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首页> 外文期刊>Archives of microbiology >Escherichia coli modulates its motor speed on sensing an attractant
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Escherichia coli modulates its motor speed on sensing an attractant

机译：大肠杆菌在感测引诱剂时调节其电动机速度

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摘要

It is well known that Escherichia coli achieves chemotaxis by modulating the bias of the flagellar motor. Recent experiments have shown that the bacteria vary their swimming speeds as well in presence of attractants. However, this increase in the swimming speed in response to the attractants has not been correlated with the increase in the flagellar motor speed. Using flickering dark-field microscopy, we measure the head-rotation speed of a large population of cells to correlate it with the flagellar motor speed. Experiments performed with wild-type and trg-deletion mutant strains suggest that the cells are capable of modulating the flagellar motor speed via mere sensing of a ligand. The motor speed can be further correlated with the swimming speed of the cells and was found to be linear. These results suggest the existence of a hitherto unknown intra-cellular pathway that modulates the flagellar motor speed in response to sensing of chemicals, thereby making chemotaxis more efficient than previously known.
机译：众所周知，大肠杆菌通过调节鞭毛运动的偏向来实现趋化性。最近的实验表明，细菌在引诱剂存在下也会改变其游泳速度。然而，响应引诱剂的游泳速度的这种增加与鞭毛马达速度的增加没有关联。使用闪烁的暗场显微镜，我们测量了大量细胞的头部旋转速度，以使其与鞭毛运动速度相关。使用野生型和trg缺失突变株进行的实验表明，这些细胞仅通过检测配体就能调节鞭毛运动速度。马达速度可以进一步与细胞的游泳速度相关，并且被发现是线性的。这些结果表明存在迄今未知的细胞内途径，其响应化学物质的感应而调节鞭毛运动速度，从而使趋化作用比以前已知的更有效。

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