Dependence of Work on the Pulling Speed in Mechanical Ligand Unbinding.

ABSTRACT: In single-molecule force spectroscopy, the rupture force F_max required for mechanical unfolding of a biomolecule or for pulling a ligand out of a binding site depends on the pulling speed V and, in the linear Bell-Evans regime, F_max ∼ ln(V). Recently, it has been found that non-equilibrium work W is better than F_max in describing relative ligand binding affinity, but the dependence of W on V remains unknown. In this paper, we developed an analytical theory showing that in the linear regime, W ∼ c₁ ln(V) + c₂ ln²(V), where c₁ and c₂ are constants. This quadratic dependence was also confirmed by all-at

SUBMITTER: Pham HA 

PROVIDER: S-EPMC8389893 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature