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Microcapillary tube Drummond Microcaps®

微毛细管Drummond Microcaps ®

Company: Sigma-Aldrich
Catalog#: P1424
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Identification and Characterization of Bacterial Chemoreceptors Using Quantitative Capillary and Gradient Plate Chemotaxis Assays
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2016-04-20
[Abstract]  Bacterial chemotaxis is a motility-based response that biases cell movement toward beneficial molecules, called attractants, and away from harmful molecules, also known as repellents. Since the species of the genus Pseudomonas are characterized by a metabolic versatility, these bacteria have developed chemotactic behaviors towards a wide range of different compounds. The specificity of a chemotactic response is determined by the chemoreceptor, which is at the beginning of the signaling cascade and which receives the signal input. The basic elements of a typical chemoreceptor are the periplasmic ligand binding domain (LBD), responsible for sensing environmental stimuli, and the cytosolic methyl-accepting (MA) domain, that interacts with other components of the cellular signaling cascade. Escherichia ... [摘要]  细菌趋化性是基于运动性的反应,其将细胞运动偏向有益分子,称为引诱剂,并远离有害分子,也称为驱避剂。由于假单胞菌属的种属的特征在于代谢多样性,这些细菌已经对宽范围的不同化合物产生趋化行为。趋化反应的特异性由化学感受器确定,化学感受器处于信号级联的开始并且接受信号输入。典型的化学感受器的基本元件是负责感测环境刺激的周质配体结合结构域(LBD)和与细胞信号传导级联的其它组分相互作用的细胞溶质甲基接受(MA)结构域。大肠杆菌(大肠杆菌)是趋化性研究中的传统模型,具有5个良好表征的化学感受器。然而,基因组序列分析已经揭示许多其他细菌具有更多的化学感受器,其中一些具有部分重叠的信号谱。这种高数目的化学感受器通过分析单个化学感受器突变体使他们的研究变得复杂。我们已经寻求化学受体表征的替代策略,其对应于由所研究的化学受体的LBD和E的MA结构域组成的嵌合受体的产生。大肠杆菌受体(Tar)。然后将嵌合体引入E的无化学感受器的突变体。并且所得菌株的趋化性完全是由于该嵌合受体的作用。在本公开中,我们描述了使用定量毛细管和梯度板测定来研究假单胞菌趋化性以及E。含有嵌合受体的大肠杆菌菌株。

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