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Related Concept Videos

Enzymes02:34

Enzymes

81.1K
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
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Enzyme Kinetics01:19

Enzyme Kinetics

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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
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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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Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...
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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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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.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Enzyme Inhibition01:30

Enzyme Inhibition

78.1K
Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
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Updated: Jun 13, 2025

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

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Enzyme Activity Regulates Substrate Diffusion by Modulating Viscosity in Crowded Milieu.

Alessandro Bevilacqua, Mauricio Rios Maciel, Mark V Sullivan

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    Summary
    This summary is machine-generated.

    Enzymes alter the viscosity of their crowded cellular environment, enhancing substrate access and metabolic efficiency. This enzyme-viscosity coupling reveals how cellular microenvironments impact enzyme function.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Biophysics

    Background:

    • Enzyme kinetics are classically studied in dilute solutions, but cellular environments are crowded.
    • Understanding enzyme behavior in native, crowded conditions is crucial for cellular metabolism.
    • Liquid-liquid phase separation (LLPS) offers a model for studying enzymes in crowded microenvironments.

    Purpose of the Study:

    • To investigate how enzymes affect their surrounding microenvironment's physical properties.
    • To explore the impact of enzyme activity on viscosity and substrate mobility within crowded droplets.
    • To elucidate the mechanism of enzyme-viscosity coupling in a biomimetic system.

    Main Methods:

    • Utilized liquid-liquid phase separation (LLPS) to create controlled in vitro droplets mimicking cytosolic crowding.
    • Employed fluorescence microscopy, bulk shear rheometry, and microrheology to analyze viscosity changes.
    • Investigated dynamic interactions between substrate, product, and protein crowders.

    Main Results:

    • Enzymatic activity was shown to alter the shear viscosity of both protein-rich and PEG-rich phases within the droplets.
    • This viscosity modification enhances substrate mobility and improves substrate access to enzyme catalytic sites.
    • Demonstrated a feedback mechanism where enzymes influence their physical environment and macromolecular organization.

    Conclusions:

    • Enzyme activity dynamically modulates the viscosity of the cellular microenvironment.
    • This enzyme-viscosity coupling is a key factor in regulating substrate availability and enzyme function in crowded cellular conditions.
    • Findings provide novel insights into the interplay between enzymes, their physical surroundings, and cellular metabolism.