Related Experiment Video
Updated: May 27, 2026
10:20
Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
Published on: September 5, 2019
Signal-pair correlation analysis of single-molecule trajectories
Armin Hoffmann1, Michael T Woodside
1Department of Physics, University of Alberta, and National Institute of Nanotechnology, NRC, Edmonton AB T6G 2M9, Canada.
Angewandte Chemie (International Ed. in English)
|November 8, 2011
Summary
This study introduces a new method to extract kinetic information from single biomolecule trajectories. The technique accurately determines kinetic schemes and rates, even for challenging states in biomolecular systems.
Area of Science:
- Biophysics
- Chemical Kinetics
- Molecular Dynamics
Background:
- Understanding the dynamics of biomolecules is crucial for deciphering their function.
- Single-molecule experiments provide high-resolution data but analyzing complex kinetic behaviors can be challenging.
- Existing methods may struggle with low-occupancy states, short-lived intermediates, or noisy data.
Purpose of the Study:
- To develop a novel method for extracting kinetic information from single biomolecule trajectories.
- To accurately determine the kinetic scheme and rate constants for complex biomolecular systems.
- To address limitations of current methods in analyzing states with low occupancy or short lifetimes.
Main Methods:
- A method based on correlating signal ranges from single biomolecule trajectories.
- Application to a three-state DNA hairpin system (Folded, Intermediate, Unfolded states).
- Analysis of overlapping states, noise, and systems with diverse rate constants.
Main Results:
- Successfully obtained kinetic information, including the kinetic scheme and rate constants.
- Demonstrated the method's capability to handle states with low occupancy and short lifetimes.
- Showcased robustness in analyzing systems with overlapping states due to noise and varying rate differences.
Conclusions:
- The developed method provides a robust approach for kinetic analysis of single biomolecule data.
- This technique enables detailed characterization of biomolecular dynamics, even under challenging experimental conditions.
- It offers a valuable tool for advancing the understanding of biomolecular mechanisms.
More Related Videos
Related Concept Videos
01:162D NMR: Overview of Homonuclear Correlation Techniques
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
COSY90 is the standard two-dimensional (2D) COSY experiment that...
01:182D NMR: Overview of Heteronuclear Correlation Techniques
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
01:13¹H NMR Signal Multiplicity: Splitting Patterns
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
01:21Tandem Mass Spectrometry
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...