A model of crosslink kinetics in the expanding plant cell wall: yield stress and enzyme action.
A model of crosslink kinetics in the expanding plant cell wall: yield stress and enzyme action.
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DOI：
10.1016/j.jtbi.2012.04.035
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发表时间：
2012-08-21
影响因子：
2
通讯作者：
Jensen, O. E.
中科院分区：
文献类型：
--
作者：
Dyson, R. J.;Band, L. R.;Jensen, O. E.
►我们提出了一个膨胀植物细胞壁中的交联动力学模型►产量可以通过交联断裂率对伸长的依赖性来解释。靶向交联结合的酶可以软化处于屈服前状态的壁。植物初生细胞壁是含有硬纤维素微纤丝的复合材料，所述纤维素微纤丝嵌入果胶基质内并通过半纤维素聚合物的网络交联。这种微结构赋予壁非线性各向异性的机械性能，并允许酶调节膨胀细胞生长。我们提出了一个数学模型的半纤维素交联动力学在扩大细胞壁应变增强断裂和酶介导的交联动力学。该模型预测的特征屈服行为的应力和应变率之间的关系实验中看到的，并建议如何有效的产量和延伸率的壁取决于微观结构参数和XTH和expansin家族的酶的作用。该模型表明，封装在经典的洛克哈特方程的屈服行为可以解释的交联断裂率对交联伸长率的强烈非线性依赖。该模型还证明了靶向交联结合的酶如何能够有效地软化处于屈服前状态的壁，而其屈服后的延展性主要由果胶基质决定。
► We present a model of crosslink dynamics in an expanding plant cell wall ► Yield can be explained by the dependence of crosslink breakage rate on elongation. ► Enzymes that target crosslink binding can soften the wall in its pre-yield state. The plant primary cell wall is a composite material containing stiff cellulose microfibrils that are embedded within a pectin matrix and crosslinked through a network of hemicellulose polymers. This microstructure endows the wall with nonlinear anisotropic mechanical properties and allows enzymatic regulation of expansive cell growth. We present a mathematical model of hemicellulose crosslink dynamics in an expanding cell wall incorporating strain-enhanced breakage and enzyme-mediated crosslink kinetics. The model predicts the characteristic yielding behaviour in the relationship between stress and strain-rate seen experimentally, and suggests how the effective yield and extensibility of the wall depend on microstructural parameters and on the action of enzymes of the XTH and expansin families. The model suggests that the yielding behaviour encapsulated in the classical Lockhart equation can be explained by the strongly nonlinear dependence of crosslink breakage rate on crosslink elongation. The model also demonstrates how enzymes that target crosslink binding can be effective in softening the wall in its pre-yield state, whereas its post-yield extensibility is determined primarily by the pectin matrix.
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影响因子：
3.7
作者：
Dyson, R. J.;Jensen, O. E.
通讯作者：
Jensen, O. E.
DOI：
10.1098/rspb.1988.0038
发表时间：
1988-06-22
期刊：
PROCEEDINGS OF THE ROYAL SOCIETY SERIES B-BIOLOGICAL SCIENCES
影响因子：
--
作者：
DEMBO, M;TORNEY, DC;HAMMER, D
通讯作者：
HAMMER, D
影响因子：
27.5
作者：
Abasolo, Willie;Eder, Michaela;Burgert, Ingo
通讯作者：
Burgert, Ingo
影响因子：
7.4
作者：
GREEN, PB;ERICKSON, RO;BUGGY, J
通讯作者：
BUGGY, J
影响因子：
1.7
作者：
Jarvis, Michael C.
通讯作者：
Jarvis, Michael C.