操纵子

Operon containing genes that metabolize the sugar arabinose.

含有阿拉伯糖代谢基因的操纵子。

ResultsUsing this method, we successfully cloned the 11kb virB operon of Brucella and constructed complementary plasmid.

我们利用该方法克隆了布鲁氏菌中长度为11kb的virB操纵子，并构建了互补质粒。

Expression of the catabolite-regulated operons shows an inverse relationship with the level of cyclic AMP, which acts by binding to the product of cap gene.

代谢调节的操纵子的表达表现了与cAMP的一种逆转关系，它通过与cap基因产物的结合来起作用。

Used to enhance transcription of the lac and ara operon genes, which produce proteins involved in catabolism.

用于增强lac和ara操纵子基因的转录，产生的蛋白在分解代谢中起作用。

The regulatory elements of the tetracycline resistance operon of Eschenchia coli, Tet repressor and Tet operator, have served as the basis for the establishment of heterologous repression-based inducible system in many eukaryotes including yeast, plants, insects, mammals and parasitic protozoa, such as Trypanosomes, Entamoeba, Giardia, Toxoplasma, Leishmania and Trichomonas.

基于四环素抑制子(Tetracycline Repressor，TetR)和四环素操纵子(Tet Operator，TetO)相互作用的四环素可诱导转基因表达系统，已经广泛的应用于很多真核生物，包括酵母、植物、昆虫、哺乳类细胞和诸如锥虫、阿米巴、贾第虫、弓形虫、利什曼和毛滴虫的寄生原虫。

An operator is a segment of DNA which regulates the activity of the structural genes of the operon that it is linked to, by interacting with a specific repressor or activator .

操纵基因是 DNA 的一节能调控与操纵子连结的结构基因的活动，这种调控是透过独特阻遏基因或活跃基因的相互作用。

NodD binds to and bends target promoters through anchoring two tandem and individual specific DNA sites. NodD functions as a tetramer, which has a V-shaped main body. Tetrameric NodD is to change its own conformation rather than its oligomeric forms in response to small signal molecules. The specific interaction between each NodD DNA-binding domain and each specific DNA site does not alter itself in spite of naringenin induction, and the induced conformational change is transferred from protein to DNA. Only the DNA conformation incited by induced NodD is competent for RNA polymerase to form the transcriptional open complex. It cannot be excluded that NodD may have protein-to-protein contacts with RNA polymerase, and that the NodD conformational change may also directly contribute to the transcriptional open complex formation. However, the NodD conformational change itself cannot serve as the determinant of the transcriptional molecular switch.

通过研究，我们提出了初步的NodD操纵子激活模型：第一，四聚体是NodD蛋白的功能单位，它通过铆钉两个串联的相对独立的DNA靶位点结合被诱导的启动子；第二，小分子配基的结合是改变NodD四聚体的构象而不是引发不同形式的寡聚体，在我们的模型中，NodD四聚体缩小其V形主体的弯折角，进而缩短其DNA结合功能域的间距；第三，小分子信号的诱导并没有改变NodD的DNA结合域和其DNA靶位点的相互作用，NodD的构象改变由蛋白质经其双铆钉位点传递给DNA；第四，只有诱导状态的NodD激发的DNA构象才能有效地使RNA聚合酶形成转录开放复合物；第五，不排除NodD与RNA聚合酶可能有直接的相互接触位点，不排除NodD构象的改变可能直接有利于RNA聚合酶形成转录开放复合物，但是我们认为NodD构象改变本身不是充当转录激活开关的决定因素。

Attenuation The trp operon is also controlled by attenuation A leader sequence in the polycistronic mRNA upsteam of the coding region of the trpE structural gene encodes a 14 amino acid leader peptide including two tryptophan residues The RNA leader sequence can for several possible stem-loop secondary structures,one of which can act as a transcription terminator whilst a different stem-loop can act as an anti-terminator.

弱化作用 trp 操纵子也受到弱化作用的调控。在trpE结构基因编码区上游的多顺反子mRAN上有一段前导序列，可以编码一个含有14个氨基酸的前导肽，此肽中含有两个色氨酸残基。

Besides characterisation of the two genes' function, RT-PCR, Northern analysis, primer extension, and lacZ reporter gene fusions were also tried in this study to investigate the genetic organization of the operons related and their transcription regulation, map gene was found to locate at the end of a long ribosome protein genes operon and yflG is in another operon with its downstream gene.

除了对这两个基因的功能鉴定，本文还阐明了它们各自所在操纵子的遗传结构，并采用RT-PCR、Northern印迹及引物延伸等多种方法，最终分别对它们的启动子进行了定位。

Transcribed sequence just downstream of the trp operon promoter that is central to the attenuation mechanism.

紧接在trp操纵子的启动子之后转录出来的序列，对衰减作用机理很重要。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。