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1.
    
The promoter fragments of wheatGstA1 and potatoGst1 have been amplified by PCR, cloned and fused respectively to the minimal promoter sequence of rice actin gene (Act1)) and its 5′ untranslated leader sequence together withGUS. The constructs with 2 chimeric promoters (WGA and PGA) have been transferred into rice in order to analyze their inducibility patterns in transgenic rice plants. The results show that: WGA and PGA are both inducible by elicitors ofPyricularia oryzae in transgenic rice cells; the intron I of riceAct1 gene is important for the heterogenic expression of monocot and dicot promoter elements in rice; and theAct1 minimal promoter and its 5′ untranslated leader sequence produced low level background expression in rice.  相似文献   

2.
利用家蚕基因组mRNA和氨基酸数据库对P450基因进行搜索.结果显示:在家蚕基因组中发现77个P450基因.分别归于18个P450家族和26个亚家族,其中有9个多基因家族。3个基因家族的成员超过10个,CYP4有20个成员。是一个典型的多基因家族。对P450基因进行正选择、基因转换和基序分析。结果表明:1个组(包含3个P450s基因)中检测出了显著的正选择替换位点,在这1个组中.转换事件的次数为3次。  相似文献   

3.
要将细胞色素P450 55a1基因克隆到镰刀菌素植物超表达载体pCAMBIA1302中,构建了pCAMBIA1302-cyp55a1-gfp1植物超表达载体,以水稻日本晴为遗传转化的受体对象,通过农杆菌介导侵染方法进行了遗传转化.结果表明:成功构建了细胞色素P450 55a1基因超表达载体,获得了多个细胞色素P450 55a1基因超表达的阳性植株,并以RT-PCR技术分析了阳性植株中细胞色素P450 55a1基因的表达水平.  相似文献   

4.
    
Some phytopathogenic bacteria including Xanthomonas oryzae pv. oryzae (a rice leaf bacterial blight pathogen) and its virulent gene mutant XooM3105, Xanthomonas campestris pv. campestris, Erwinia carotovora subsp. carotovora and so on, could release active oxygen such as O2 and H2O2 by themselves. Ca2+ , NADPH and O2 concentration regulated the response. The response is sensitive to heat and proteinase. These results show that the component releasing active oxygen in the bacterial plant pathogen may involve special protein and enzyme and be secreted to culture liquid. Various components of rice tissue can significantly induce the release of active oxygen in Xan-thomonas oryzae pv. oryzae.  相似文献   

5.
重组细胞色素P450 BM-3突变酶在大肠杆菌(E.coli)BL21得到表达,利用重组菌株细胞催化吲哚合成靛蓝.考察了底物、产物、葡萄糖浓度以及pH值和温度对反应的影响.结果表明:pH 7.0—7.5,温度35℃,底物浓度0.5mmol/L为较好的反应条件.在此条件下,反应进行8h后,靛蓝产率可以达到29.43%.产物靛蓝对合成反应具有一定的抑制作用,在反应体系中加入5g/L葡萄糖,可以将产率提高到44.08%.  相似文献   

6.
细胞色素P450与农药相互作用及其机理研究   总被引:1,自引:0,他引:1  
综述了细胞色素P450的种类和功能多样性,介绍了细胞色素P450参与除草剂代谢及其作用机理.同时,简述了细胞色素P450 14DM与杀菌剂特异性作用的机制.报道了我们从抗除草剂的瑞士黑麦草中克隆CYP8181同源基因及其功能的研究,以及柑橘绿霉菌细胞色素P450 14DM基因的克隆表达.为深入研究杀菌剂作用细胞色素P450 14DM的机理从而设计以P450 14DM为特异性靶标的新型农药、以及进一步研究细胞色素P450酶系与除草剂代谢的关系打下了良好的基础.  相似文献   

7.
关于中国建立判例指导制度的思考   总被引:1,自引:0,他引:1  
判例在普通法法系国家中是一种重要的法律渊源,是法律的表现形式;民法法系国家一般不承认判例的约束力,但在法律实践中判例法实际存在。受两大法系相互融合,取长补短的影响,我国案例指导出现了判例化的倾向。鉴于我国制定法的局限性,建立判例指导制度已经非常必要,它可以带来多方面的好处,但也要注意一些问题。  相似文献   

8.
细胞程序性死亡是一种自杀性细胞死亡,乃多细胞高等生物去除有害及多余细胞之途径,为生物体正常的生长发育及功能维持所必需。本文阐述了BCL—2基因与程序性细胞死亡调控之间的关系。  相似文献   

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《科学通报(英文版)》1996,41(22):1900-1900
  相似文献   

11.
【目的】探究在自然条件下松材线虫(Bursaphelenchus xylophilus)与不同抗病力松树家系互作后,是否对松材线虫的致病力和繁殖力产生影响,并分析致病力差异明显的松材线虫虫株与松树互作后其细胞色素 P450(Cytochrome P450)家族相关基因表达是否发生变化。【方法】对前期引自日本的抗松材线虫病赤松(Pinus densiflora)和黑松(P. thunbergii)基因库松树进行田间发病状况调查,发现不同松树家系的抗病能力存在显著差异。对松树基因库中各家系枯死木取样,经松材线虫自动化分子检测后,将确定为松材线虫致死的5个赤松家系和5个黑松家系样木进行线虫分离,采用单异活体培养共获得10个松材线虫虫株,检测这些虫株的致病力和繁殖力,并收集其中4个致病力差异明显的松材线虫虫株,采用RT-qPCR技术检测其与黑松互作后的2个细胞色素P450相关基因相对表达量差异。【结果】同一地块同一树种中抗病能力越强的家系,获得的松材线虫虫株在单异活体培养下繁殖量越低,相反抗病能力越弱的家系,获得的松材线虫繁殖量越高;将各虫株接种2年生黑松发现,5个黑松家系病死木中获得的线虫虫株致病力测定结果与松树家系的抗性强弱呈正相关,其中抗病能力最强的家系34病死木中获得的松材线虫虫株JYK-34的致病力最强。而赤松家系的抗性强弱与松材线虫的致病力并不呈正相关,其中来自抗病能力较强的家系18病死木分离的松材线虫虫株JYK-18的致病力却较弱;与对照线虫相比,致病力差异明显的4个虫株与2年生黑松苗互作30 d后,它们的2个细胞色素P450相关基因BxCYP33C4和BxCYP33C9的相对表达量增长倍数与虫株的致病力强弱呈正相关,各虫株依次为JYK-34>JYK-17>JYK-18>JYK-31。【结论】松材线虫繁殖力的分化在赤松和黑松两个树种不同抗病家系中规律相同;抗性松树基因库中同一地块不同抗病力松树分离的松材线虫的致病力并非单一类型,存在致病力差异的虫株;松材线虫细胞色素P450相关基因BxCYP33C4和BxCYP33C9不仅参与松材线虫与松树的互作过程,还是松材线虫重要的致病相关基因。  相似文献   

12.
研究新型抗哮喘药川丁特罗(trantinterol)对大鼠细胞色素P450酶的影响. 大鼠连续7 d灌胃给予川丁特罗后, 测定肝微粒体中CYP450的质量摩
尔浓度和主要3种亚型CYP1A2,CYP2D6和CYP3A4活性的变化. 实验结果表明, 与对照组相比,  川丁特罗给药组的大鼠肝微粒体中CYP450的总质量摩尔浓度未受影响(P>0.05), 对主要亚型CYP1A2,CYP2D6和CYP3A4的活性也无影响(P>0.05), 表明该药物对肝微粒体中的主要代谢酶无抑制或诱导作用.  相似文献   

13.
从马氏殊母贝(P.martensif)足的SMARTcDNA文库中得到了一个与肿瘤抑制子QM基因同源的克隆,测序获得了757bp的全长cDNA序列,推测的开放阅读框位于23-673bp,编码217个氨基酸,由20种氨基酸组成,最少的为色氨酸,仅占1.4%,最多的为精氨酸,有24个,占11.1%;同GenBank数据库中查找到的马氏珠母贝(P.fucata)QM基因仅在末尾有4个氨基酸存在差异.P.fucata缺少P.mariensii在开放阅读框的第637处对应的碱基C,导致P.fucala的QM蛋白在3′端多了13个氨基酸和缺乏多聚腺苷酸加尾信号AATAAA.因而,已报道的P.fitcataQM基因很可能由于测序等原因导致在开放阅读框第637处缺失了碱基C.  相似文献   

14.
环境中的抗生素主要来源于生活污水、医疗废水以及水产养殖废水等.2013年中国抗生素总使用量约为1.62×10~5 t,其中48%为人用抗生素,其余为兽用抗生素.大量具有活性的抗生素经地表径流和城市排污管道最终积聚到河流湖泊中.这些活性物质会对水生生物产生危害,尤其是在较长的时间跨度上,这种危害会进一步扩大.文章概述了近几年基于细胞色素P450(cytochrome P450,CYP450)作为检测指标,诺氟沙星(norfloxacin,NFLX)对一些水生生物的生态毒理效应.同时介绍了NFLX对于选取的指标CYP450的影响机制,以及检测这些指标的可行性方法.  相似文献   

15.
本文根据教育学、学校体育学及比较学、决策学等有关理论知识,从东西方体育文化的发展入手,采用文献资料综述的研究方法,从宏观角度,对中国现代学校体育思想的构建进行了阐述,旨在挖掘和完善学校体育指导思想的理论体系.  相似文献   

16.
将1个从棉花中分离的新的启动子ACT E3插入质粒pBI101,ACT E3与GUS基因融合,构建成pACT E3表达载体。通过农杆菌介导转化法将ACT E3/GUS融合基因导入烟草。GUS组织化学染色分析表明,在ACT E3启动子控制下,GUS基因仅在叶片及茎等组织中特异表达。  相似文献   

17.
High mycoplasmal infection ratio in gastric cancer tissues suggests a possible association between my-coplasma infection and tumorigenesis.Because TNF-α plays an important role in carcinogenesis caused by microbes in-fection and P37 is a major immunogen of mycoplasma hy-orhinis(M.hyor.),investigating whether P37 could induce expression and secretion of TNF-α will be very significant fo elucidate the possible molecular mechanism of gastric car-cinogenesis involved with M.hyor.At the present study,we cloned full gene of p37 by PCR and mutated the 7 codes of TGA into TGG firstly,then expressed the P37 protein suc-cessfully with pGEX-4T-1 vector in E.coli,which was veri-fied with Western bolt.By RT-PCR and sensitive L929 cell toxic assay,we found that P37 protein could induce expres-sion and secretion of TNF-α from human peripheral blood mononuclear cells,and the inducing activity of P37 could be dramatically blocked by McAb PD4.These results suggest that the induction of TNF-α secretion by P37 probably plays an importan role in diseases caused by M.hyor.infection and needs to be further investigated.  相似文献   

18.
IntroductionLong chainα,ω- dicarboxylic acids (DCA ) areversatile chemical intermediates used as rawmaterials for the preparation of perfumes,polymers,and adhesives[1] .Various strains of C.tropicalis are known to produce DCA whencultured with alkanes or fatty acids as the carbonsource[2 ,3] . During aerobic and viscous fermentation,theoxygen supply is of crucial importance becauseinsufficient oxygen can lead to suboptimalproductivities[4 ] as well as products of low quality.Several meth…  相似文献   

19.
    
A noteworthy feature of the living world is its bewildering variability. A key issue in several biological disciplines is the achievement of an understanding of the hereditary basis of this variability. Two opposing, but not necessarily irreconcilable conceptions attempt to explain the underlying mechanism. The gene function paradigm postulates that phenotypic variance is generated by the polymorphism in the coding sequences of genes. However, comparisons of a great number of homologous gene and protein sequences have revealed that they predominantly remained functionally conserved even across distantly related phylogenic taxa. Alternatively, the gene regulation paradigm assumes that differences in the cis-regulatory region of genes do account for phenotype variation within species. An extension of this latter concept is that phenotypic variability is generated by the polymorphism in the overall gene expression profiles of gene networks. In other words, the activity of a particular gene is a system property determined both by the cis-regulatory sequences of the given genes and by the other genes of a gene network, whose expressions vary among individuals, too. Novel proponents of gene function paradigm claim that functional genetic variance within the coding sequences of regulatory genes is critical for the generation of morphological polymorphism. Note, however, that these developmental genes play direct regulatory roles in the control of gene expression.  相似文献   

20.
酿酒酵母(Saccharomyces cerevisiae)是一种理想的真核蛋白表达系统.将真菌细胞色素P450nor2基因亚克隆到酵母表达载体pAUR123中,构建重组表达质粒pAUR-P450nor2并转化酿酒酵母AH22,经Aureobasidin A筛选和菌落PCR鉴定得到阳性克隆.SDS-PAGE分析证实:重组的真菌细胞色素P450nor2在酵母细胞中实现了高表达.  相似文献   

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