Hsp/Hsc70相互作用蛋白CHIP在大鼠肾纤维化组织中的高表达

利用DNA重组技术 ,将编码人Hsp Hsc70相互作用蛋白CHIP(carboxylterminusofHsc 70 interactingprotein ,CHIP)全长、N端TPR及C端U box结构域的DNA片段分别构建于融合表达质粒pGEX 5X 1中 ,转化大肠杆菌 .纯化GST CHIP融合蛋白 ,制备了特异性识别人、小鼠及大鼠组织细胞内CHIP蛋白的多克隆抗体 .利用该抗体 ,对多种组织、细胞的内源性CHIP蛋白进行了检测 .发现在肾组织中 ,CHIP主要表达于皮质、髓质小管上皮细胞的胞浆中 ,且在单侧结扎输尿管所至的大鼠肾纤维化模型 (UUO)组织中 ,CHIP的表达较假手术组有显著增强趋势     

Telomere and telomerase in oncology

Telomere and cell replicative senescenceTelomeres, which are located at the end of chro-mosome, are crucial to protect chromosome againstdegeneration, rearrangment and end to end fusion[1].Human telomeres are tandemly repeated units of thehexanucleotide TTAGGG. The estimated length oftelomeric DNA varies from 2 to 20 kilo base pairs,depending on factors such as tissue type and hu-man age. The buck of telomeric DNA is double-stranded, but the end of telomeric DNA consists of3' overhang of…     

抗大麦黄矮病的小偃麦易位系的创制与鉴定

抗大麦黄矮病的小偃麦易位系的创制与鉴定@辛志勇$中国农业科学院作物育种载培研究所!北京100081@张增燕$中国农业科学院作物育种载培研究所!北京100081@陈孝$中国农业科学院作物育种载培研究所!北京100081@林志珊$中国农业科学院作物育种载培研究所!北京100081大麦;;小偃麦;;易位系     

骨膜游离移植修复犬股骨颈骨折

目的　探讨犬自体髂骨骨膜游离移植治疗股骨颈骨折的效果。方法　选用毕格犬 7只 ,共 14个髋关节 ,制成股骨颈骨折模型 ,骨折经螺钉固定后 ,取髂骨骨膜移植于骨折处。于术后 1个月和 3个月X线拍片并取髋关节标本观察。结果　术后 1个月 :X线见骨折线模糊 ;肉眼观察 :移植的骨膜与股骨颈生长在一起 ;镜下观察 :骨膜内毛细血管大量增生 ,大量类骨质及软骨细胞生成。术后 3个月 :X线见骨折愈合 ;肉眼观察 :骨膜移植处有大量骨组织生长 ,填满了骨折端 ;镜下 :骨膜内血管网非常丰富 ,大量骨细胞生成 ,新生骨小梁深入到股骨颈原有骨小梁中并与之融合。结论　犬自体髂骨骨膜游离移植可以成活和成骨 ,能重建股骨颈血运 ,促进骨折愈合。     

人类GABARAPL2基因的亚细胞定位

为了对GABARAPL2（GABAA受体相关蛋白相似蛋白2）基因的功能进行初步分析,首先通过同源比较的方法将序列与其同源物进行比较,发现GABARAPL2的氨基酸序列与GABARAP（GABAA受体相关蛋白）高度同源,而GABARAP已证实通过结合细胞骨架的微蛋白,使GABAA受体聚集,定位在细胞膜上,本文采用PCR法从人脑组织的cDNA文库中扩增出GABARAPL2的cDNA,克隆至T质粒载体中进行测序验证,然后以此为模板引物中引入酶切位点再次PCR,扩增出GABARAPL2的开放阅读框,并将其插入到加强型绿色荧光蛋白融合表达载体EGFP中,将绿色荧光蛋白标记的GABARAPL2和GABARAP分别转染HLF细胞株,结果两种蛋白的分布情况基本一致,在细胞质内和核内均有分布,而且核内的分布较胞质为多,结构功能域分析表明,GABARAPL2含有蛋白激酶C磷酸化位点和酪氨酸激酶磷酸化位点,可能通过磷酸化参与细胞骨架的变化,结论 GABARAPL2和GABARAP不仅在胞质中作为受体相关蛋白协助受体的聚集、定位,还参与体内许多其它重要的生理过程。     

Global Validation of a Process-Based Model on Vegetation Gross Primary Production Using Eddy Covariance Observations

Gross Primary Production (GPP) is the largest flux in the global carbon cycle. However, large uncertainties in current global estimations persist. In this study, we examined the performance of a process-based model (Integrated BIosphere Simulator, IBIS) at 62 eddy covariance sites around the world. Our results indicated that the IBIS model explained 60% of the observed variation in daily GPP at all validation sites. Comparison with a satellite-based vegetation model (Eddy Covariance-Light Use Efficiency, EC-LUE) revealed that the IBIS simulations yielded comparable GPP results as the EC-LUE model. Global mean GPP estimated by the IBIS model was 107.50±1.37 Pg C year⁻¹ (mean value ± standard deviation) across the vegetated area for the period 2000–2006, consistent with the results of the EC-LUE model (109.39±1.48 Pg C year⁻¹). To evaluate the uncertainty introduced by the parameter V_cmax, which represents the maximum photosynthetic capacity, we inversed V_cmax using Markov Chain-Monte Carlo (MCMC) procedures. Using the inversed V_cmax values, the simulated global GPP increased by 16.5 Pg C year⁻¹, indicating that IBIS model is sensitive to V_cmax, and large uncertainty exists in model parameterization.     

Characterization of the SARS‐CoV‐2 E Protein: Sequence,Structure, Viroporin,and Inhibitors

The COVID‐19 epidemic is one of the most influential epidemics in history. Understanding the impact of coronaviruses (CoVs) on host cells is very important for disease treatment. The SARS‐CoV‐2 envelope (E) protein is a small structural protein involved in many aspects of the viral life cycle. The E protein promotes the packaging and reproduction of the virus, and deletion of this protein weakens or even abolishes the virulence. This review aims to establish new knowledge by combining recent advances in the study of the SARS‐CoV‐2 E protein and by comparing it with the SARS‐CoV E protein. The E protein amino acid sequence, structure, self‐assembly characteristics, viroporin mechanisms and inhibitors are summarized and analyzed herein. Although the mechanisms of the SARS‐CoV‐2 and SARS‐CoV E proteins are similar in many respects, specific studies on the SARS‐CoV‐2 E protein, for both monomers and oligomers, are still lacking. A comprehensive understanding of this protein should prompt further studies on the design and characterization of effective targeted therapeutic measures.     

广西植物新资料

广西涠洲岛是中国第一大火山岛,现为国家级海洋公园。经过两次的实地调查,采集到标本共348号。整理后发现:2个新记录属,即细穗草属(Lepturus)和蒭雷草属(Thuarea);6个新记录种,即疏花木蓝(Indigofera colutea)、滨豇豆(Vigna marina)、留萼木(Blachia pentzii)、滨海白绒草(Leucas chinensis)、细穗草(Lepturus repens)、蒭雷草(Thuarea involuta)。这些都是适应沿海生境的种类。这些新记录种的发现不仅丰富了广西的植物多样性资料,而且为沿海地区的生态修复提供了参考。     

circRNAs在植物中的研究进展

circular RNA(circRNA)是一类具有闭合环状结构的内源性非编码RNA,广泛存在于多种真核生物中,具有结构稳定、序列保守、表达特异性等特征。研究表明circRNAs可作为海绵(sponge)吸附microRNA(miRNA)并参与其表达调控过程,也可通过与蛋白互作调控基因表达等生物过程;发现circRNAs不仅参与植物激素信号转导等生理过程,而且还能在植物响应逆境胁迫中起到重要作用。该文主要对近年来国内外有关circRNAs的类型、形成机制、功能及其在植物生长发育过程中的研究进展进行了综述,并讨论了circRNAs的研究意义及存在的问题,为进一步研究circRNAs在植物中的作用机制及其基因调控网络提供参考。