Two molecule force spectroscopy on ligand–receptor interactions

Zuo, Jiacheng; Chen, Hui; Li, Hongbin

doi:10.1039/d3nr03428c

Cited by 1 publication

(1 citation statement)

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“…However, these formulas are limited by either zero external force or a two-bond cluster. At the same time, several studies have been conducted to intensively examine the dynamic strength of adhesion clusters. − For example, in terms of theory, Friddle et al proposed a model to predict the measurement strength of a single/multiple molecular bonds. They found that the loading rate and stiffness of the loading device will significantly affect the fracture force of single-/multibond.…”

Section: Introductionmentioning

confidence: 99%

Effects of Contact Surface Shape on Dynamic Lifetime and Strength of Molecular Bond Clusters under Displacement- and Force-Controlled Loading Conditions

He,

Kou,

Cai

et al. 2024

Langmuir

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Many experimental and theoretical studies have shown that the mechanical properties of cells and the extracellular matrix can significantly affect the lifetime and strength of the adhesion clusters of molecular bonds. However, there are few studies on how the shape of the contact surface affects the lifetime and strength of the adhesion clusters of molecular bonds, especially theoretical studies in this area. An idealized model of focal adhesion is adopted, in which two rigid media are bonded together by an array of receptor–ligand bonds modeled as Hookean springs on a complex surface topography, which is described by three parameters: the surface shape factor β, the length of a single identical surface shape L, and the amplitude of surface shapes w. In this study, systematic Monte Carlo simulations of this model are conducted to study the lifetime of the molecular bond cluster under linear incremental force loading and the strength of the molecular bond cluster under linear incremental displacement loading. We find that both small surface shape amplitudes and large surface shape factors will increase the lifetime and strength of the adhesion cluster, whereas the length of a single surface shape causes oscillations in the lifetime and strength of the cluster, and this oscillation amplitude is affected by the surface shape amplitude and the factor. At the same time, we also find that the pretension in the cluster will play a dominant role in the adhesion strength under large amplitudes and small factors of surface shapes. The physical mechanisms behind these phenomena are that the changes of the length of a single surface shape, the amplitude of surface shapes, and the surface shape factor cause the changes of stress concentration in the adhesion region, bond affinity, and the number of similar affinity bonds.

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