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《中国生物制品学杂志》2017,(1)
目的评价甘露寡糖修饰布氏菌Rsα蛋白的生物活性。方法经1-乙基-3-(3-二甲基氨丙基)碳二亚胺(EDC)/N-羟基琥珀酰亚胺(NHS)化学偶联法,用4种甘露寡糖(甘露三糖、甘露四糖、甘露五糖及甘露六糖)对Rsα蛋白按不同摩尔比进行寡糖修饰。FITC荧光标记4种甘露寡糖修饰Rsα蛋白后,作用于RAW264.7细胞,荧光显微镜观察细胞对荧光的吞噬情况;流式细胞术检测细胞对蛋白的吞噬率。结果甘露寡糖与蛋白投料摩尔比达1 000∶1时获得的反应产物较稳定。甘露五糖修饰的Rsα蛋白被巨噬细胞吞噬的速度最快,其细胞吞噬率最高(25.89%)。结论筛选出五糖修饰的Rsα蛋白具有较高的生物活性,为研究其作为布氏菌糖蛋白候选疫苗的可行性奠定了基础。 相似文献
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腐植酸分子结构与生物活性的关系 总被引:4,自引:1,他引:4
俄罗斯煤化学家那乌莫娃在腐植酸(HA)的化学改性和组成结构研究方面进行了多年卓有成效的研究,这篇论文反映了作者研究工作的最新进展。她通过化学分析、光谱解析和植物生长刺激性试验,发现HA的多共轭芳香结构、具有给-受电子性及离子交换性的结构,以及官能团的氢键缔合体系,都对生物效应有重要影响,而且都在HA的顺磁性上有所反映—官能团含量越多,多共轭芳香体系越发达,顺磁性水平越高,生物活性也越高。据此,表现在不同原料来源及不同化学改性的HA具有不同的生物活性,其活性大小的次序大致为:氧化改性的褐煤HA>原料褐煤HA≈催化氧化泥炭HA>非催化氧化泥炭HA≈水解泥炭HA>原料泥炭HA。研究还认为,与HA官能团结合的可变价金属(如Fe)对顺磁性和生物活性因素也有一定影响。作者最后得出结论:可利用电子自旋共振谱(ESR)测定的顺磁性水平来估价HA类制剂的生物活性。当前,国内HA(FA)类生物活性制剂的研究和产品开发已成为热点课题,那乌莫娃的研究结果可能对我们有一定参考价值。现全文译出,以飨读者。 相似文献
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酰基硫脲类化合物的生物活性研究进展 总被引:3,自引:1,他引:2
酰基硫脲类化合物具有广泛的生物活性,可作为除草剂、杀菌剂及植物生长调节剂等。本文简要综述了近年来该类化合物生物活性的研究近况。 相似文献
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Dr. Arundhati Roy Prof. Pinaki Talukdar 《Chembiochem : a European journal of chemical biology》2021,22(20):2925-2940
Several life-threatening diseases, also known as ‘Channelopathies’ are linked to irregularities in ion transport proteins. Significant research efforts have fostered the development of artificial transport systems that facilitates to restore the functions of impaired natural transport proteins. Indeed, a few of these artificial ionophores demonstrate the rare combination of transmembrane ion transport and important biological activity, offering early promises of suitability in ‘channel replacement therapy’. In this review, structural facets and functions of both cationophores and anionophores are discussed. Ionophores that are toxic to various bacteria and yeast, could be exploited as antimicrobial agent. Nevertheless, few non-toxic ionophores offer the likelihood of treating a wide range of genetic diseases caused by the gene mutations. In addition, their ability to disrupt cellular homeostasis and to alter lysosomal pH endow ionophores as promising candidates for cancer treatment. Overall, critically outlining the advances in artificial ionophores in terms of in vitro ion transport, possible modes of action and biological activities enables us to propose possible future roadmaps in this research area. 相似文献
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酰腙类化合物由于其广泛的生物活性,在农药与医药研究领域占有重要的地位。主要用作杀虫剂、杀菌剂、除草剂、消炎剂、镇痛剂。多年来酰腙类化合物的合成和生物活性研究一直是精细化工领域研究开发的重要方向之一。本文综述了近年来该类化合物生物活性方面的研究近况。 相似文献
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Recent statistics from the World Health Organization indicate that a high percentage of people worldwide suffer from a wide variety of acute or cancer‐associated chronic pain. At present, with a few exceptions, the treatment of severe pain relies upon oral administration of the μ‐opioid receptor‐targeting opiate morphine and its surrogates under strict clinical control. In spite of the powerful in vivo efficacy of these drugs, their long‐term use is limited by antinociceptive tolerance, physical dependence, and respiratory depression that evolve. As no analgesics with moderate side effect profiles are currently available for the therapy of different types of pain and stages of cancer, considerable efforts must be made in the search for opiate substitutes. Following the recognition that endogenous peptide ligands of the opioid receptors exert striking effects in various pain models, and with the recent advances in chemical synthesis methods, research interest has steadily moved toward peptide‐based compounds as potential opioid analgesics. The endomorphins are an attractive set of endogenous opioid peptides that may meet the requirements of opioid‐based pain management. By virtue of their excellent μ‐opioid receptor labeling and favorable analgesic properties, these tetrapeptides have gained attention in recent years as potential lead compounds. The ever‐increasing number of publications in this field strongly suggests that modified analogues of endomorphins could serve as potent substitutes for opiates, with a lower propensity to induce side effects. This review surveys the main results achieved over the past decade regarding the design, radiolabeling, pharmacological characterization, and structure–activity features of a large body of endomorphin derivatives. 相似文献