高效液相色谱法测定重组人干扰素α1b滴眼液中苯扎氯铵的含量

目的采用高效液相色谱法(high performance liquid chromatography,HPLC)测定重组人干扰素α1b(recombi-nant human interferonα1b,rhIFNα1b)滴眼液中苯扎氯铵(benzalkonium chloride)的含量。方法采用HPLC法测定rhIFNα1b滴眼液中苯扎氯铵含量,色谱条件:流动相:乙腈:5 mmol/L醋酸铵[含1%三乙胺,用冰醋酸调节pH值至(5.0±0.2)]体积比为65∶35;流速:1.0 ml/min;检测波长:262 nm;进样量20μl;柱温:室温。对该方法进行验证,并应用该方法检测3批rhIFNα1b滴眼液中苯扎氯铵的含量。结果该方法检测苯扎氯铵专属性和系统适应性良好;最低检测限和定量限分别为0.53μg/ml和1.48μg/ml;苯扎氯铵在10～50μg/ml浓度范围内,标准曲线的线性关系良好,R2=0.999 1;连续6次进样,峰面积的RSD=1.78%;苯扎氯铵理论浓度为22、24、26μg/ml的加样回收率平均为97.90%,RSD=0.96%。3批rhIFNα1b滴眼液中苯扎氯铵的相对含量分别为19.27、19.89和19.76μg/ml,分别为标示量的96.34%、94.46%和98.80%。结论 HPLC法简便、灵敏、准确,可用于测定rhIFNα1b滴眼液中苯扎氯铵的含量。     

重组人组织型纤溶酶原激活剂改构体质控方法的建立

目的建立重组人组织型纤溶酶原激活剂(tissue type plasminogen activator,tPA)改构体(TNK-tPA)的质控方法。方法采用气泡法测定TNK-tPA原液的生物学活性,非还原SDS-PAGE和RP-HPLC法测定其纯度,还原型SDS-PAGE确定其相对分子质量,HPLC-SEC法测定其单链含量,胰酶裂解法分析其肽图,Edman降解法测定其N-末端氨基酸序列,毛细管等电聚焦电泳法测定其等电点,Lowrry法测定其蛋白质含量,地高辛法测定其外源DNA残留量。按《中国药典》三部(2005版)要求,对TNK-tPA成品进行鉴别试验及外观、pH值、水分含量、无菌、装量、异常毒性等检测。结果 3批TNK-tPA原液的生物学活性为(2.09～2.16)×106U/ml,比活性均大于3.5×105U/mg,因此确定TNK-tPA原液的比活性不得低于3.0×105U/mg。3批TNK-tPA原液的非还原型SDS-PAGE纯度均大于98.0%,RP-HPLC纯度均大于97.0%;经还原型SDS-PAGE分析可见两条带,相对分子质量分别为68 000和35 000;样品原液的单链含量为75.7%;3批TNK-tPA原液的肽图酶切图谱与理化参考品一致;TNK-tPA原液的N-末端氨基酸序列、等电点、蛋白质含量、外源DNA残留量及成品的鉴别试验结果、外观、pH值、水分含量、无菌、装量、异常毒性等均符合《中国药典》三部(2005版)要求。结论建立的质控方法可保证产品安全、有效、质量可控,可用于TNK-tPA产品的常规检定。     

Optimization and Application of CRISPR/Cas9 Genome Editing in a Cosmopolitan Pest,Diamondback Moth

The CRISPR/Cas9 system is an efficient tool for reverse genetics validation, and the application of this system in the cell lines provides a new perspective on target gene analysis for the development of biotechnology tools. However, in the cell lines of diamondback moth, Plutella xylostella, the integrity of the CRISPR/Cas9 system and the utilization of this cell lines still need to be improved to ensure the application of the system. Here, we stabilize the transfection efficiency of the P. xylostella cell lines at different passages at about 60% by trying different transfection reagents and adjusting the transfection method. For Cas9 expression in the CRIPSPR/Cas9 system, we identified a strong endogenous promoter: the 217–2 promoter. The dual-luciferase and EGFP reporter assay demonstrated that it has a driving efficiency close to that of the IE1 promoter. We constructed pB-Cas9-Neo plasmid and pU6-sgRNA plasmid for CRISPR/Cas9 system and subsequent cell screening. The feasibility of the CRISPR/Cas9 system in P. xylostella cell lines was verified by knocking out endogenous and exogenous genes. Finally, we generated a transgenic Cas9 cell line of P. xylostella that would benefit future exploitation, such as knock-in and multi-threaded editing. Our works provides the validity of the CRISPR/Cas9 system in the P. xylostella cell lines and lays the foundation for further genetic and molecular studies on insects, particularly favoring gene function analysis.     

细菌内毒素重组C因子检测方法的验证

目的验证细菌内毒素重组C因子检测法。方法根据《中国药典》四部(2015版)9101药品质量分析方法验证指导原则的规定,对细菌内毒素重组C因子检测法(Lonza和Hyglos两种试剂盒)的线性范围、准确度、精密性、专属性、检测限及耐用性进行验证,并与动态显色法进行比较。结果 2种方法在内毒素标准品为0. 005～5 EU/mL范围内与logδRFU均呈良好的线性关系,r均> 0. 980;高、中、低浓度内毒素标准品2种方法检测回收率的平均值差异均无统计学意义(P> 0. 05);精密度各有优劣,总体相当;重组C因子不与β-葡聚糖发生反应,动态显色法检测β-葡聚糖浓度为0. 55 EU/mL;检测限均为0. 005 EU/mL;斜率和实测值不受增益值改变的影响,截距和增益值呈正相关。结论重组C因子法具有良好的准确度、精密性、专属性及耐用性,可应用于生物制品的细菌内毒素检查。     

重组人骨形态发生蛋白7成熟蛋白在悬浮CHO-S细胞中的稳定表达

目的在悬浮CHO-S细胞中稳定表达重组人骨形态发生蛋白7(recombinant human bone morphgenetic protein7,rhBMP7)成熟蛋白。方法应用RT-PCR技术从BALB/c乳鼠股骨组织扩增mbmp7基因,克隆至质粒pMD18-T,通过定点突变3个氨基酸编码序列(G266S、S287N、D359E),得到重组克隆质粒pMD18-mbmp7_m3;将mbmp7_m3克隆至表达载体pCHO1. 0,构建重组表达质粒pCHO-mbmp7_m3,转染CHO-S细胞,利用嘌呤霉素和甲氨蝶呤进行两轮加压筛选,有限稀释法筛选单克隆细胞,ELISA法检测rhBMP7成熟蛋白的表达。结果从乳鼠股骨组织扩增的cDNA经测序与GenBank中登录的序列完全一致,点突变后测序与设计完全一致。获得了稳定表达rhBMP7成熟蛋白的单克隆细胞株,最高表达量为202 ng/mL。结论成功利用改造的mbmp7基因在CHO-S细胞中表达了rhBMP7成熟蛋白,为后续该制品工艺开发及产业化奠定了基础。     

Bacterial hydrogen production in recombinant Escherichia coli harboring a HupSL hydrogenase isolated from Rhodobacter sphaeroides under anaerobic dark culture

In this study, recombinant plasmid was constructed to analyze the effect of hydrogen production on the expression HupSL hydrogenase isolated from Rhodobacter sphaeroides in Escherichia coli. Although most of recombinant HupSL hydrogenase was produced as inclusion bodies the solubility of the protein increased significantly when the expression temperature shifted from 37 °C to 30 °C. Hydrogen production by expression of HupSL hydrogenase from recombinant E. coli increased 20.9-fold compared to control E. coli and 218-fold compared to wild type R. sphaeroides under anaerobic dark condition. The results demonstrate that HupSL hydrogenase, consisting of small and large subunits of hydrogenase isolated from R. sphaeroides, increases hydrogen production in recombinant E. coli. In addition conditions for enhancing the activity of HupSL hydrogenase in E. coli were suggested and were used to increase bacterial hydrogen production.     

一种改进的用高拷贝质粒制备BAC载体的新方法

介绍了一种改进的使用高拷贝质粒制备BAC载体的简便有效的方法，我们同时使用从高拷贝质粒pCUGIBACl制备的和用传统方法从单拷贝质粒pIndigoBAC-5制备的两种载体，比较了这两种载体与玉米大片段DNA连接所构建的BAC文库。结果表明在使用这两种BAC载体构建的BAC文库中，所获得的转化体数目，及在BAC克隆中插入的DNA片段的大小和BAC克隆的稳定性等方面都相同，从而证明本文所介绍的从高拷贝质粒pCUGIBACl来制备BAC载体是一种更方便的方法，它能使BAC文库的构建更为高效。     

重组鲈鱼生长激素的酶联免疫测定方法

建立了重组鲈鱼生长激素（jspGH0的间接ELISA，以jspGH的小鼠多克隆抗体作为一抗，HRP羊抗鼠IgG作为二抗，在抗体及酶标二抗的稀释液中加入4％PEG，从而提高检测灵敏度至40ng/ml，抗原浓度在40－1000ng/ml范围内与OD450nm值成线性关系。此法较简便，灵敏，可用于检测基因工程菌发酵液中的jspGH含量。     

APS作为重组(CHO细胞)乙型肝炎疫苗佐剂的安全性及免疫效果

目的 探讨黄芪多糖（APS）作为重组（CHO细胞）乙肝疫苗免疫佐剂的可行性。方法APS与重组（CHO细胞）乙肝病毒表面抗原（HBsAg）混合制成疫苗,进行了动物毒性试验、过敏试验及效力试验。结果 该佐剂毒性轻微,无过敏反应,同一剂量组动物血清抗-HBs阳转率高于Al（OH）3对照组。结论APS是一种很有潜力的疫苗佐剂。     

Overproduction of EcoRI and SpA::EcoRI fusion protein by Escherichia coli employing the combinations of three different types of multicopy plasmids: Comparison of plasmid stabilities and product concentrations

The copy numbers of the expression plasmids (pRTF309 + and pMTC48), the repression plasmids (pcI857 and pRK248cI) and the protection plasmid (pEcoR4) in recombinant E. coli JM103 were investigated. In the absence of the protection plasmid, the copy number of the expression plasmid dropped; in its presence, the copy numbers of the expression plasmids increased after gene expression by temperature-shift induction. The copy numbers of the repression plasmids were not influenced by the presence or absence of the protection plasmid. The copy numbers of the latter were not changed during temperature-induced gene expression. In the absence of the protection plasmid, the product concentration (EcoRI enzyme activity) was very low. With the plasmid combination pRTF309 +, pRK248cI, and pEcoR4, the enzyme (EcoRI) activity was higher, but with the plasmid combination pMTC48, pRK248cI, pEcoR4, the enzyme (SpA::EcoRI) activity was highest.