ArticleACS omega2025
Multiplateau Force-Extension Curves of Long Double-Stranded DNA Molecules.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
When highly stretched, double-stranded DNA exhibits a plateau region in its force-extension curve. Using a bead-spring coarse-grained dynamic model based on a nonconvex potential, we predict that a long double-stranded DNA fragment made of several consecutive segments with substantially different plateau force values for each segment will exhibit multiple distinct plateau regions in the force-extension curve under physiologically relevant solvent conditions. For example, a long composite double-stranded (ds) DNA fragment consisting of two equal-length segments characterized by two different plateau force values, such as the poly(dA-dT)-poly(dG-dC) fragment, is predicted to exhibit two distinct plateau regions in its force-extension curve; a long composite dsDNA fragment consisting of three segments having three different plateau force values is predicted to have three distinct plateau regions. The formation of mixed states of slightly and highly stretched DNA, coexisting with macroscopically distinct phases of uniformly stretched DNA is also predicted. When one of the segments overstretches, the extensions of the segments can differ drastically. For example, for the poly(dA-dT)-poly(dG-dC) composite fragment, in the middle of the first plateau, 96.7% of the total extension of the fragment (relative to
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