排序方式： 共有69条查询结果，搜索用时 15 毫秒
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由CarAB、ArgD、ArgJ三个基因分别编码的氨基甲酰磷酸合成酶、乙酰鸟氨酸转氨酶、鸟氨酸乙酰基转移酶是L-精氨酸合成途径的关键酶。以谷氨酸棒杆菌ATCC14067为出发菌株,利用大肠杆菌-谷氨酸棒杆菌的穿梭质粒pEC-XK99E-p’、PEC-T18mob2,分别对精氨酸生物合成途径的关键酶基因CarAB、ArgD、ArgJ进行单个基因表达、对ArgD、ArgJ基因进行串联表达以及对CarAB、ArgD、ArgJ三个基因进行共表达,分别得到过量表达菌株14067-pEC-CarAB、14067-T18-ArgD、14067-T18-ArgJ、14067-T18-ArgDJ、14067-pEC-CarAB-T18-ArgDJ。检测上述三个基因单独表达,串联表达及共表达对L-精氨酸产量的影响。摇瓶发酵实验证明,这五株菌产精氨酸的能力较出发菌株ATCC14067分别提高了1.61、1.14、1.19、1.28、2.91倍。产量最高的共表达菌株14067-pEC-CarAB-T18-ArgDJ,通过实时荧光定量PCR检测,表明CarA、CarB、ArgD、ArgJ基因的表达量分别是ATCC14067的2.50、5.60、3.59、4.70倍。这表明过量表达基因CarAB、ArgD、ArgJ可以有效提高精氨酸的产量。 相似文献
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由ilvBN、ilvC基因编码的乙酰羟酸合成酶（AHAS）和乙酰羟酸异构还原酶（AHAIR）是L-缬氨酸合成途径的两个关键酶。本实验以黄色短杆菌Brevibacterium flavum MD515为出发菌株,通过PCR技术扩增其ilvBN和ilvC基因,对调节亚基ilvN进行定点突变,获得抗反馈抑制突变型编码基因ilvBNrC;然后将其插入穿梭表达载体pZ8-1中,构建串联表达质粒pZ8-1-ilvBNrC并转化出发菌株,筛选获得工程菌株B.flavum MD515/pZ8-1-ilvBNrC。摇瓶发酵该工程菌株L-缬氨酸产量达29.5 g·L-1,较出发菌株提高27.7%,同时生长速度和生物量也比出发菌株有所提高,丙氨酸含量降低,L-亮氨酸及L-异亮氨酸含量提高。在30 L发酵罐连续补料发酵60 h后L-缬氨酸产量达61.7 g·L-1,糖酸转化率为39.2%。菌株MD515/pZ8-1-ilvBNrC发酵液透光率较出发菌株高且蛋白含量低,这些特性有利于发酵液后期的分离提取。 相似文献
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通过共表达分子伴侣的策略提高漆酶在毕赤酵母中的产量。前期基于Pichia pastoris密码子偏好性,合成了来源于Cerrena sp. WR1的漆酶基因,克隆至pPIC9K,转化Pichia pastoris GS115,得到重组菌株PP-L。在PP-L中,分别过量表达蛋白质折叠(BIP、ERO1)、囊泡运输(SEC53、SEC1)、胁迫应激(HAC1、GCN4)相关的6种分子伴侣。结果显示,共表达这6种分子伴侣对分泌表达漆酶的菌株PP-L的正常生长没有影响;共表达BIP使重组菌胞外酶活提高359%,共表达ERO1胞外酶活反而降低22%;共表达其它4种分子伴侣对胞外酶活提高18%～53%。组合共表达BIP和HAC1的重组菌P1较PP-L胞外酶活提高了602%,酶活达到3 896 U/L。推测由于强化内质网中BIP水平进而提高了蛋白质折叠能力,从而提高其分泌效率。该研究结果将有助于发酵法生产漆酶的工业化。 相似文献
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乙肝表面抗原HBs Ag是乙肝疫苗的主要组分。从转录水平、翻译水平以及翻译后水平对其进行优化,实现了HBs Ag在重组酿酒酵母中的高效异源表达。与组成型启动子TEF1、TDH3、HXT7、ADH1相比,诱导型启动子GAL1可大幅度提高HBs Ag的表达;与GCCACC和AAAAAA相比,kozak序列TACACA最有利于HBs Ag的翻译表达;而共表达二硫键异构酶pdi对HBs Ag的活性表达具有显著的促进作用。通过3种水平的优化,HBs Ag活性从最初的8.87 IU/g提高至151.08 IU/g;最终,利用Ni柱亲和层析成功获得纯化的HBs Ag,活性为3.32 IU/m L。 相似文献
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染料脱色过氧化物酶(dye-decoloorizing peroxidase,DyP)属于以血红素为辅基的新型过氧化物酶类,常因缺乏辅因子而导致催化活性低。将来源于褐色嗜热裂孢菌(Thermobifida fusca)的染料脱色过氧化物酶基因(TfuDyP)与大肠杆菌谷氨酰-tRNA还原酶基因(hemA),构建重组质粒phemA-DyP,转化至E.coli BL21中进行共表达。分别以2,2-联氮-二(3-乙基苯并噻唑-6-磺酸)二铵盐(ABTS)和顽固性染料活性蓝19(RB19)、溴酚蓝、溴甲酚绿为底物检测TfuDyP的催化活力以及染料脱色效率。结果表明,诱导后的共表达菌株pAD胞内血红素含量为9. 8μmol/L,而单独过表达基因TfuDyP的菌株pD仅为3. 4μmol/L。TfuDyP纯酶的全波长扫描分析表明,在菌株pAD中DyP酶与血红素的结合度相比pD有较大幅度的提升。pAD菌株表达的DyP酶活力较pD菌株提高了110%,酶活力的提高使其在染料脱色应用方面也得到增强。在pAD菌株培养基中分别添加谷氨酸(Glu)、FeCl2使得胞内血红素含量、DyP酶活力和染料脱色效率比未添加时进一步提高。以上结果为TfuDyP的功能开发奠定了基础,同时也为其他血红素依赖性过氧化物酶的研发提供借鉴。 相似文献
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Ferritin is an iron storage protein found in most living organisms. Human heavy chain (H-) and light chain (L-) ferritin were amplified from human heart cDNA library. Each ferritin gene was inserted down stream of the T7 promoter of bacterial expression, and finally four types of H-, L-, and co-expression vectors were constructed. Recombinant human ferritins were overexpressed and identified with SDS-PAGE and western blotting. The expression levels of recombinant ferritin proteins ranged about 29–36% of whole cell total protein. From atomic absorption spectrometry (AAS) analysis, the rate of iron uptake for H-ferritin was significantly faster than that for the HL-, LH-, and L‐ferritin, respectively. From AAS analysis, the levels of iron content in cells progressively increased in transformants with 0–30 mM ferric citrate in the media. Among these ferritin transformants, the highest amount of cellular iron was observed with H‐ferritin transformant. The total amounts of iron content in E. coli could be sequentially ranked as H-ferritin > HL-ferritin > LH-ferritin > L-ferritin > negative transformants. Expressed recombinant human ferritins indicated that their assembled subunits were able to store iron in the cells. The results of this study further enhances our understanding of iron uptake properties in vivo and suggest similar strategies for using food-grade ferritins for functional foods or iron-fortified food ingredients. 相似文献
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Francesco Monticolo Emanuela Palomba Maria Luisa Chiusano 《International journal of molecular sciences》2020,21(24)
The main hallmarks of cancer diseases are the evasion of programmed cell death, uncontrolled cell division, and the ability to invade adjacent tissues. The explosion of omics technologies offers challenging opportunities to identify molecular agents and processes that may play relevant roles in cancer. They can support comparative investigations, in one or multiple experiments, exploiting evidence from one or multiple species. Here, we analyzed gene expression data from induction of programmed cell death and stress response in Homo sapiens and compared the results with Saccharomyces cerevisiae gene expression during the response to cell death. The aim was to identify conserved candidate genes associated with Homo sapiens cell death, favored by crosslinks based on orthology relationships between the two species. We identified differentially-expressed genes, pathways that are significantly dysregulated across treatments, and characterized genes among those involved in induced cell death. We investigated on co-expression patterns and identified novel genes that were not expected to be associated with death pathways, that have a conserved pattern of expression between the two species. Finally, we analyzed the resulting list by HumanNet and identified new genes predicted to be involved in cancer. The data integration and the comparative approach between distantly-related reference species that were here exploited pave the way to novel discoveries in cancer therapy and also contribute to detect conserved genes potentially involved in programmed cell death. 相似文献
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