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Insights into the Interactions of Amino Acids and Peptides with Inorganic Materials Using Single-Molecule Force Spectroscopy

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Peptide desorption kinetics from single molecule force spectroscopy studies.

Stefanie Krysiak¹, Susanne Liese, Roland R Netz

¹Physik Department and IMETUM, Technische Universität München , 85748 Garching, Germany.

Journal of the American Chemical Society

|December 17, 2013

Summary

This summary is machine-generated.

We determined the intrinsic monomeric desorption rate (k0) of polytyrosine and polylysine homopeptides. The study reveals a surprisingly low k0 value, indicating significant cooperativity in single polymer desorption from surfaces.

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Area of Science:

Polymer Physics
Surface Science
Biophysics

Background:

Understanding polymer desorption kinetics is crucial for surface interactions.
Previous studies lacked precise determination of intrinsic monomeric desorption rates.

Purpose of the Study:

To determine the intrinsic monomeric desorption rate (k0) of polytyrosine and polylysine homopeptides.
To investigate the influence of solvent quality on polymer desorption dynamics.

Main Methods:

Combined experimental (AFM) and theoretical (two-state kinetic polymer theory) approach.
Utilized constant-pulling-velocity and waiting-time protocols for single-molecule desorption.
Systematically varied solvent quality (ethanol, salt) to alter desorption force (10-90 pN).

Main Results:

Unambiguously determined polymer contour length (L), Kuhn length (a), adsorption free energy (λ), and intrinsic monomeric desorption rate (k0).
Measured a surprisingly low intrinsic monomeric desorption rate (k0 ≈ 10^5 Hz).
Demonstrated significant cooperativity in the desorption process of single polymers.

Conclusions:

The low k0 value suggests strong cooperative effects govern single polymer desorption.
This study provides a robust method for quantifying fundamental desorption parameters.
Findings have implications for understanding polymer behavior at interfaces.