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从毛萼香茶菜的叶的甲醇提取物中分离得到两个二萜化合物,coetsoidinA和毛萼晶P,它是目前从香茶菜属分离到的仅有的两个B环具有α,β-不饱和酮结构的对映-贝壳杉烷型二萜事物,其中毛萼晶P为新化合物 相似文献
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毛萼香茶菜中的三个新的对映—贝壳杉烷型二萜 总被引:6,自引:0,他引:6
从采自云南省江川县的毛萼香茶菜的甲醇提取物中分离得到3个新的6,7-螺断-对映-贝壳杉烷型二萜;表毛萼甲素,毛萼晶N和毛萼晶O,同时还分离到2个已知化合物,毛萼甲素及毛萼晶L,并修正了毛萼甲素的结构。 相似文献
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毛萼香茶菜的新二萜化合物,毛萼晶甲-戊的结构 总被引:1,自引:0,他引:1
香茶菜属(Rabdosia)植物中的二萜化合物具有多种生理活性,如抗肿瘤,抗菌,抑制线粒体的吸呼作用和昆虫的生长等。在我们研究该属植物生理活性成分的课题中,我们从云南省丽江县蟠龙公社金沙江河谷地区产毛萼香茶菜〔Rabdosia eriocalyx(Dunn)Hara〕叶的乙醇提取物中分得七个结晶化合物,其中五个为新化合物,命名为毛萼晶甲一戊(maoecrystal A-E),另外两个为已知化合物毛萼甲素(eriocalyxinA)和乙素(eriocalyxin B)。 相似文献
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从毛萼香茶菜中分得8个二萜,3-乙酰毛萼结晶S、毛萼结晶甲、毛萼结晶乙、毛萼结晶丙、毛萼结晶丁、trichrokaurin、edonicin和eriocalyxin B。其中3-乙酰毛萼结晶S为新的对映-贝壳杉烷型二萜。由波谱法确定其结构。 相似文献
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从昆明产腺花香茶菜(Isodon adenanthus (Diels) Kudo)的地上部分分离到8个化合物,通过波谱分析鉴定,化合物1-3为新的对映-贝壳杉烯类二萜化合物,命名为腺花香茶菜素N、0和P;4个已知二萜为白叶香茶菜戊素(4)、无毛狭叶香茶菜素C(5)、腺花香茶菜甲素(6)和白叶香茶菜乙素(7),同时得到一个高度不饱和脂肪酸9,16-二羰基-10,12,14-三烯-十八碳酸(8)。根据ROESY波谱,对化合物4的结构进行了修正。化合物1对K562细胞显示出明显的细胞毒活性(IC50=0.45μg/mL)。 相似文献
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从昆明产腺花香茶菜(Isodon adenanthus(Diels)Kudo)的地上部分分离到8个化合物,通过波谱分析鉴定,化合物1~3为新的对映-贝壳杉烯类二萜化合物,命名为腺花香茶菜素N、O和P;4个已知二萜为白叶香茶菜戊素(4)、无毛狭叶香茶菜素C(5)、腺花香茶菜甲素(6)和白叶香茶菜乙素(7),同时得到一个高度不饱和脂肪酸9,16-二羰基-10,12,14-三烯-十八碳酸(8).根据ROESY波谱,对化合物4的结构进行了修正.化合物1对K562细胞显示出明显的细胞毒活性(IC50=0.45 μg/mL). 相似文献
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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases 相似文献
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Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme
responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare
the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show
that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by
distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of
demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least
one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of
the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable
potent antiproliferative synthetic drugs. 相似文献
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The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle. 相似文献
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Meng Miao Gang Deng Xiaobei Xiong Yang Qiu Wenda Huang Meng Yuan Fei Yu Shimei Bai Xi Zhou Xiaolu Zhao 《中国病毒学》2022,37(2):314-317
Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions. 相似文献
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions. 相似文献
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Dong Liu Xin Wang Yisong Wang Peigang Wang Dongying Fan Sichang Chen Yuguang Guan Tianfu Li Jing An Guoming Luan 《中国病毒学》2018,33(5):402-409
Rasmussen’s encephalitis (RE) is a rare pediatric neurological disorder, and the exact etiology is not clear. Viral infection may be involved in the pathogenesis of RE, but conflicting results have reported. In this study, we evaluated the expression of both Epstein-Barr virus (EBV) and human herpes virus (HHV) 6 antigens in brain sections from 30 patients with RE and 16 control individuals by immunohistochemistry. In the RE group, EBV and HHV6 antigens were detected in 56.7% (17/30) and 50% (15/30) of individuals, respectively. In contrast, no detectable EBV and HHV6 antigen expression was found in brain tissues of the control group. The co-expression of EBV and HHV6 was detected in 20.0% (6/30) of individuals. In particular, a 4-year-old boy had a typical clinical course, including a medical history of viral encephalitis, intractable epilepsy, and hemispheric atrophy. The co-expression of EBV and HHV6 was detected in neurons and astrocytes in the brain tissue, accompanied by a high frequency of CD8+ T cells. Our results suggest that EBV and HHV6 infection and the activation of CD8+ T cells are involved in the pathogenesis of RE. 相似文献
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Shen Jia-Yuan Li Man Xie Lyu Mao Jia-Rong Zhou Hong-Ning Wang Pei-Gang Jiang Jin-Yong An Jing 《中国病毒学》2021,36(1):145-148
正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016). 相似文献
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Renfei Lu Xiuming Wu Zhenzhou Wan Yingxue Li Lulu Zuo Jianru Qin Xia Jin Chiyu Zhang 《中国病毒学》2020,35(3):344-347
In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans. 相似文献