Detailed Analyses of Stall Force Generation in Mycoplasma mobile Gliding.

Detailed Analyses of Stall Force Generation in Mycoplasma mobile Gliding.
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DOI:
10.1016/j.bpj.2018.01.029
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发表时间:
2018-03-27
影响因子:
3.4
通讯作者:
Miyata M
Miyata M
中科院分区:
生物学3区
文献类型:
--
作者:
Mizutani M;Tulum I;Kinosita Y;Nishizaka T;Miyata M

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移动支原体是一种细菌,它使用独特的机制以高达 4.5 μm/s 的速度在固体表面上滑动。它的滑翔机械由数百个单元组成,这些单元根据 ATP 产生的能量产生滑翔力;这些单元捕获并拉动固定在固体表面上的唾液酸化寡糖。在这项研究中,我们测量了携带使用光镊操作的珠子的野生型和突变型 M. mobile 菌株的失速力。结合增强的菌株表现出比野生型菌株更弱的失速力,表明失速力与力的产生有关,而不是与结合有关。添加 0–0.5 mM 游离唾液酸乳糖(一种唾液酸化寡糖)后,野生型菌株的失速力从 113 皮牛顿线性下降至 19 皮牛顿,同时工作单位数量也减少。添加 0.5 mM 唾液酸乳糖后,使用光镊装载珠子的细胞随着力的增加而表现出逐步运动。力增量范围为 1 到 2 皮牛顿。考虑到 70 nm 的步长,这种小单位力可能是由 M. 移动滑翔机械中涉及的大齿轮比来解释的。
Mycoplasma mobile is a bacterium that uses a unique mechanism to glide on solid surfaces at a velocity of up to 4.5 μm/s. Its gliding machinery comprises hundreds of units that generate the force for gliding based on the energy derived from ATP; the units catch and pull sialylated oligosaccharides fixed to solid surfaces. In this study, we measured the stall force of wild-type and mutant strains of M. mobile carrying a bead manipulated using optical tweezers. The strains that had been enhanced for binding exhibited weaker stall forces than the wild-type strain, indicating that stall force is related to force generation rather than to binding. The stall force of the wild-type strain decreased linearly from 113 to 19 picoNewtons after the addition of 0–0.5 mM free sialyllactose (a sialylated oligosaccharide), with a decrease in the number of working units. After the addition of 0.5 mM sialyllactose, the cells carrying a bead loaded using optical tweezers exhibited stepwise movements with force increments. The force increments ranged from 1 to 2 picoNewtons. Considering the 70-nm step size, this small-unit force may be explained by the large gear ratio involved in the M. mobile gliding machinery.
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