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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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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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Diffusion01:12

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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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The Equilibrium Binding Constant and Binding Strength02:18

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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Ligand Diffusion on Protein Surface Observed in Molecular Dynamics Simulation.

Dmitry Nerukh1, Noriaki Okimoto2, Atsushi Suenaga

  • 1†Nonlinearity and Complexity Research Group, Aston University, Birmingham, B4 7ET, U.K.

The Journal of Physical Chemistry Letters
|August 21, 2015
PubMed
Summary
This summary is machine-generated.

Small ligands find their targets on dihydrofolate reductase protein through surface diffusion. This nonspecific binding mechanism is crucial for effective protein-ligand interactions and binding kinetics.

Keywords:
Mycobacterium tuberculosis dihydrofolate reductasebinding ratefacilitated bindingprotein ligand bindingsmall ligand bindingsurface diffusion

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Area of Science:

  • Biochemistry
  • Computational Biology
  • Molecular Dynamics

Background:

  • Dihydrofolate reductase (DHFR) is a key enzyme in folate metabolism.
  • Understanding ligand binding to DHFR is crucial for drug development.
  • Previous hypotheses suggested surface diffusion but lacked explicit confirmation in realistic systems.

Purpose of the Study:

  • To investigate the binding mechanism of small ligands to dihydrofolate reductase.
  • To confirm the role of surface diffusion in ligand-protein interactions.
  • To elucidate the contribution of nonspecific binding to overall binding kinetics.

Main Methods:

  • All-atom molecular dynamics simulations were employed.
  • The simulations focused on the interaction between small ligands and DHFR protein.
  • Analysis centered on identifying and characterizing ligand diffusion pathways on the protein surface.

Main Results:

  • Explicit confirmation of a ligand search mechanism involving surface diffusion was achieved.
  • The strength of nonspecific binding interactions was estimated.
  • Nonspecific binding was identified as essential for facilitating ligand binding kinetics.

Conclusions:

  • Ligand binding to DHFR is facilitated by diffusion along the protein surface.
  • This surface diffusion mechanism plays a critical role in the kinetics of protein-ligand association.
  • The findings provide a more complete understanding of molecular recognition processes in biological systems.