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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Passive Diffusion: Overview and Kinetics01:17

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

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Single-Molecule Reaction-Diffusion.

Lance W Q Xu 徐伟青1,2, Sina Jazani3, Zeliha Kilic4

  • 1Center for Biological Physics, Arizona State University, Tempe, AZ 85287, USA.

Biorxiv : the Preprint Server for Biology
|September 21, 2023
PubMed
Summary
This summary is machine-generated.

We developed a new single-molecule reaction-diffusion (smRD) method to track protein interactions at the molecular level. This technique provides precise kinetic data without surface confinement, offering a significant advancement over traditional methods.

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Area of Science:

  • Biophysics
  • Single-molecule spectroscopy
  • Protein dynamics

Background:

  • Studying molecular interactions in solution is crucial for understanding biological processes.
  • Traditional methods like fluorescence correlation spectroscopy often yield averaged, bulk results.
  • Analyzing reaction-diffusion dynamics at the single-molecule level offers unprecedented detail.

Purpose of the Study:

  • To develop a novel method for capturing reaction-diffusion dynamics on a molecule-by-molecule basis.
  • To analyze the interactions of intrinsically disordered human proteins, linker histone H1.0 and prothymosin .
  • To provide a method that reveals single-molecule properties without surface confinement.

Main Methods:

  • Developed a Bayesian framework for single-molecule reaction-diffusion (smRD), termed Bayes-smRD.
  • Utilized individual photon arrival times from a confocal spot to capture dynamics.
  • Analyzed spatial positions and conformational/photophysical state changes of diffusing molecules.

Main Results:

  • Successfully applied Bayes-smRD to intrinsically disordered human proteins (histone H1.0 and prothymosin ).
  • Observed the formation of larger ternary complexes on millisecond timescales.
  • Demonstrated that Bayes-smRD requires significantly less data (2-3 orders of magnitude) than fluorescence correlation spectroscopy.
  • Reduced sample photodamage due to lower data requirements.

Conclusions:

  • Bayes-smRD enables the study of reaction-diffusion at the single-molecule level with high precision.
  • The method overcomes limitations of bulk analysis and surface confinement.
  • Bayes-smRD offers a powerful tool for characterizing molecular interactions and dynamics with reduced data and photodamage.