Conformations and cryo-force spectroscopy of spray-deposited single-strand DNA on gold.

Abstract:

:Cryo-electron microscopy can determine the structure of biological matter in vitrified liquids. However, structure alone is insufficient to understand the function of native and engineered biomolecules. So far, their mechanical properties have mainly been probed at room temperature using tens of pico-newton forces with a resolution limited by thermal fluctuations. Here we combine force spectroscopy and computer simulations in cryogenic conditions to quantify adhesion and intra-molecular properties of spray-deposited single-strand DNA oligomers on Au(111). Sub-nanometer resolution images reveal folding conformations confirmed by simulations. Lifting shows a decay of the measured stiffness with sharp dips every 0.2-0.3 nm associated with the sequential peeling and detachment of single nucleotides. A stiffness of 30-35 N m-1 per stretched repeat unit is deduced in the nano-newton range. This combined study suggests how to better control cryo-force spectroscopy of adsorbed heterogeneous (bio)polymer and to potentially enable single-base recognition in DNA strands only few nanometers long.

journal_name

Nat Commun

journal_title

Nature communications

authors

Pawlak R,Vilhena JG,Hinaut A,Meier T,Glatzel T,Baratoff A,Gnecco E,Pérez R,Meyer E

doi

10.1038/s41467-019-08531-4

subject

Has Abstract

pub_date

2019-02-08 00:00:00

pages

685

issue

1

issn

2041-1723

pii

10.1038/s41467-019-08531-4

journal_volume

10

pub_type

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