Elasticity of the rod-shaped Gram-negative eubacteria
Elasticity of the rod-shaped Gram-negative eubacteria
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DOI：
10.1103/physrevlett.85.5246
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发表时间：
2000-12-11
影响因子：
8.6
通讯作者：
Pink, D
中科院分区：
文献类型：
--
作者：
Boulbitch, A;Quinn, B;Pink, D
我们报告了一个理论计算的肽聚糖网络的弹性，唯一的应力承受部分杆状革兰氏阴性真细菌。肽聚糖网络由弹性肽和不可扩展的聚糖链组成，有人提出后者沿着圆柱形细菌外壳的圆周形成之字形细丝。聚糖链的之字形几何形状产生了非线性弹性行为。肽聚糖网络的四个弹性模量取决于其受力状态。对于生理条件下的细菌，弹性与细菌膨胀压力成正比。我们的结果与最近的测量结果很一致。
We report a theoretical calculation of the elasticity of the peptidoglycan network, the only stress-bearing part of rod-shaped Gram-negative eubacteria. The peptidoglycan network consists of elastic peptides and inextensible glycan strands, and it has been proposed that the latter form zigzag filaments along the circumference of the cylindrical bacterial shell. The zigzag geometry of the glycan strands gives rise to nonlinear elastic behavior. The four elastic moduli of the peptidoglycan network depend on its stressed state. For a bacterium under physiological conditions the elasticity is proportional to the bacterial turgor pressure. Our results are in good agreement with recent measurements.