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《中国生物制品学杂志》2017,(2)
目的制备呋喃妥因代谢物AHD单克隆抗体,并进行鉴定。方法利用对羧基苯甲醛合成1-氨基乙内酰胺脲(AHD)的衍生物1-氨基乙内酰脲-4-羧苯基肟(4-CPAHD),通过活性脂法将4-CPAHD与牛血清白蛋白(BSA)和卵清蛋白(OVA)偶联,获得免疫抗原4-CPAHD-BSA和包被抗原4-CPAHD-OVA,采用紫外分光光度法检测偶联是否成功。将人工合成抗原4-CPAHD-BSA免疫BALB/c小鼠,通过杂交瘤技术将免疫小鼠脾脏细胞与Sp2/0骨髓瘤细胞融合,筛选能稳定产生抗体的细胞株;通过间接ELISA法检测该细胞株分泌的单克隆抗体的效价、邻硝基-PAHD(2-NPAHD)对单克隆抗体的半数抑制浓度(IC50),并分析抗体的特异性。结果偶联后4-CPAHD-BSA的最大吸收峰有较明显的偏移,表明4-CPAHD与BSA偶联成功,平均偶联比为17.4∶1。制备的单克隆抗体的效价为1∶64 000,2-NPAHD对单克隆抗体的IC50为1.45μg/L,单克隆抗体与同类抗生素及其代谢物无交叉反应。结论制备的AHD单克隆抗体各项指标均较好,为呋喃妥因代谢物免疫检测试剂的研发奠定了基础。 相似文献
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《中国生物制品学杂志》2014,(7)
目的制备呋喃唑酮代谢物AOZ单克隆抗体及其胶体金与荧光淬灭免疫层析试纸条。方法将AOZ衍生成CPAOZ后,与载体蛋白BSA偶联,制备完全抗原CPAOZ-BSA,经皮下多点注射免疫BALB/c小鼠,共5次,取小鼠脾细胞与SP2/0细胞融合,获得稳定分泌特异性抗体的杂交瘤细胞株。利用获得的抗CPAOZ单克隆抗体制备胶体金及荧光淬灭免疫层析试纸条,并对试纸条的灵敏度及特异性进行验证。结果制备的完全抗原经紫外扫描鉴定偶联成功。共获得3株能稳定分泌抗CPAOZ单克隆抗体的杂交瘤细胞株,其中效价和特异性最好的1株2H11针对CPAOZ的50%抑制质量浓度(IC50)为0.88 ppb。以该抗体制备的胶体金及荧光淬灭免疫层析试纸条的最低检测限分别为7.5和0.062 5 ppb;两种试纸条与其他3种硝基呋喃类代谢物CPAMOZ、CPAHD、CPSEM均不存在交叉反应。结论成功制备了抗CPAOZ单抗及其胶体金免疫层析和荧光淬灭免疫层析试纸条,两种试纸条均具有较高的灵敏度和较强的特异性,其中荧光淬灭免疫层析试纸条的灵敏度较胶体金免疫层析试纸条高约100倍,具有良好的应用前景。 相似文献
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《制药原料及中间体信息》2008,(4)
到目前为止,已发现了一系列颇有价值的免疫激活剂,其中包括:微生物代谢物类免疫激活剂、植物类免疫激活剂以及尚未确定具体活性成分但肯定有提高人体免疫力的植物及其提取物。 相似文献
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目的优化肺炎链球菌CSR SCS2 clone1小鼠的免疫程序,同时建立肺炎链球菌C多糖(C polysaccharides,CPs)杂交瘤细胞株。方法制备免疫抗原CSR SCS2 clonel,进行小鼠免疫程序优化:抗原量[(0. 5~2)×10~8个、(1~4)×108个、(2. 4~10)×10~8个)]、免疫间隔时间(3 d、1周、2周)、免疫途径(腹腔、腹股沟及尾静脉),同时确定抗原是否添加佐剂,间接ELISA法检测小鼠血清抗体水平。采用优化程序免疫小鼠,取血清效价最高的小鼠脾细胞,经传统单克隆抗体制备技术建立肺炎链球菌C-Ps杂交瘤细胞株,并检测细胞株的染色体数目及其分泌抗体的稳定性及特异性。结果确定小鼠最适免疫程序为:抗原量为(1~4)×108个,且需添加弗氏佐剂,免疫间隔时间为1周,免疫途径为腹股沟注射。最适程序免疫小鼠血清抗体效价达1∶12 000以上。建立了3株肺炎链球菌C-Ps杂交瘤细胞,命名为A4、G8、H10株,染色体数目分别为98、102和102,分泌的抗体具有良好的稳定性和特异性。结论成功优化了肺炎链球菌小鼠的免疫程序,并建立了肺炎链球菌C-Ps杂交瘤细胞株,为肺炎链球菌荚膜多糖中C-Ps含量检测方法的建立奠定了基础。 相似文献
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《中国生物制品学杂志》2017,(3)
目的制备可高效、特异性富集肠出血性E.coli O157(enterohemorrhagic Escherichia coli O157,EHEC O157)的免疫磁珠。方法分别用5种不同规格磁珠与E.coli O157特异性单克隆抗体偶联制备免疫磁珠,通过比较磁珠蛋白偶联量,选取包被效果最佳的磁珠规格;对制备工艺进行优化(包括活化时间、温度,偶联缓冲液p H值,偶联温度、时间);对制备的O157免疫磁珠选择性集菌的敏感性和特异性进行评价,并与进口磁珠吸附率进行比较。结果直径0.5~1.0μm羧基磁珠抗体包被效果及目的菌分离效果最好。加入NHS后,活化30 min为最佳时间;4℃磁珠活化温度、0.01 mol/L PBS(p H 7.4)构成的体系对磁珠偶联单克隆抗体效果最佳;偶联温度为37℃、偶联时间为120 min时,偶联蛋白量最高,且波动范围较小,为最佳偶联温度及时间。在复杂的微生物环境中,O157免疫磁珠的敏感性达到20 CFU/ml。在混合菌液中,E.coli O157菌含量在1.4×10~3 CFU/ml时,免疫磁珠特异性捕获率达到90%。结论获得羧基磁珠与E.coli O157单克隆抗体偶联的最佳条件。制备的免疫磁珠能够特异性富集EHEC O157,具有操作简便,分离速度快,捕获率高等特点,可用于临床样品或食品中EHEC O157的分离鉴定。 相似文献
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Dr. Hannah K. D'Ambrosio Aaron M. Keeler Prof. Emily R. Derbyshire 《Chembiochem : a European journal of chemical biology》2023,24(17):e202300263
Natural product discovery has traditionally relied on the isolation of small molecules from producing species, but genome-sequencing technology and advances in molecular biology techniques have expanded efforts to a wider array of organisms. Protists represent an underexplored kingdom for specialized metabolite searches despite bioinformatic analysis that suggests they harbor distinct biologically active small molecules. Specifically, pathogenic apicomplexan parasites, responsible for billions of global infections, have been found to possess multiple biosynthetic gene clusters, which hints at their capacity to produce polyketide metabolites. Biochemical studies have revealed unique features of apicomplexan polyketide synthases, but to date, the identity and function of the polyketides synthesized by these megaenzymes remains unknown. Herein, we discuss the potential for specialized metabolite production in protists and the possible evolution of polyketide biosynthetic gene clusters in apicomplexan parasites. We then focus on a polyketide synthase from the apicomplexan Toxoplasma gondii to discuss the unique domain architecture and properties of these proteins when compared to previously characterized systems, and further speculate on the possible functions for polyketides in these pathogenic parasites. 相似文献
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[目的]为了证实SPRI-90827菌株所产生的次级代谢物生物活性,针对活性组分进行结构鉴定以及做了大量室内和田间生物测定试验.[结果]发现其活性组分的分子式为C17H26N8O5,结构式和灭瘟素(blasticidin-S)相仿.同时发现放线菌SPRI-90827所产生的次级代谢产物具有较强的杀菌活性.[结论]此化合物虽与灭瘟素结构相同,但在生物活性方面出现了显著不同,令人关注. 相似文献
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Hanaa Adsi Shon A. Levkovich Elvira Haimov Topaz Kreiser Massimiliano Meli Hamutal Engel Luba Simhaev Shai Karidi-Heller Giorgio Colombo Ehud Gazit Dana Laor Bar-Yosef 《International journal of molecular sciences》2021,22(17)
The formation of amyloid-like structures by metabolites is associated with several inborn errors of metabolism (IEMs). These structures display most of the biological, chemical and physical properties of protein amyloids. However, the molecular interactions underlying the assembly remain elusive, and so far, no modulating therapeutic agents are available for clinical use. Chemical chaperones are known to inhibit protein and peptide amyloid formation and stabilize misfolded enzymes. Here, we provide an in-depth characterization of the inhibitory effect of osmolytes and hydrophobic chemical chaperones on metabolite assemblies, thus extending their functional repertoire. We applied a combined in vivo-in vitro-in silico approach and show their ability to inhibit metabolite amyloid-induced toxicity and reduce cellular amyloid content in yeast. We further used various biophysical techniques demonstrating direct inhibition of adenine self-assembly and alteration of fibril morphology by chemical chaperones. Using a scaffold-based approach, we analyzed the physiochemical properties of various dimethyl sulfoxide derivatives and their role in inhibiting metabolite self-assembly. Lastly, we employed whole-atom molecular dynamics simulations to elucidate the role of hydrogen bonds in osmolyte inhibition. Our results imply a dual mode of action of chemical chaperones as IEMs therapeutics, that could be implemented in the rational design of novel lead-like molecules. 相似文献
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近年来,人们对植物的次级代谢过程以及代谢产物进行了研究,并取得了较大的进展,研究表明,可以用基因编码的生物合成酶和基因编码的诱变蛋白来改变不同的合成路径,而且还使用抗敏抑制竞争性路径,依此来提高目标次级代谢产物的产率^[1]。 相似文献
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Yu-Wen Kao Sheng-Kai Hsu Jeff Yi-Fu Chen I-Ling Lin Kuo-Jen Chen Po-Yen Lee Hui-Suan Ng Chien-Chih Chiu Kai-Chun Cheng 《International journal of molecular sciences》2021,22(1)
Curcumin is one of the most valuable natural products due to its pharmacological activities. However, the low bioavailability of curcumin has long been a problem for its medicinal use. Large studies have been conducted to improve the use of curcumin; among these studies, curcumin metabolites have become a relatively new research focus over the past few years. Additionally, accumulating evidence suggests that curcumin or curcuminoid metabolites have similar or better biological activity than the precursor of curcumin. Recent studies focus on the protective role of plasma tetrahydrocurcumin (THC), a main metabolite of curcumin, against tumors and chronic inflammatory diseases. Nevertheless, studies of THC in eye diseases have not yet been conducted. Since ophthalmic conditions play a crucial role in worldwide public health, the prevention and treatment of ophthalmic diseases are of great concern. Therefore, the present study investigated the antioxidative, anti-inflammatory, antiangiogenic, and neuroprotective effects of THC on four major ocular diseases: age-related cataracts, glaucoma, age-related macular degeneration (AMD), and diabetic retinopathy (DR). While this study aimed to show curcumin as a promising potential solution for eye conditions and discusses the involved mechanistic pathways, further work is required for the clinical application of curcumin. 相似文献
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Frederique Bravin Radu C. Duca Patrick Balaguer Marcel Delaforge 《International journal of molecular sciences》2009,10(4):1824-1837
The mycoestrogen zearalenone (ZEN), as well as its reduced metabolites, which belong to the endocrine disruptor bio-molecule family, are substrates for various enzymes involved in steroid metabolism. In addition to its reduction by the steroid dehydrogenase pathway, ZEN also interacts with hepatic detoxification enzymes, which convert it into hydroxylated metabolites (OH-ZEN). Due to their structures to that of estradiol, ZEN and its derived metabolites bind to the estrogen receptors and are involved in endocrinal perturbations and are possibly associated with estrogen-dependent cancers. The primary aim of this present study was to identify the enzymatic cytochrome P450 isoforms responsible for the formation of the most abundant OH-ZEN. We thus studied its in vitro formation using hepatic microsomes in a range of animal model systems including man. OH-ZEN was also recovered in liver and urine of rats treated orally with ZEN. Finally we compared the activity of ZEN and its active metabolites (α-ZAL and OH-ZEN) on estrogen receptors using HeLa ER-α and ER-β reporter cell lines as reporters. OH-ZEN estrogenic activities were revealed to be limited and not as significant as those of ZEN or α-ZAL. 相似文献
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Stephan A. Sieber Dr. 《Chembiochem : a European journal of chemical biology》2009,10(5):799-801
Saghatelian and colleagues recently introduced a global metabolite‐profiling approach that allows protein–metabolite interactions (PMI) to be identified. This approach represents an excellent strategy and valuable tool for unraveling the many secrets of the metabolome. The key features of the methodology will be summarized here.