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91.
Li Tao Tang Xiaolu Wu Changcheng Yao Xinmin Wang Yirong Lu Xuemei Lu Jian 《中国科学:生命科学英文版》2020,63(10):1608-1611
正Dear Editor,The coronavirus disease 2019 (COVID-19) caused by the SARS-CoV-2 coronavirus has become a global pandemic.The SARS-CoV-2 genome has a similarity of 96.2%to that of RaTG13, a bat SARS-CoV-2-related coronavirus detected in Rhinolophus affinis (Paraskevis et al., 2020; Zhou et al.,2020). The SARS-CoV-2 genome also has 85.5%-92.4% 相似文献
92.
Mingyu Lv Jiawen Wang Jingyao Zhang Biao Zhang Xiaodan Wang Yingzi Zhu Tao Zuo Donglai Liu Xiaojun Li Jiaxin Wu Haihong Zhang Bin Yu Hui Wu Xinghong Zhao Wei Kong Xianghui Yu 《PloS one》2014,9(10)
BST-2 blocks the particle release of various enveloped viruses including HIV-1, and this antiviral activity is dependent on the topological arrangement of its four structural domains. Several functions of the cytoplasmic tail (CT) of BST-2 have been previously discussed, but the exact role of this domain remains to be clearly defined. In this study, we investigated the impact of truncation and commonly-used tags addition into the CT region of human BST-2 on its intracellular trafficking and signaling as well as its anti-HIV-1 function. The CT-truncated BST-2 exhibited potent inhibition on Vpu-defective HIV-1 and even wild-type HIV-1. However, the N-terminal HA-tagged CT-truncated BST-2 retained little antiviral activity and dramatically differed from its original protein in the cell surface level and intracellular localization. Further, we showed that the replacement of the CT domain with a hydrophobic tag altered BST-2 function possibly by preventing its normal vesicular trafficking. Notably, we demonstrated that a positive charged motif “KRXK” in the conjunctive region between the cytotail and the transmembrane domain which is conserved in primate BST-2 is important for the protein trafficking and the antiviral function. These results suggest that although the CT of BST-2 is not essential for its antiviral activity, the composition of residues in this region may play important roles in its normal trafficking which subsequently affected its function. These observations provide additional implications for the structure-function model of BST-2. 相似文献
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94.
Huanan Wen Jiaxin Zhong Bei Shen Tao Gan Chao Fu Zhihong Zhu Rui Li Xu Yang 《生物学前沿》2013,8(4):444-450
To compare the cytotoxicity on HeLa cells induced by nanosized and microsized tellurium powders, HeLa cells were exposed to different concentrations of tellurium powders (0, 50, 100, 150 and 200 μg/mL) for 12 h. In this study, detection of a series of biomarkers, including reactive oxygen species (ROS), glutathione (GSH), 8-hydroxy-2′-deoxyguanosine (8-OHdG), in addition to DNA and protein crosslink (DPC) and MTTassay, were conducted to evaluate the cytotoxicity. It is indicated that compared with the control group, there was no significant difference in the induced cytotoxicity at concentrations lower than 50 μg/mL for both nanosized and microsized tellurium powders. While there appears a significant difference in the induced cytotoxicity for nanosized tellurium powders when the concentration is higher than 100 μg/mL as well as for microsized tellurium powders when the concentration is higher than 200 μg/mL. Moreover, it is found that the cytotoxicity induced on HeLa cells exhibits a certain dose-effect relationship with the concentration of tellurium powders. A conclusion has been reached that the toxicity on HeLa cells can be induced by both nanosized and microsized tellurium powders, and the toxicity of the nanosized tellurium powders is significantly greater than the microsized one. 相似文献
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96.
以蚕豆幼苗为实验材料,采用水培法研究不同浓度(0、2、4、8、16 mg·L~(-1))羟基化多壁碳纳米管(MWCNTs-OH)与10μmol·L~(-1)镉(Cd)单一和联合作用对蚕豆幼苗根系生长、生理及Cd含量的影响。结果表明:(1)单一MWCNTs-OH处理下,随着MWCNTs-OH浓度(2~8 mg·L~(-1))的增加,蚕豆的根长度增加,且■产生速率增加的同时会伴随着SOD、POD活性升高。(2)单一Cd处理的幼苗根系MDA含量和■产生速率均高于对照,其中■产生速率较对照增加了1.98倍。(3)MWCNTs-OH联合处理诱导了蚕豆根■的产生和MDA含量增加,16 mg·L~(-1) MWCNTs-OH和Cd共同作用对蚕豆幼苗根的损伤最大,会促使部分根尖细胞受损脱落,Cd含量明显下降。研究发现,低浓度MWCNTs-OH可促进蚕豆的根生长,降低Cd的毒性;高浓度MWCNTs-OH(16 mg·L~(-1))和Cd对蚕豆幼苗根的致毒性表现为协同效应。 相似文献
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99.
不同降温速率对脐血干细胞冷冻复苏后生物学特性的影响 总被引:4,自引:0,他引:4
考察了不同降温速率对脐血造血干细胞各种生物学特性的影响。在4℃~-40℃的降温范围内,分别选择-0.5℃/min, -1℃/min, -5℃/min的降温速率进行降温,对复苏后的脐血单个核细胞的回收率、活性和CD34+含量的变化以及BFU-E、CFUGM和CFU-MK集落的回收率进行了考察,发现在-1℃/min的降温速率下,脐血MNC回收率可达93.3%±1.8%,活性可达95.0%±3.9%, CD34+细胞回收率达80.0%±17.9%,BFUE回收率为87.1%±5.5%,CFUGM回收率达88.5%±8.9%,CFUMK的回收率也达到86.2%±7.4%。并且对复苏后的细胞进一步进行体外培养,发现在-1℃/min的降温速率下复苏的细胞仍然具有与未经冷冻细胞相似的扩增能力,而-0.5℃/min和-5℃/min这两种降温速率条件下复苏的细胞与未经冷冻的细胞相比差距较大。因而-1℃/min的降温速率对冻存脐血干细胞比较合适。 相似文献
100.
兔眼越桔花粉的超微结构和营养成分与其育性关系研究 总被引:1,自引:0,他引:1
运用透射电镜观察5个兔眼越桔品种的花粉结构并分别测定分析了花粉的营养成分,以探讨兔眼越桔花粉育性与其超微花粉结构和营养成分的关系.结果表明,兔眼越桔花粉结构中,内膜系统清晰可见,发育程度因品种而异.开花前的花粉细胞核仁较大,蛋白质合成旺盛.对花粉超微结构与营养成分间关系的比较分析表明:花粉细胞的全糖和脯氨酸含量与花粉发芽率呈正相关,兔眼越桔花粉壁的厚度、花粉细胞的蛋白质含量与花粉的萌发率无相关性,而内质网发育程度与蛋白质含量呈正相关趋势.推测兔眼越桔花粉细胞的全糖和脯氨酸含量对兔眼越桔花粉的发育及其育性具有密切的关系. 相似文献