a major functional domain PEPCK_ATP.In the secondary structure,alpha helix,random coil,and extended strand accounted for 21.96%,52.03%and 26.01%,respectively.The PEPCK homology between V.alginolyticus and Vibrio diabolicus is as high as 99%.[Conclusions]This study lays the foundation for further understanding the function of pepck gene in V.alginolyticus. | Fuyuan ZENG Yin ZHAO Shihui ZHOU Chuanhao PAN Miao XIE Huanying PANG | 2020 | Asian Agricultural Research2020，12，8： | 0 |
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